bq2084-V140 SLUS664B JULY 2005 REVISED AUGUST 2006 www.ti.co
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bq2084-V140
SLUS664B JULY 2005 REVISED AUGUST 2006
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v1.1-COMPLIANT GAUGE WITH bq29312
FEATURES
Provides Accurate Measurement Available Charge Li-Ion Li-Polymer Batteries Supports Smart Battery Specification (SBS) V1.1 Integrated Time Base Removes Need External Crystal with Optional Crystal input Works With bq29312 Analog Front-End (AFE) Protection Provide Complete Pack Electronics 7.2-V, 10.8-V 14.4-V Battery Packs With External Components Based Powerful Low-Power RISC Core With High-Performance Peripherals Integrated Flash Memory Eliminates Need External Configuration EEPROM Uses 16-Bit Delta Sigma Converter Accurate Voltage Temperature Measurements Measures Charge Flow Using High Resolution 16-Bit Integrating Converter Better Than 0.65-nVh Resolution Self-Calibrating Offset Error Less Than 1-µV Programmable Cell Modeling Maximum Battery Fuel Gauge Accuracy Drives 5-Segment Display Remaining Capacity Indication Available 38-Pin TSSOP (DBT) Package
DESCRIPTION
bq2084-V140 SBS-compliant gauge battery pack in-system installation maintains accurate record available charge Li-ion Li-polymer batteries. bq2084-V140 monitors capacity other critical parameters battery pack reports information system host controller over serial communication bus. designed work with bq29312 protection maximize functionality safety minimize component count cost smart battery circuits. Using information from bq2084-V140, host controller manage remaining battery power extend system time much possible. bq2084-V140 uses integrating converter with continuous sampling measurement battery charge discharge currents. Optimized coulomb counting portable applications, self-calibrating integrating converter resolution better than 0.65-nVh offset measurement error less than 1-µV (typical). voltage temperature reporting, bq2084-V140 uses 16-bit A-to-D converter. With bq29312, onboard also monitors pack individual cell voltages battery pack allows bq2084-V140 generate control signals necessary implement cell balancing required safety protection Li-ion Li-polymer battery chemistries. bq2084-V140 supports Smart Battery Data (SBData) commands charge-control functions. communicates data using System Management (SMBus) 2-wire protocol. data available include battery's remaining capacity, temperature, voltage, current, remaining run-time predictions. bq2084-V140 provides drivers pushbutton input depict remaining battery capacity from full empty 20%, 25%, increments with 5-segment display.
APPLICATIONS
Notebook Medical Test Equipment Portable Instrumentation
Please aware that important notice concerning availability, standard warranty, critical applications Texas Instruments semiconductor products disclaimers thereto appears this data sheet.
PRODUCTION DATA information current publication date. Products conform specifications terms Texas Instruments standard warranty. Production processing does necessarily include testing parameters.
Copyright 2005-2006, Texas Instruments Incorporated
bq2084-V140
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SLUS664B JULY 2005 REVISED AUGUST 2006
These devices have limited built-in protection. leads should shorted together device placed conductive foam during storage handling prevent electrostatic damage gates.
DESCRIPTION (CONTINUED)
bq2084-V140 contains bytes internal data flash memory, which store configuration information. information includes nominal capacity voltage, self-discharge rate, rate compensation factors, other programmable cell-modeling factors used accurately adjust remaining capacity use-conditions based time, rate, temperature. bq2084-V140 also automatically calibrates learns true battery capacity course discharge cycle from programmable near full near empty levels. bq29312 analog front-end (AFE) protection used maximize functionality safety minimize component count cost smart battery circuits. bq29312 protection provides power bq2084-V140 from 4-series Li-ion cell stack, eliminating need external regulator circuit. ORDERING INFORMATION
-20°C 85°C PACKAGE 38-PIN TSSOP (DBT) 36-PIN (RTT) bq2084RTT-V140 bq2084DBT-V140
most current package ordering information, Package Option Addendum this document, site www.ti.com. bq2084DBT-V140 available tape reel. suffix device type (e.g., bq2084DBTR-V140) order tape reel version. bq2084RTT-V140 available tape reel only. suffix device type (e.g., bq2084RTTT-V140) order mini tape reel version.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted
UNIT Supply voltage range, relative
-0.3 -0.3 -0.3 -20°C 85°C -65°C 150°C
Open-drain pins, V(IOD) relative Input voltage range other pins, relative Tstg Operating free-air temperature range Storage temperature range
Stresses beyond those listed under absolute maximum ratings cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated under recommended operating conditions implied. Exposure absolute-maximum-rated conditions extended periods affect device reliability. refers common node V(SSA), V(SSD), V(SSP).
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ELECTRICAL CHARACTERISTICS
-20°C 85°C unless otherwise noted
PARAMETER I(SLP) Supply voltage Operating mode current Low-power storage mode current Output voltage SMBC, SMBD, SDATA, SCLK, SAFE, LED1-LED5 Input voltage SMBC, SMBD, SDATA, SCLK, EVENT, PRES, PFIN DISP V(AI1) V(AI2) Z(AI1) Z(AI2) VIT+ Vhys Input voltage high SMBC, SMBD, SDATA, SCLK, EVENT, PRES, PFIN DISP Input voltage range VIN, Input voltage range SR1, Input impedance SR1, Input impedance VIN, Negative-going voltage input Power-on reset hysteresis
POWER RESET BEHAVIOR FREE-AIR TEMPERATURE
2.50 2.45 2.40 2.35 2.30 2.25 2.20 2.15 2.10 Vhys VIT140 Free-Air Temperature Hysterisis Voltage
TEST CONDITIONS VDDA VDDD flash programming LEDs active Sleep mode
UNIT
-0.3 -0.3 0.25 0.25
-0.25 0.25
POWER-ON RESET
INTEGRATING CHARACTERISTICS
-20°C 85°C unless otherwise noted
PARAMETER V(SR) V(SROS) Input voltage range, V(SR2) V(SR1) Input offset Integral nonlinearity error FAST -0.1 Vref TEST CONDITIONS V(SR2)- V(SR1) -0.25 0.004% 0.018% 0.25 UNIT
SWITCHING CHARACTERISTICS
-20°C 85°C unless otherwise noted
PARAMETER t(SP) Start-up time
Negative Going Input Threshold Voltage
TEST CONDITIONS ±0.5% frequency error
UNIT
frequency error measured from trimmed frequency internal system clock, which oscillator frequency, nominally 4.194 MHz. Submit Documentation Feedback
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OSCILLATOR
-20°C 85°C (unless otherwise noted) (TYP: 25°C)
PARAMETER f(eio) f(dio) f(sio) f(sxo) Frequency error from 32.768 Frequency drift TEST CONDITIONS ROSC 100k XCK1 XTAL ROSC 100k, 50°C ROSC 100k XCK1 XTAL -0.25% 0.5% 0.25% UNIT
Start-up time
frequency drift measured from trimmed frequency 25°C. start-up time defined time takes oscillator output frequency
DATA FLASH MEMORY CHARACTERISTICS
-20°C 85°C unless otherwise noted
PARAMETER t(WORDPROG) I(DDPROG) Data retention Flash programming write-cycles Word programming time Flash-write supply current
TEST CONDITIONS
UNIT Years Cycles
Specified design. production tested.
REGISTER BACKUP
PARAMETER I(RBI) V(RBI) data-retention input current data-retention voltage
TEST CONDITIONS VRBI
UNIT
Specified design. production tested.
SMBus TIMING SPECIFICATIONS
-20°C 85°C unless otherwise noted
PARAMETER f(SMB) f(MAS) t(BUF) T(HD:STA) t(SU:STA) t(SU:STO) t(HD:DAT) tSU:DAT) t(TIMEOUT) t(LOW) t(HIGH) tLOW:SEXT) tLOW:MEXT SMBus operating frequency SMBus master clock frequency free time between start stop Hold time after (repeated) start Repeated start setup time Stop setup time Data hold time Data setup time Error signal/detect Clock period Clock high period Cumulative clock slave extend time Cumulative clock master extend time Clock/data fall time Clock/data rise time
TEST CONDITIONS Slave mode, SMBC duty cycle Master mode, clock slave extend
51.2
UNIT
Receive mode Transmit mode
1000
(VILMAX 0.15 (VIHMIN 0.15 (VILMAX- 0.15
bq2084-V140 times when clock exceeds t(TIMEOUT). t(HIGH) Max. minimum idle time. SMBC causes reset transaction involving bq2084-V140 that progress. t(LOW:SEXT) cumulative time slave device allowed extend clock cycles message from initial start stop. t(LOW:MEXT) cumulative time master device allowed extend clock cycles message from initial start stop. Submit Documentation Feedback
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SMBus TIMING DIAGRAMS
SYSTEM DIAGRAM
Discharge Charge Pre-Charge FETs
Fuse Pack bq2084 Pre-Charge Control Fail-Safe Protection Input bq29312 Drive Pre-Charge Drive
Pres
Power Management LDO, TOUT Power Mode Control Temperature Measurement TINT Error Bytes User Flash Clock Generator
Cell Balancing Drive
LDO, Therm Output Drive UVLO System Watchdog
Delay Counters
Cell Balancing Algorithm Control SMBus v1.1 Data System Interface System Interface Registers
bq29312 RAM/Comms Validation Level Protection Pack Under Voltage Power Mode Control Level Protection Cell Pack Voltage Measurement
Power Mode Control
2-Tier Overcurrent Protection Voltage Level Translator
Capacity Prediction Error
Pack Sense Resistor
Level Overvoltage Protection
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ASSIGNMENTS
SMBC VSSD SAFE
(RTT) (TOP VIEW)
SDATA VDDD SCLK
VSSA PRES SCLK VDDD SDATA VSSD SAFE SMBC SMBD DISP PFIN VSSD
VSSD CLKOUT XCK1/VSSA XCK2/ROSC FILT VDDA
LED3
PRES
TSSOP (DBT) (TOP VIEW)
SMBD DISP PFIN VSSD LED5 LED4
VSSD VSSD CLKOUT XCK1 VSSA
VSSA
LED2
VSSA MRST EVENT LED1 LED2 LED3 LED4 LED5
LED1 XCK2 ROSC EVENT MRST VSSA VSSA VDDA FILT
Terminal Functions
TERMINAL NAME DISP CLKOUT FILT EVENT LED1 LED2 LED3 LED4 LED5 MRST PFIN PRES SAFE SCLK SDATA SMBC TSSOP Master reset input that forces device into reset when held high connection Active input detect secondary protector output status Active input sense system insertion Output pull PRES detection Register backup that provides backup potential bq2084-V140 data registers during periods operating voltage. accepts storage capacitor battery input. Active output additional level safety protection; e.g., fuse blow. Communication clock bq29312 Data transfer from bq29312 SMBus clock open-drain bidirectional used clock data transfer from bq2084-V140 display segments that each drive external DESCRIPTION Display control drivers LED1 through LED5 32.768-kHz output bq29312 Analog input connected external filter Input from bq29312 XALERT output
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Terminal Functions (continued)
TERMINAL NAME SMBD VDDA VDDD VSSA VSSD XCK1/VSSA XCK2/ROSC TSSOP DESCRIPTION SMBus data open-drain bidirectional used transfer address data from bq2084-V140 Connections small-value sense resistor monitor battery charge- discharge-current flow Thermistor voltage input connection monitor temperature Positive supply analog circuitry Positive supply digital circuitry pins Single-cell voltage input from bq29312 Negative supply analog circuitry Negative supply digital circuitry 32.768-kHz crystal oscillator input connected VSSA internal oscillator used 32.768-kHz crystal oscillator output connected 100-k, better resistor internal oscillator used
FUNCTIONAL DESCRIPTION OSCILLATOR FUNCTION
oscillator bq2084-V140 internal external operation. bq2084-V140 powers automatically attempts start internal oscillator, 100-k resistor connected ROSC (pin 33), then attempts start oscillator using external 32.768-kHz crystal. Either 100-k ROSC resistor 32.768-kHz crystal should mounted, both. performance internal oscillator depends tolerance 100-k resistor connected between RSOC (pin VSSA (pin 34). recommended that this resistor close bq2084-V140 possible that specification ±0.1% tolerance temperature drift better. 12-pF crystal, used, should also placed close XCK1 (pin XCK2 (pin pins possible. layout around these pins components also additional contributing factor oscillator performance degradation. average temperature drift error oscillator function over learning charge discharge cycle introduces equal capacity prediction error learned full charge capacity (FCC).
SYSTEM PRESENT OPERATION
When bq2084-V140 detects that battery inserted into system state PRES input, bq2084-V140 enters normal operating mode sets PRES PackStatus(). discharge turns within pack insertion. When pack removed from system PRES input high, then bq2084-V140 enters battery removed state turns charge discharge FETs, enables 0-V/precharging FET. Misc Config set, then PRES input left floating used.
GENERAL OPERATION
bq2084-V140 determines battery capacity monitoring amount charge input removed from rechargeable battery. addition measuring charge discharge, bq2084-V140 measures individual cell voltages, pack voltage, temperature, current, estimates battery self-discharge, monitors battery low-voltage thresholds using features bq29312 device. bq2084-V140 measures charge discharge activity monitoring voltage across small-value series sense resistor between cell stack negative terminal negative terminal battery pack. available battery charge determined monitoring this voltage correcting measurement environmental operating conditions.
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FUNCTIONAL DESCRIPTION (continued)
bq2084-V140 interfaces with bq29312 perform battery protection, cell balancing, voltage translation functions. bq2084-V140 accept thermistor (default Semitec 103AT) temperature measurement also configured internal temperature sensor. bq2084-V140 uses temperature monitor battery pack compensate self-discharge estimate.
MEASUREMENTS
bq2084-V140 uses integrating sigma-delta analog-to-digital converter (ADC) current measurement second sigma-delta individual cell battery voltage temperature measurement. individual cell pack voltages, Voltage(), Current(), AverageCurrent() Temperature() updated every during normal operation.
CHARGE DISCHARGE COUNTING
integrating measures charge discharge flow battery monitoring small-value sense resistor between pins. integrating measures bipolar signals from -0.25 0.25µV. bq2084-V140 detects charge activity when V(SR1)-V(SR2) positive discharge activity when V(SR1)-V(SR2) negative. bq2084-V140 continuously integrates signal over time, using internal counter. fundamental rate counter 0.65 nVh. bq2084-V140 updates RemainingCapacity() with charge discharge accumulated this internal counter once every second.
OFFSET CALIBRATION
bq2084-V140 provides auto-calibration feature cancel voltage offset error across maximum charge measurement accuracy. bq2084-V140 performs auto-calibration when SMBus lines stay minimum when internally connects measures internal offset. With this feature bq2084-V140 capable automatic offset calibration down
DIGITAL FILTER
bq2084-V140 does measure charge discharge counts below digital filter threshold. digital filter threshold programmed Digital Filter 0x2c should sufficiently high prevent false signal detection with charge discharge flowing through sense resistor.
VOLTAGE
While monitoring charge discharge currents, bq2084-V140 monitors individual series cell voltages through bq29312. bq2084-V140 configures bq29312 present selected cell CELL bq29312, which should connected bq2084-V140. internal bq2084-V140 then measures voltage scales appropriately. bq2084-V140 then reports Voltage() individual cell voltages VCELL1(), VCELL2(), VCELL3(), VCELL4(). additional SMBus command (0x45) returns measured Reading PACK input AFE.
CURRENT
bq2084-V140 uses inputs measure calculate battery charge discharge current. This value reported command Current(). AverageCurrent() implemented single-pole filter with 14.5-s time constant.
TEMPERATURE
input bq2084-V140 along with thermistor measures battery temperature shown schematic. bq2084-V140 reports temperature command Temperature(). bq2084-V140 also configured internal temperature sensor setting Misc Configuration 0x2a-0x2b. Data flash locations 0xb5 through 0xc0 also have changed prescribed values internal temperature sensor option selected.
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FUNCTIONAL DESCRIPTION (continued)
Table Data Flash Settings Internal External Temperature Sensor
LABEL Misc. Config Const1 Const2 Const3 Const4 Temp Temp LOCATION (Hex) (0x2a) 164/5 (0xb5/6) 166/7 (0xb7/8) 168/9 (0xb9/a) 170/1 (0xbb/c) 172/3 (0xbd/e) 174/5 (0xbf/c0) INTERNAL TEMP SENSOR SETTING (Hex) (0x0000) (0x0000) -11136 (0xd480) 5734 (0x1666) (0x0000) 5734 (0x1666) EXTERNAL TEMP SENSOR SETTING (Semitec 103AT) (Hex) -28285 (0x9183) 20848 (0x5170) -7537 (0xe28f) 4012 (0x0fac) (0x000) 4012 (0x0fac)
GAUGE OPERATION
General operational overview Figure illustrates gauge operation bq2084-V140. Table describes bq2084-V140 registers.
Figure bq2084-V140 Gauging Operational Overview bq2084-V140 accumulates measure charge discharge currents estimates self-discharge battery. bq2084-V140 compensates charge current measurement temperature state-of-charge battery. bq2084-V140 also adjusts self-discharge estimation based temperature. main charge counter RemainingCapacity() (RM) represents available capacity energy battery given time. bq2084-V140 adjusts charge, self-discharge, other compensation factors. information register accessible through SMBus interface also represented through display.
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FullChargeCapacity() (FCC) register represents last measured learned full discharge battery. used battery full-charge reference relative capacity indication. bq2084-V140 updates after battery undergoes qualified discharge from nearly full battery level. accessible through SMBus interface. Discharge Count Register (DCR) non-accessible register that tracks discharge battery. bq2084-V140 uses register update register battery undergoes qualified discharge from nearly full battery level. this way, bq2084-V140 learns true discharge capacity battery under system-use conditions. Main Gas-Gauge Registers RemainingCapacity() (RM) represents remaining capacity battery. bq2084-V140 computes units either depending selected mode. Battery Mode() (0x03) units configuration. counts during charge maximum value FullChargeCapacity() (FCC) down during discharge self-discharge minimum addition charge self-discharge compensation, bq2084-V140 calibrates three low-battery-voltage thresholds, EDV2, EDV1, EDV0 three programmable midrange thresholds VOC25, VOC50, VOC75. This provides voltage-based calibration counter. DesignCapacity (DC) user-specified battery full capacity. calculated from Pack Capacity 0x32-0x33 represented units mWh. also represents full-battery reference absolute display mode. FullChargeCapacity() (FCC) last learned measured discharge capacity battery. represented units either mWh, depending selected mode. initialization, bq2084-V140 sets value stored Full Charge Capacity 0x36-0x37. During subsequent discharges, bq2084-V140 updates with last learned measured discharge capacity battery. last learned measured discharge battery based value Discharge Count Register (DCR) after qualified discharge occurs. Once updated, bq2084-V140 writes value data flash Full Charge Capacity. represents full-battery reference relative display mode, relative state charge AtRate() calculations. Discharge Count Register (DCR) register counts during discharge, independent counts discharge activity, battery load estimation, self-discharge increments. bq2084-V140 initializes DCR, beginning discharge, when within programmed value Near Full 0x30. initial value reduced FCC/128 (bit Gauge Configuration) reduced stops counting when battery voltage reaches EDV2 threshold discharge. Capacity Learning (FCC Update) Qualified Discharge bq2084-V140 updates with amount based value qualified discharge occurs. value equals value plus programmable nearly full battery levels, according following equation: (new) (final) (initial) Measured Discharge EDV2 (FCC Battery Low%) here Battery (value stored 0x2f) 2.56 qualified discharge occurs battery discharges from Near Full EDV2 voltage threshold with following conditions: more than self-discharge battery load estimation occurs during discharge period. temperature does drop below temperature threshold programmed Learning Temp 0xac during discharge period. battery voltage reaches EDV2 threshold during discharge period, voltage greater than equal EDV2 threshold minus when bq2084-V140 detects EDV2. midrange voltage correction occurs during discharge period.
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Current remains 3C/32 when EDV2 Battery level reached. overload condition exists when EDV2 threshold reached, RM() dropped Battery Low% FCC, valid charge activity occurs during discharge period. valid charge defined uninterrupted charge into battery.
bq2084-V140 sets PackStatus() when qualified discharge begins. bq2084-V140 sets disqualifying condition occurs. cannot reduced more than increased more than during single update cycle. bq2084-V140 saves value data flash within seconds being updated. End-of-Discharge Thresholds Capacity Correction bq2084-V140 monitors battery three low-voltage thresholds, EDV0, EDV1, EDV2. thresholds programmed determination based overall pack voltage individual cell level. EDVV Pack Configuration 0x28 configures bq2084-V140 overall voltage single-cell thresholds. programmed single-cell determination, bq2084-V140 determines basis lowest single-cell voltage. Fixed thresholds must programmed EMF/EDV0 0x95-0x96, Factor/EDV1 0x97-0x98, Factor/EDV2 0x99-0x9a. CEDV Gauge Configuration 0x29 set, automatic compensated EDVs enabled bq2084-V140 computes EDV0, EDV1, EDV2 voltage thresholds based values 0x95-0xa0 battery's current discharge rate temperature. FEDV0 Gauge Configuration also then EDV0 compensated. bq2084-V140 disables detection Current( exceeds Overload Current threshold programmed 0x5b-DF 0x5c. bq2084-V140 resumes threshold detection after Current( drops below Overload Current threshold. threshold detected reset after charge detected cleared after charge. bq2084-V140 uses thresholds apply voltage-based corrections register according Table Table State-of-Charge Based Battery Voltage
THRESHOLD EDV0 EDV1 EDV2 RELATIVE STATE CHARGE Battery
bq2084-V140 performs EDV-based adjustments with Current() C/32. flags current C/32. bq2084-V140 adjusts detects each threshold. voltage threshold reached before corresponding capacity discharge, bq2084-V140 reduces appropriate amount shown Table level reached discharge before voltage reaches corresponding threshold, then held that level until threshold reached. only held indicating valid learning cycle progress. Battery zero, EDV1 EDV0 corrections disabled. Thresholds Near-Full Programming bq2084-V140 uses values stored data flash EDV0, EDV1, EDV2 values calculates three thresholds from base value temperature, capacity, rate adjustment factors stored data flash. compensation disabled, then EDV0, EDV1, EDV2 stored directly 0x95-0x96, 0x97-0x98, 0x99-0x9a, respectively. capacity correction EDV2, Battery 0x2f desired state-of-charge, STATEOFCHARGE%, range 3-19%. Typical values STATEOFCHARGE% 5-7%, representing 5-7% capacity. Battery (STATEOFCHARGE% 2.56)
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bq2084-V140 updates qualified discharge occurs from near-full threshold Near Full, until EDV2 condition reached. desired near-full threshold window programmed Near Full 0x30, 0x31 mAh. Discharge Rate Temperature Compensation Programming compensation enabled, bq2084-V140 calculates battery voltage determine EDV0, EDV1, EDV2 thresholds function battery capacity, temperature, discharge load. general equation EDV0, EDV1, EDV2 calculation EDV0,1,2 (EMF ILOAD FTZ) no-load cell voltage higher than highest cell threshold computed. programmed EMF/EDV1 0x95-0x96. ILOAD current discharge load magnitude. number series cells factor that adjusts voltage battery capacity temperature match no-load characteristics battery. (either Battery EDV0, EDV1, EDV2, respectively) capacity-related adjustment factors. programmed Factor/EDV1 0x97-98. desired residual battery capacity remaining EDV0 factor stored Factor 0xa0. current temperature represents resistance cell function temperature capacity. first order rate dependency factor stored Factor/EDV2 0x99-0x9a. current temperature; battery capacity relating EDV0, EDV1, EDV2. adjusts variation impedance with battery capacity. programmed Rate Factor 0x9d-0x9e. adjusts variation impedance with battery temperature. programmed Rate Factor 0x9b-0x9c. adjusts variation impedance cold temperatures 23°C). programmed 0x9f. Typical values compensation factors, based overall pack voltages Li-ion 3s2p 18650 pack, are: 11550/3 4475 5350/3
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Table bq2084-V140 Register Functions
FUNCTION ManufacturerAccess RemainingCapacityAlarm RemainingTimeAlarm BatteryMode AtRate AtRateTimeToFull AtRateTimeToEmpty AtRateOK Temperature Voltage Current AverageCurrent MaxError RelativeStateOfCharge AbsoluteStateOfCharge RemainingCapacity FullChargeCapacity RunTimeToEmpty AverageTimeToEmpty AverageTimeToFull ChargingCurrent ChargingVoltage Battery Status CycleCount DesignCapacity DesignVoltage SpecificationInfo ManufactureDate SerialNumber Reserved ManufacturerName DeviceName DeviceChemistry ManufacturerData Pack status Pack configuration VCELL4 VCELL3 VCELL2 VCELL1 VPACK AFEData COMMAND CODE 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0a 0x0b 0x0c 0x0d 0x0e 0x0f 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1a 0x1b 0x1c 0x1d-0x1f 0x20 0x21 0x22 0x23 0x2f (LSB) 0x2f (MSB) 0x3c 0x3d 0x3e 0x3f 0x45 0x46 ACCESS Read/write Read/write Read/write Read/write Read/write Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read Read mAh, minutes minutes minutes Boolean 0.1°K percent percent percent mAh, mAh, minutes minutes minutes cycles mAh, integer string string string string UNITS
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Self-Discharge bq2084-V140 estimates self-discharge battery maintain accurate measure battery capacity during periods inactivity. bq2084-V140 makes self-discharge adjustments every when awake periodically (determined Sleep Timer 0xfe) when sleep mode. self-discharge estimation rate 25°C doubled each degrees above 25°C halved each degrees below 25°C. Table shows relation self-discharge estimation given temperature rate programmed 25°C programmed 0x2d). Table Self-Discharge Rate Programmed
TEMPERATURE (°C) Temp Temp Temp Temp Temp Temp Temp Temp SELF-DISCHARGE RATE 16Y% 32Y%
nominal self-discharge rate, %PERDAY day), programmed 8-bit value Self-Discharge Rate 0x2d following relation: Self-Discharge Rate %PERDAY/ 0.01 Battery Electronic Load Compensation bq2084-V140 configured compensate constant load from battery electronics) present battery pack times. bq2084-V140 applies compensation continuously when charge discharge below digital filter. bq2084-V140 applies compensation (BEL) addition self-discharge. compensation occurs rate determined value stored Electronics Load 0x2e. compensation range µA-765 steps approximately data stored follows: Electronics Load Midrange Capacity Corrections bq2084-V140 applies midrange capacity corrections when VCOR Gauge Configuration 0x29. bq2084-V140 adjusts associated percentage three different voltage levels: VOC25, VOC50, VOC75. values represent open-circuit battery voltage which corresponds associated percentage each threshold. midrange corrections occur, temperature must range 19°C 31°C inclusive Current() AverageCurrent() must both report between bq2084-V140 makes midrange corrections shown Table correction occur, bq2084-V140 must detect need correction twice during subsequent 20-s intervals. With VCOR set, bq2084-V140 makes midrange corrections whenever conditions permit. OTVC Gauge Configuration 0x29 VCOR bq2084-V140 makes Voltage() measurements, determines average readings sets appropriate level. further RSOC% Voltage() validation performed until after next device reset.
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Table Midrange Corrections
CONDITION VOC75 RelativeStateOfCharge() VOC75 RelativeStateOfCharge() Voltage() VOC50 RelativeStateOfCharge() <38% <VOC50 RelativeStateOfCharge() VOC25 RelativeStateOfCharge() VOC25 RelativeStateOfCharge() RESULT RelativeStateOfCharge() RelativeStateOfCharge() RelativeStateOfCharge() RelativeStateOfCharge() RelativeStateOfCharge() RelativeStateOfCharge()
Three voltage-based thresholds, VOC25 0x88-0x89, VOC50 0x83-0x84, VOC75 0x7e-0x7f, stored data flash Charge Control bq2084-V140 internal charge control compatible with constant current/constant voltage profile Li-ion. bq2084-V140 detects primary charge termination basis tapering charge current during constant-voltage phase. Charging Voltage Broadcasts bq2084-V140 supports charge control broadcasting ChargingCurrent() ChargingVoltage() Smart Charger address. bq2084-V140 broadcasts requests every seconds. bq2084-V140 updates values used charging current voltage broadcasts based battery's state charge, voltage, temperature. 16-bit value (mV) charging voltage programmed Charging Voltage 0x03a-0x3b although different operating conditions. also sets base value determining overvoltage conditions during charging voltage compliance during constant-voltage charging methodology. 16-bit value, Over Voltage Margin 0x5d-0x5e, sets limit over ChargingVoltage() that considered overvoltage charge-suspension condition. Charging Current Broadcasts ChargingCurrent() values either broadcast Level smart battery charger read from bq2084-V140 Level smart battery charger. ChargingCurrent() take four different values: Fast-Charging Current (0x3e-0x3f), Maintenance Charging Current 0x40-0x41), Precharge Current (0x42-0x43) depending charge state operating conditions. When fast charge allowed, bq2084-V140 sets ChargingCurrent() rate programmed Fast-Charging Current 0x3e-0x3f. Fast-Charging Current stored When fast charge terminates, bq2084-V140 sets ChargingCurrent() zero then MaintenanceCharging Current 0x41 when termination condition ceases. desired maintenance current stored When Voltage() less than EDV0, bq2084-V140 sets ChargingCurrent() Precharge Current 0x42, 0x43. Typically this rate larger than maintenance rate charge deeply depleted pack point where fast charged. desired precharge rate stored temperature between Charge Inhibit Temp (DF0x46) precharge threshold (°C), bq2084-V140 sets ChargingCurrent() Precharge Current. threshold programmed Precharge Temp 0x44. maximal value precharge temperature threshold setting 12.7°C. Precharge Temp (°C) bq2084-V140 also sets ChargingCurrent() precharge rate Voltage() less than value programmed Precharge Voltage 0x3c-0x3d. Precharge Voltage programmed
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Alarm Broadcasts Smart Charger Host bits 8-15 BatteryStatus() set, bq2084-V140 broadcasts AlarmWarning() message Host address. bits 12-15 BatteryStatus() set, bq2084-V140 also sends AlarmWarning() message Smart Charger address. bq2084-V140 repeats AlarmWarning() messages every seconds until alarm bits cleared. broadcasts disabled setting (bit Pack Configuration 0x28). Precharge Qualification bq2084-V140 sets ChargingCurrent() precharge rate programmed Precharge Current 0x42-0x43 under following conditions: Voltage: bq2084-V140 requests precharge charge rate when cell voltage drops below precharge threshold when EDV0 threshold detected. Once requested, precharge rate remains until cell voltages increase above precharge threshold EDV0 condition does exist. precharge threshold programmed Precharge Voltage 0x3c-0x3d. Temperature: bq2084-V140 requests precharge rate when Temperature() between Charge Inhibit Temp (DF0x46) precharge threshold programmed Precharge Temp 0x44. Temperature( must equal greater than precharge threshold allow fast-charge rate. Charge Suspension bq2084-V140 temporarily suspend charge detects charging fault. charging fault includes following conditions. Overcurrent: overcurrent condition exists when bq2084-V140 measures charge current greater than Charge Threshold 0x12a-0x12b) time greater than Charge Time 0x12c). detecting overcurrent condition, bq2084-V140 turns Charge FET. Nonremovable Battery Misc Configuration 0x2a, then Discharge turned also. This condition cleared when pack removed Nonremovable Battery Misc Configuration 0x2a when discharge current detected when AverageCurrent() less than ClearFailCurrent 0x61-0x62 FaultResetTime 0x130. Overtemperature: During charging, overtemperature condition exists when Temperature() greater than Charge Suspend Temp High value programmed 0x6d, 0x6e. detecting overtemperature condition, enabled Misc Configuration 0x2a, bq2084-V140 turns Charge Discharge FETs. overtemperature condition cleared when Temperature() equal below Charge Suspend Temp High Reset 0x6f -0x70). condition also cleared pack removed. Undertemperature: During charging, undertemperature condition exists when Temperature() less than Charge Suspend Temp 0x79 Charge Inhibit Temp 0x46. detecting undertemperature condition bq2084-V140 turns Charge FET. undertemperature condition cleared when Temperature() greater than Charge Suspend Temp 0x79. condition also cleared pack removed. maximal value Charge Suspend Temp setting 12.7°C. Charging exceeds Maximum Charging Time 0x10f-0x110. charging time reaches Maximum Charge Time, Charge turned off. This condition cleared when pack detects discharge current removed. Cell Pack Overvoltage: overvoltage condition exist when cell greater than Cell Over Voltage Limit 0x63-0x64 Voltage() greater than Charging Voltage 0x3a-0x3b plus OvervoltageMargin 0x5d-05e. This condition cleared when pack removed Nonremovable Battery Misc Configuration 0x2a when discharge current detected when AverageCurrent() less than ClearFailCurrent 0x61-0x62 FaultResetTime 0x130. Also, overvoltage condition must cleared Voltage() less than Charging Voltage 0x3a-0x3b plus OvervoltageMargin 0x5d-05e cell voltages less than Cell Over Voltage Reset 0xe0-0xe1. Charging also temporarily suspended during pulse-charging, this considered fault condition. Pulse Charge bq2084-V140 capable charge control using pulse-charging algorithm, which allows charge control systems where charger does control current. pulse-charging algorithm uses voltage thresholds associated time limits control. These stored constants data flash. cell voltages read converter every during charging.
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voltage used comparison thresholds highest cell voltage. These thresholds three data flash constants: Charge Voltage, Voff Charge Voltage, Vmax Charge Voltage. lowest these, threshold below which charge turned provided minimum time (Pulse Minimum Time) been met. When voltage crosses Voff threshold, maximum time (Pulse Maximum Time) begins count down. When this time expired, charge turned off. time Vmax exceeded, charge turned immediately. rules are: charge voltage above Vmax, turn off. Else voltage above Voff time expired, turn off. Else count down time. charge off: voltage below minimum time, turn Else increment time. Voltage sampled every therefore, minimum time maximum time units 125ms, pulse times integral multiples voltage thresholds chosen such that they alter charge mechanism. Voff equal Vmax, then every time this threshold crossed, charge turns immediately. This effectively disables maximum charge time, that Voff threshold effect. this case, algorithm described having voltage thresholds, rather than three. charge simply turns crosses thresholds. minimum time similarly disabled setting zero one. sample interval, charge always least 125-ms cycle. Thresholds must chosen carefully desired charging behavior. example, below charge voltage minus taper voltage, pack never detect full charge. During pulse charging, charge remains until cells relax below voltage, which below qualification voltage full charge detection. During cycle phase pulse charging (charge ON), voltage exceed Voff value period 125ms until next sample taken switched OFF. prevent cell overvoltage termination, pack overvoltage termination during this period, values cell should larger than voltage reached during this period. Reasonable value cell given charger current calculated, assuming cell impedance 0.08 /cell, V(cell)OV 0.08 Correspondingly, pack overvoltage margin should V(margin) V(cell)OV V(charge) where: number series cells. When charging begins depleted battery pack, voltage below Voff, even stay below some time. This means pack under constant charge, with pulsing, some part charge cycle. voltage cells rises, crosses Voff threshold Vmax threshold Voff disabled), charge turns off. Initially, time short, because cells only barely over threshold quickly relaxed below Von. cell voltages rises, times become longer times shorter. This effect, combination with reduced current drawn cells, results gradually declining charge current. Eventually, this current falls below taper current, pack detects full charge condition stops charging. pulse-charging control operates during normal charging conditions overridden case fault condition. Charging stopped fault conditions which occur, such overtemperature overcurrent, without regard voltage thresholds time limits. Primary Charge Termination bq2084-V140 terminates charge detects charge-termination condition based current taper. charge-termination condition includes following:
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bq2084-V140 detects current taper termination when pack voltage greater than Charging Voltage 0x3a-0x3b) minus Current Taper Qualification Voltage 0x4d-0x4e) AverageCurrent() below Current Taper Threshold 0x4b-0x4c), greater than Charge Detection Current 0x113-0x114, period Current Taper Window 0x4f). Once bq2084-V140 detects Primary Charge Termination, bq2084-V140 sets TERMINATE_CHARGE_ ALARM FULLY_CHARGED bits BatteryStatus(), turns charge bq29312. charge turned when discharge current detected greater than Discharge Detection Current 0x115-0x116), minimize losses. TERMINATE_CHARGE_ ALARM cleared charge current longer detected pack removed, returns charging attempted while FULLY_CHARGED set. bq2084-V140 clears FULLY_CHARGED TERMINATE_CHARGE_ALARM when RelativeStateOfCharge() less than programmed Fully Charged Clear Table summary BatteryStatus() alarm status operation. Cell Balancing bq2084-V140 balances cells during charge discharging those cells above threshold Cell Balance Threshold 0xe8-0xe9, maximum difference cell voltages exceeds value programmed Cell Balance 0xec. cell balancing, bq2084-V140 measures cell voltages interval Cell Balance Interval 0xed. basis cell voltages, bq2084-V140 either selects appropriate cell discharge adjusts cell balance threshold value programmed Cell Balance Window 0xea-0xeb when cells exceed cell balance threshold highest cell exceeds cell balance threshold cell balance window. Cell balancing only occurs when charging current detected cell balance threshold reset value Cell Balance Threshold start every charge cycle. threshold only adjusted once during balance interval. cells severely imbalanced during charging, where VCELL(MAX) VCELL(MIN) Cell Imbalance Threshold SBS. Current()> Balance IMAX period Cell Imbalance time then Status set. Table Cell Balancing Cell Imbalance Programming
NAME Cell Balance Threshold Cell Balance Cell Balance Window Cell Balance Interval Cell Imbalance Threshold Balance IMAX Cell Imbalance Time ADDRESS 0xe8-0xe9 0xec 0xea-0xeb 0xed 0xee-0xef 0xf2-0xf3 0x134 DESCRIPTION Sets maximum voltage that each cell must achieve initiate cell balancing. Programming Cell Balance Threshold 65,535 disables cell balancing. Sets cell differential that must exist initiate cell balancing Sets amount that cell balance threshold increases during cell balancing Sets cell balancing time interval seconds. Sets severe imbalance fault limit cell imbalance detection Sets charge current required allow cell imbalance detected Sets time period during which cell imbalance must selected bq2084 enter mode.
DISPLAY PORT
General display port drives 5-LED bar-graph display. display activated logic signal DISP input. bq2084-V140 display either relative absolute mode with each representing percentage full-battery reference. relative mode, bq2084-V140 uses full-battery reference; absolute mode, uses Design Capacity (DC). DMODE Pack Configuration 0x28 programs bq2084-V140 absolute relative display mode. bits program 5-LED option.
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Activation display activated time high-to-low transition DISP input. This usually accomplished with pullup resistor pushbutton switch. Detection transition activates display starts display timer. Reactivation display requires that DISP input return logic-high state then transition again. second high-to-low transition detected only after display timer expires. unused, DISP input must pulled VCC. EDV0 set, bq2084-V140 disables display. Display Modes relative mode, each output represents 20%, 25%, RelativeStateOfCharge() value. absolute mode, each output represents 20%, AbsoluteStateOfCharge() value. Table shows display options LEDs, LEDs, Table Table LEDs. either mode, bq2084-V140 blinks display RemainingCapacity() less than Remaining CapacityAlarm(). display disabled EDV0 Table Display Mode Five LEDs
CONDITION RELATIVE ABSOLUTE StateOfCharge() EDV0 <20% 20%, 40%, 60%, LED1 FIVE-LED DISPLAY OPTION LED2 LED3 LED4 LED5
Table Display Mode Four LEDs
CONDITION RELATIVE ABSOLUTE StateOfCharge() EDV0 <25% 25%, 50%, LED1 FOUR-LED DISPLAY OPTION LED2 LED3 LED4
Table Display Mode Three LEDs
CONDITION RELATIVE ABSOLUTE StateOfCharge() EDV0 <34% 34%, LED1 THREE-LED DISPLAY OPTION LED2 LED3
LI-ION PROTECTION
bq2084-V140 along with bq29312 provides protection Li-ion batteries, shown Table bq2084-V140 measures temperature current uses bq29312 measure individual cell voltage. bq2084-V140 uses this information determine protection requirements control safety FETs SAFE output necessary. recommended that bq2084-V140 protection control validated successive measurements setting VOD=1 Misc Configuration.
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bq29312 independently detect protect load from overload (OL) short circuit charge (SCC) discharge (SCD). bq29312 sets appropriate state then alerts bq2084-V140 with XALERT output whenever protection threshold breached associated delay time expired. bq2084-V140 then determines when FETs should turned back Table CVOV CVUV Flags PackStatus()
FLAG CVOV CVUV CONDITION Voltage() ChargingVoltage() Over Voltage Margin VCELL(ANY) Cell Over Voltage VCELL(ANY) Cell Under Voltage AverageCurrent() Over Load Current Clear detected controlled bq2084-V140. there discharge current there charge current
(3)ON
CLEAR CONDITION Voltage() ChargingVoltage() VCELL(ALL) Cell Over Voltage Reset VCELL(ALL) Cell Under Voltage Reset AverageCurrent() Current Fault Clear Threshold
Protection Configuration Level Cell Voltage Thresholds cell undervoltage (VUV) overvoltage (VOV) limits programmed Cell Under Voltage Cell Over Voltage 0x65-0x66, 0x63-0x64, respectively. Both values stored Cell Over Voltage Reset 0xe0-0xe1 Cell Under Voltage Reset 0xe2-0xe3 reset points these safety parameters. Safety Overvoltage Threshold safety voltage threshold programmed Safety Over Voltage 0x6b-0x6c. stored Exceeding Safety Voltage period determined MISC Config causes permanent failure enabled PFConfig. Overcurrent Thresholds Discharge current threshold programmed Discharge Threshold 0x12d-0x12e. discharge overcurrent must exist time programmed Discharge Time 0x12f. When discharge overcurrent condition detected discharge turned off. Similarly, charge overcurrent programmed Charge ThresholdDF 0x12a-0x12b. charge overcurrent must exist time programmed Charge Time 0x12c Charge Time 0x12c. When charge overcurrent condition detected, charge turned off. Temperature Thresholds Safety Over Temperature Charge (SOTC) threshold programmed Safety Over Temperature Charge 0x75-0x76 Safety Over Temperature Discharge (SOTD) threshold programmed Safety Over Temperature Discharge 0x77-0x78. SOTC stored Safety Over Temperature Charge SOTC/0.1 (°C) unsigned integer SOTD stored Safety Over Temperature Discharge SOTD/0.1 (°C) unsigned integer. Exceeding Safety Temperatures period exceeding Over Temperature Time 0x162 causes permanent failure enabled PFConfig. There also temperature thresholds disable both charge discharge FETs Battery Status Overtemperature bit. thresholds according whether discharge charge detected. Charge Suspend Temp High threshold stored 0x6d-0x6e with reset threshold stored 0x6f-0x70. Likewise, Over Temperature Discharge threshold stored 0x71-0x72 with reset threshold stored 0x73-0x74. Misc Configuration then temperature protection disabled except Safety Over Temperature. Charge Suspend Temp threshold (CSTL) stored Charge Suspend Temp 0x79-0x7a stored Charge Suspend Temp CSTL/0.1 (°C) signed integer. Charge Suspend Temp turns charge FET. maximal value Charge Suspend Temp setting 12.7
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Configuration protection limits programmed specified bq29312 data sheet. Over Load 0xc5 sets overload protection threshold. Over Load Delay 0xc6 sets delay timing overload protection. Short Circuit Charge 0xc7 sets short circuit charge protection threshold delay time. Short Circuit Discharge 0xc8 sets short circuit discharge protection threshold delay time. SMBus command 0x46 used string-read with address 0x00 first, bq2084-V140 sealed indicated PackStatus. Table Overcurrent Protection
FAILURE NR=1 ZVCHG off, off, ZVCHG off, Same Average Current Clear Fail Current 0x61/2) Fault Reset Time 0x130), discharge current discharge detection current 0x115/6) Average Current -Clear Fail Current 0x61/2) Fault Reset Time 0x130), charge current charge detection current 0x113/4) Same Same EXIT CONDITIONS RRES=high PRES=high PRES=high PRES=high PRES=high STATUS CLEAR CONDITIONS
Charge (set 0x12a 0x12c) NR=0 FAILURE Charge (set 0x12a 0x12c)
ZVCHG off, off, ZVCHG off,
Discharge (set 0x12d 0x12f) ZVCHG off, STATUS FETs FETs FETs FETs
Discharge (set 0x12d 0x12f) FETs
protection features also recover automatically after Recovery Time 0x160) Recovery Time nonzero value. When protection feature recovered this manner, does re-trigger Hold Time 0x161). Integrity Check bq2084-V140 checks programming registers period determined Check Time 0xfb. units check period seconds unless bq2084-V140 sleep mode, which case period Check Time Sleep Current Multiplier 0xfd). data correct, bq2084-V140 increments internal counter until reaches Fail Limit 0xe4). Setting Check Time disables this function. When internal Fail counter reaches Fail Limit, then Status set. Watchdog Fault Clear bq29312 feature where 32-kHz output (CLKOUT, bq2084-V140 used drive internal clock. this clock fails, fault declared AFE. bq29312 data sheet further details. fault cleared automatically return 32-kHz input bq2084-V140 CLKOUT pin. Permanent Failure Mode (SAFE Output) SAFE output bq2084-V140 provides additional level safety control. active safety output blow fuse control another switch basis temperature, pack-voltage cell-voltage, Failure, severe cell imbalance, integrity check Data Flash configuration registers.
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bq2084-V140 also activate SAFE output Flag based PFIN input. this PFIN Time seconds then PFIN Status set. SAFE output driven following conditions, bq2084-V140 sets Flag register 0x11e) 0x66 (011001100). activation SAFE output setting Flag enabled disabled different safety option Config 0x11f) register settings. SAFE output Flag register only cleared using series ManufacturerAccess() commands. Table SAFE Activation Conditions
CONDITION Voltage() Safety Over Voltage 0x6b 0x6c), Temperature() Safety Over Temperature Charge 0x75 0x76) Temperature() Safety Over Temperature Discharge 0x77 0x78) When Miscellaneous Configuration (0x2a) set, number failures reached Fail Limit 0xe4) When VCELL(MAX) VCELL(MIN) Cell Imbalance Threshold 0xee, 0xef) during charging charge off, charge current greater than Fail charge current stored 0x125-0x126 time determined Fail time 0x129, discharge discharge current greater than Fail discharge current stored 0x127-0x128 time determined Fail time 0x129. PFIN input detected state PFIN Time consecutive seconds, determined 0x120 SAFE output activated Flag only enabled Config 0x0x11f) ACTIONS SOTC SOTD FETF
PFIN,
Permanent Failure Status Status)
Status 0x11d contains flags cause permanent failure mode.
PFIN FETF SOTD SOTC
indicates safety overvoltage occurred which enabled Config would cause SAFE output activate. fault detected (default) fault detected
SOTC SOTC indicates safety overtemperature charge occurred which enabled Config would cause SAFE output activate. SOTC fault detected (default) SOTC fault detected
SOTD SOTD indicates safety overtemperature discharge occurred which enabled Config would cause SAFE output activate. indicates integrity fault state occurred which enabled Config would cause SAFE output activate. operating correctly (default) Integrity check fail limit reached SOTD fault detected (default) SOTD fault detected
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indicates that severe cell imbalance occurred during charging, which enabled Config, would cause SAFE output activate. cells within Cell Imbalance Threshold (default) There severe cell imbalance
FETF FETF indicates driver failure occurred, which enabled Config would cause SAFE output activate. PFIN PFIN used indicate that output level protector activated. used indicate that current been detected when fuse been blown. Current detected with fuse blown Current detected with fuse blown PFIN input high (default) PFIN input drive held level protector output FETs operating normally (default) FETs drivers have fault
Permanent Failure Configuration Config)
Config 0x11f contains enable/disable configuration that determines SAFE output activated Flag each possible failure mode.
XPFIN XFETF XCIM XAFE XSOTD XSOTC XSOV
XSOV XSOV enables disables activation SAFE setting Flag when Status set. Activation disabled (default) Activation enabled
XSOTC XSOTC enables disables activation SAFE setting Flag when Status SOTC set. Activation disabled (default) Activation enabled
XSOTD XSOTD enables disables activation SAFE setting Flag when Status SOTD set. Activation disabled (default) Activation enabled
XAFE XAFE enables disables activation SAFE setting Flag when Status set. Miscellaneous Config 0x2a also needs activation.
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XCIM
Activation disabled (default) Activation enabled
XCIM enables disables activation SAFE setting Flag when Status set. Activation disabled (default) Activation enabled
XFETF XFETF enables disables activation SAFE setting Flag when Status FETF set. Activation disabled (default) Activation enabled
XPFIN XPFIN enables disables activation SAFE setting Flag when Status PFIN set. Activation disabled (default) Activation enabled
Permanent Failure Flag Flag)
Flag 0x11e contains flag indicating /SAFE output been activated.
STATE Clear
FLAG Flag indicates that SAFE output bq2084-V140 been activated. 0x00 0x66 SAFE output high (default) SAFE output activated
example circuit using SAFE output blow fuse shown Figure
Figure Example SAFE Circuit Implementation
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Low-Power Modes bq2084-V140 enters sleep mode when charge discharge current less than threshold programmed Sleep Current Threshold 0xfc, SMBus lines least Misc. Configuration 0x2a zero. Additionally, PRES must pulled high Misc Config bq2084-V140 wakes periodically monitor voltage temperature apply self-discharge adjustment. sleep period Sleep Timer 0xfe. bq2084-V140 wakes period Sleep Current Multiplier 0xfd multiplied Sleep Time measure current. bq2084-V140 comes sleep when either SMBus lines high when current measured greater than Sleep Current Threshold. sleep current threshold, (mA), stored Sleep Current Thresh 0xfc Sleep Current Thresh SLP(mA)/0.5 wake-up period current measurement, WAT(s), using following formula: Sleep Current Multiplier Sleep Time WAT(s) During sleep mode, both charge discharge FETs turned Misc Config cleared. bq2084-V140 Non-Removable mode where NR=1, then discharge retains state entry sleep. Shutdown Mode bq2084-V140 goes into shutdown, which FETs turned pack electronics powered down (including bq2084-V140), when SBS.Voltage() falls below Shutdown Voltage 0x7c-0x7d Voltage Pack less than VPACK threshold 0x131, 0x132) both consecutive samples Vpack programmed units 0.935 mV/count tolerance ±6%. example, Vpack Threshold, program value should 12000/0.935 12834. When turned pack voltage close battery voltage even with charger attached. Therefore, enter shutdown, Vpack threshold should higher than shutdown threshold plus tolerance. bq2084-V140 also instructed enter Shutdown mode ManufacturerAccess() command. When command sent bq2084-V140, bq29312 instructed enter shutdown mode bq2084-V140. This forces chipset into lowest power mode. bq2084-V140 does issue shutdown command unless pack voltage less than Vpack Threshold. Program Vpack threshold higher than SBS.Voltage() when ship command issued. Exit from this mode only achieved application charger. After exiting shutdown mode, bq2084-V140 does enter shutdown mode again until Shutdown Timer 0x133, units seconds) expired even correct conditions present. After Shutdown Timer expired, SMBus command voltage current conditions enables bq2084-V140 enter shutdown mode.
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Normal Operation SBS.VCELLx( Measured SBS.PackVoltage( Measured SBS.Voltage( calculated
SBS.Voltage( DF.Shutdown Threshold
SBS.Current(
SBS.PackVoltage( DF.Vpack Threshold
Time since exit from last Shutdown DF.Shutdown Timer?
bq2084 Enters Shutdown
DEFAULTS:
Non-Removable Pack DF.ShutdownVoltage Number Series cells; DF.ShutdownTimer NOTE: VpackThreshold must greater than Shutdown voltage Removable Pack DF.ShutdownVoltage Number Series cells; DF.ShutdownTimer NOTE: VpackThreshold must greater than Shutdown voltage
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Figure Shutdown Flow Chart Normal Operation
command 0x05 received
SBS.Current(
Pack voltage Vpack threshold
bq2084 Enters Shutdown
Figure Shutdown Flow Chart Reset Conditions power entire reset data loaded from Data Flash configure Data battery management solution. partial reset (loss holds valid), limited number locations taken. These actions following: registers rewritten. PackStatus() EDV2 flag cleared. BatteryStatus() DISCHARGING flag cleared. charger alarm broadcast period seconds between broadcasts.
COMMUNICATION
bq2084-V140 includes SMBus communication port. SMBus interface 2-wire bidirectional protocol using SMBC (clock) SMBD (data) pins. communication lines isolated from pulled higher than VCC. Also, bq2084-V140 does pull these lines part zero. communication ports allow host controller, SMBus compatible device, other processor access memory registers bq2084-V140. this system efficiently monitor manage battery.
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SMBus SMBus interface command-based protocol. processor acting master initiates communication bq2084-V140 generating start condition. start condition consists high-to-low transition SMBD line while SMBC high. processor then sends bq2084-V140 device address 0001011 (bits 7-1) plus (bit followed SMBus command code. (LSB) command code instruct bq2084-V140 either store forthcoming data register specified SMBus command code output data from specified register. processor completes access with stop condition. stop condition consists low-to-high transition SMBD line while SMBC high. With SMBus, most-significant (MSB) data byte transmitted first. some instances, bq2084-V140 acts master. This occurs when bq2084-V140 broadcasts charging requirements alarm conditions device addresses 0x12 (SBS Smart Charger) 0x10 (SBS Host Controller.) SMBus Protocol bq2084-V140 supports following SMBus protocols: Read word Write word Block read processor acting master uses three protocols communicate with bq2084-V140. bq2084-V140 acting master uses write word protocol. SMBD SMBC pins open drain require external pullup resistors. pulldown resistor battery pack SMBC SMBD required ensure detection SMBus off-state, performance automatic offset calibration, initiation low-power sleep mode when battery pack removed. SMBus Packet Error Checking bq2084-V140 supports packet error checking mechanism confirm proper communication between another SMBus device. Packet error checking requires that both transmitter receiver calculate packet error code (PEC) each communication message. device that supplies last byte communication message appends message. receiver compares transmitted result determine there communication error. Protocol bq2084-V140 receive transmit data with without PEC. Figure shows communication protocol read word, write word, read block messages without PEC. Figure includes PEC. read word protocol, bq2084-V140 receives after last byte data from host. host does support PEC, last byte data followed stop condition. After receipt PEC, bq2084-V140 compares value calculation. correct, bq2084-V140 responds with ACKNOWLEDGE (ACK). correct, bq2084-V140 responds with ACKNOWLEDGE (NACK) sets error code. write word block read, host generates after last byte data sent bq2084-V140. bq2084-V140 then sends host acting master-receiver generates NACK stop condition.
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Gauge
Figure SMBus Communication Protocol Without
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Gauge
Figure SMBus Communication Protocol With Calculation basis calculation 8-bit cyclic redundancy check (CRC-8) based polynomial C(X) calculation includes bytes transmission, including address, command, data. calculation does include ACKNOWLEDGE, ACKNOWLEDGE, start, stop, repeated start bits. example, host requests RemainingCapacity() from bq2084-V140. This includes host following read word protocol. bq2084-V140 calculates based following bytes data, assuming remaining capacity battery 1001 mAh. Battery Address with 0x16 Command Code RemainingCapacity(): 0x0f Battery Address with 0x17 RemainingCapacity(): 0x03e9 0x160f17e903, bq2084-V140 transmits 0xe8 host. Enable Master Mode master mode broadcasts charger, host, both enabled/disabled with combination bits Pack Configuration 0x28. SMBus Off-State bq2084-V140 detects whether SMBus enters State monitoring SMBC SMBD lines. When both signals continually least bq2084-V140 detects State. When SMBC SMBD lines high, bq2084-V140 detects State begin communication within One-M pulldown resistors SMBC SMBD recommended reliable State detection.
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Command Codes SMBus command codes Temperature(), Voltage(), Current(), AverageCurrent(), performance specifications bq29312 regulated (V(REG)) temperature -20°C 85°C. Manufacturer Access() (0x00) Description: This function provides writable command codes control bq2084-V140 during normal operation pack manufacture. Writing command code command 0x00 causes following reads with command 0x00 return word indicated table. following commands available:
COMMAND CODE 0x0001 0x0002 0x0003 0x0004 0x0005 0x062b NAME Device Type Firmware Level Manufacturer Status SHIP Command Seal DESCRIPTION Returns part number read, i.e., 2084 (0x0824) Returns firmware version read Returns pending end-of-discharge voltage level read Returns battery system status read Instructs bq2084-V140 instruct bq29312 enter ship mode Instructs bq2084-V140 restrict access those functions listed Table bq2084-V140 completes seal function clears ManufacturerAccess().
Manufacture Status word defined
FET1 FET0 STATE3 STATE2 STATE1 STATE0
FET1, FET0 Indicated state charge discharge FETs PF1, Indicates permanent failure cause when permanent failure indicated STATE3-STATE0 Fuse blown Cell imbalance failure Safety voltage failure failure Both charge discharge FETs Charge off, discharge Both charge discharge FETs off. Charge discharge off.
STATE3, STATE2, STATE1, STATE0 Indicates battery state defined State Status Summary. Purpose: ManufacturerAccess() function provides system host access bq2084-V140 functions that defined SBD. SMBus protocol: Read write word Input/Output: Word
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Table State Status Summary
State wakeup precharge chargesusp terminatecharge normalcharge provisionalcharge normaldischarge depleted depleted_ac overheatdischarge overheatcharge battfail_overcharge battfail_lowtemp battfail_chargeterminate battfail_afe_chg battfail_afe_dsg battfail_chg battfail_dsg removed sleep permanent_failure 0x08 Fault Charge Terminate 0x0c Battery Failure 0x0a Over Current 0x0f Battery 0x0d Sleep 0x09 Permanent Failure 0x0e System Present Mode (MSB) 0x00 Wake 0x03 Precharge 0x04 Charge Suspension 0x07 Charge Terminate 0x05 Charge 0x01 Normal CC() CV() (2)f (6)f off(7) ZVCHG off( (4)) FUSE blow Power Mode normal normal normal normal normal normal normal normal normal normal normal normal normal normal normal normal normal normal normal
always discharge current greater than Discharge Detection Current 0x115, 0x116) Config (Common precharge, charge FET) ZVCHG Config (ZVCHG precharge FET) ZVCHG Config (ZVCHG FET), ZVCHG off, Config (precharge FET) CVOV CVOV minimum cell voltage less than precharge cell voltage threshold MiscConfig.Nonremoveable Battery set, then
RemainingCapacityAlarm() (0x01) Description: Sets gets low-capacity threshold value. Whenever RemainingCapacity() falls below low-capacity value, bq2084-V140 sends AlarmWarning() messages SMBus host with REMAINING_CAPACITY_ALARM set. low-capacity value disables this alarm. bq2084-V140 initially sets low-capacity value Remaining Capacity Alarm value programmed 0x02-0x03. low-capacity value remains unchanged until altered RemainingCapacityAlarm() function. low-capacity value expressed either current (mA) power mWh) depending setting BatteryMode() CAPACITY_MODE bit. Purpose: RemainingCapacityAlarm() function used systems that know much power they require save their operating state. enables those systems more finely control point which they transition into suspend hibernate state. low-capacity value read verify value bq2084-V140 low-capacity alarm. SMBus protocol: Read write word Input/Output: Unsigned integer-value below which Capacity messages sent.
BATTERY MODES CAPACITY_MODE Units Range Granularity Accuracy 0-65,535 applicable RemainingCapacity() Submit Documentation Feedback CAPACITY_MODE 0-65,535
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RemainingTimeAlarm() (0x02) Description: Sets gets Remaining Time Alarm value. Whenever AverageTimeToEmpty() falls below remaining time value, bq2084-V140 sends AlarmWarning() messages SMBus host with REMAINING_TIME_ALARM set. remaining time value effectively disables this alarm. bq2084-V140 initially sets remaining time value Remaining Time Alarm value programmed 0x00-0x01. remaining time value remains unchanged until altered RemainingTimeAlarm() function. Purpose: RemainingTimeAlarm() function used systems that want adjust when remaining time alarm warning sent. remaining time value read verify value bq2084-V140 RemainingTimeAlarm(). SMBus protocol: Read write word Input/Output: Unsigned integer-the point below which remaining time messages sent. Units: Minutes Range: 65,535 minutes Granularity: applicable Accuracy: AverageTimeToEmpty(). BatteryMode() (0x03) Description: Selects various battery operational modes reports battery's mode requests. Defined modes include Whether battery capacity information specified units (CAPACITY_MODE bit) Whether ChargingCurrent() ChargingVoltage() values broadcast smart battery charger when CHARGER_MODE set. Whether broadcasts smart battery charger host disabled defined request condition battery requesting conditioning cycle (RELEARN_FLAG). Purpose: CAPACITY_MODE allows power management systems best match their electrical characteristics with those reported battery. example, switching power supply represents constant power load, whereas linear supply better represented constant current model. CHARGER_MODE allows SMBus host smart battery charger override smart battery desired charging parameters disabling bq2084-V140 broadcasts. RELEARN_FLAG allows bq2084-V140 request conditioning cycle. SMBus protocol: Read write word Input/Output: Unsigned integer-bit mapped-see Table Units: applicable Range: Granularity: applicable Accuracy: applicable BatteryMode() word divided into halves, (bits 8-15) which read/write (bits 0-7) which read only. bq2084-V140 forces bits zero prohibits writes Table summarizes meanings individual bits BatteryMode() word. Specified default values, where applicable, noted. INTERNAL_CHARGE_CONTROLLER used bq2084-V140. PRIMARY_BATTERY_SUPPORT used bq2084-V140. RELEARN_FLAG indicates that bq2084-V140 requesting capacity relearn cycle battery. bq2084-V140 sets RELEARN_FLAG full reset detects 20-cycle counts without update. bq2084-V140 clears this flag after learning cycle been completed. CHARGE_CONTROLLER_ENABLED used bq2084-V140. bq2084-V140 forces this zero.
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PRIMARY_BATTERY used bq2084-V140. bq2084-V140 forces this zero. Table Battery Mode Bits Values
Battery Mode() BITS INTERNAL_CHARGE_CONTROLLER PRIMARY_BATTERY_SUPPORT Reserved RELEARN_FLAG CHARGE_CONTROLLER_ENABLED PRIMARY_BATTERY Reserved ALARM_MODE CHARGER_MODE CAPACITY_MODE BITS USED 10-12 flag flag flag Read only flag flag flag FORMAT Read only flag Read only flag ALLOWABLE VALUES always always zero always zero 0-Battery OK1-Relearn cycle requested used used always zero 0-Enable alarm broadcast (default)1-Disable alarm broadcast 0-Enable charging broadcast (default)1-Disable charging broadcast 0-Report (default)1-Report
ALARM_MODE disable bq2084-V140s ability master SMBus send AlarmWarning() messages SMBus host smart battery charger. When set, bq2084-V140 does master SMBus, AlarmWarning() messages sent SMBus host smart battery charger period more than less than 59s. When cleared (default), smart battery sends AlarmWarning() messages SMBus host smart battery charger time alarm condition detected. ALARM broadcast does occur more often than once every Whenever BATTERY_MODE command received, bq2084-V140 resets starts restarts 60-s (nominal) timer. After timer expires, bq2084-V140 automatically enables alarm broadcasts ensure that accidental deactivation broadcasts does persist. SMBus host that does want bq2084-V140 master SMBus must therefore continually this least once keep bq2084-V140 from broadcasting alarms. ALARM_MODE defaults cleared state when bq2084-V140 enters SLEEP mode. condition ALARM-MODE does affect operation state CHARGER_MODE bit, which used prevent broadcasts ChargingCurrent() ChargingVoltage() smart battery charger. CHARGER_MODE enables disables bq2084-V140's transmission ChargingCurrent() ChargingVoltage() messages smart battery charger. When set, bq2084-V140 does transmit ChargingCurrent() ChargingVoltage() values smart battery charger. When cleared, bq2084-V140 transmits ChargingCurrent() ChargingVoltage() values smart battery charger. CHARGER_MODE defaults cleared state when bq2084-V140 enters SLEEP mode. CAPACITY_MODE indicates capacity information reported mA/mAh mW/10 mWh. When set, bq2084-V140 reports capacity information mW/10 appropriate. When cleared, bq2084-V140 reports capacity information mA/mAh appropriate. CAPACITY_MODE defaults cleared state when bq2084-V140 enters SLEEP mode. following functions changed accept return values mA/mAh mW/10 depending CAPACITY_MODE bit: RemainingCapacityAlarm() AtRate() RemainingCapacity() FullChargeCapacity() DesignCapacity() following functions calculated basis capacity calculated differently depending CAPACITY_MODE bit: AtRateOK() AtRateTimeToEmpty()
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AtRateTimeToFull() RunTimeToEmpty() AverageTimeToEmpty() AverageTimeToFull() Remaining Time Alarm() BatteryStatus()
bq2084-V140 updates non-AtRate related register values immediately after changing state CAPACITY_MODE bit. AtRate() values updated after next AtRate() value written bq2084-V140 after next scheduled refresh calculation). AtRate() (0x04) Description: AtRate() function first half two-function call-set used AtRate value used calculations made AtRateTimeToFull(), AtRateTimeToEmpty(), AtRateOK() functions. AtRate value expressed either current (mA) power depending setting BatteryMode() CAPACITY_MODE bit. Purpose: Because AtRate() function first half two-function call-set, followed second function call-set that calculates returns value based AtRate value battery's present state. When AtRate() value positive, AtRateTimeToFull() function returns predicted time full charge AtRate value charge. When AtRate() value negative, AtRateTimeToEmpty() function returns predicted operating time AtRate value discharge. When AtRate() value negative, AtRateOK() function returns Boolean value that predicts battery's ability supply AtRate value additional discharge energy (current power) seconds. default value AtRate() zero. SMBus protocol: Read write word Input/Output: Signed integer-charge discharge; AtRate() value positive charge, negative discharge, zero neither (default).
BATTERY MODES CAPACITY_MODE Units Charge range Discharge range Granularity Accuracy 32,767 -32,768 Unit CAPACITY_MODE 32,767 -32,768
AtRateTimeToFull() (0x05) Description: Returns predicted remaining time fully charge battery AtRate() value (mA). Purpose: AtRateTimeToFull() function part two-function call-set used determine predicted remaining charge time AtRate value bq2084-V140 updates AtRateTimeToFull() within after SMBus host sets AtRate value. bq2084-V140 automatically updates AtRateTimeToFull() based AtRate() value every SMBus protocol: Read word Output: Unsigned integer-predicted time minutes fully charge battery. Units: Minutes Range: 65,534 Granularity: better
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Accuracy: MaxError() FullChargeCapacity()/|AtRate()| Invalid Data Indication: 65,535 indicates AtRate AtRateTimeToEmpty() (0x06) Description: Returns predicted remaining operating time battery discharged AtRate() value. Purpose: AtRateTimeToEmpty() function part two-function call-set used determine remaining operating time AtRate() value. bq2084-V140 updates AtRateTimeToEmpty() within after SMBus host sets AtRate() value. bq2084-V140 automatically updates AtRateTimeToEmpty() based AtRate() value every SMBus protocol: Read word Output: Unsigned integer-estimated operating time left. Units: Minutes Range: 65,534 Granularity: better Accuracy: +MaxError() FullChargeCapacity/|AtRate()| Invalid Data Indication: 65,535 indicates AtRate AtRateOK() (0x07) Description: Returns Boolean value that indicates whether battery deliver AtRate() value additional energy AtRate value zero positive, AtRateOK() function ALWAYS returns (logic Purpose: AtRateOK() function part two-function call-set used power management systems determine battery safely supply enough energy additional load. bq2084-V140 updates AtRateOK() within after SMBus host sets AtRate() value. bq2084-V140 automatically updates AtRateOK() based Rate() value every second. SMBus protocol: Read word Output: Boolean-indicates battery supply additional energy requested. Units: Boolean Range: Granularity: applicable Accuracy: applicable Temperature() (0x08) Description: Returns temperature measured bq2084-V140. Purpose: Temperature() function provides accurate cell temperatures battery chargers thermal management systems. battery charger temperature safety check. Thermal management systems temperature because battery largest thermal sources system. SMBus protocol: Read word Output: Unsigned integer-cell temperature tenth-degree Kelvin increments. Units: 0.1°K Range: +6553.5°K {real range} Granularity: 0.1°K Accuracy: ±1.5°K (from ideal Semitec 103AT thermistor performance, after calibration)
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Voltage() (0x09) Description: Returns cell-pack voltage (mV). Purpose: Voltage() function provides power management systems with accurate battery terminal voltage. Power management systems this voltage, along with battery current information, characterize devices they control. This ability helps enable intelligent, adaptive power-management systems. SMBus protocol: Read word Output: Unsigned integer-battery terminal voltage Units: Range: 20,000 Granularity: Accuracy: ±0.25% (after calibration) Current() (0x0a) Description: Returns current being supplied accepted) battery (mA). Purpose: Current() function provides snapshot power management system current flowing into battery. This information particular power-management systems because they characterize individual devices tune their operation actual system power behavior. SMBus protocol: Read word Output: Signed integer-charge/discharge rate increments: positive charge, negative discharge. Units: Range: -32,768 32,767 Granularity: Accuracy: 0.25% whichever greater AverageCurrent() (0x0b) Description: Returns value that approximates one-minute rolling average current being supplied accepted) through battery terminals (mA). AverageCurrent() implemented single pole filter with 14.5-s time constant. Purpose: AverageCurrent() function provides average current flowing into battery power management system. SMBus protocol: Read word Output: Signed integer-charge/discharge rate increments: positive charge, negative discharge. Units: Range: -32,768 32,767 Granularity: Accuracy: 0.25% whichever greater MaxError() (0x0c) Description: Returns expected margin error state charge calculation. example, when MaxError() returns RelativeStateOfCharge() returns 50%, RelativeStateOfCharge() more likely between 60%. bq2084-V140 sets MaxError() 100% full reset. bq2084-V140 sets MaxError() completion learning cycle, unless bq2084-V140 limits learning cycle +512/-256 maximum adjustment values. learning cycle limited, bq2084-V140 sets MaxError() unless MaxError() already below this case, MaxError() does change. bq2084-V140 increments MaxError( after four increments CycleCount() without learning cycle. voltage-based corrections applied coulomb counter, MaxError() 25%.
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Purpose: MaxError() function real value ways: first, give user confidence level about state charge second, give power management system information about aggressive should particularly battery nears life. SMBus protocol: Read word Output: Unsigned integer-percent uncertainty selected information. Units: Range: 2-100% Granularity: Accuracy: applicable RelativeStateOfCharge() (0x0d) Description: Returns FullChargeCapacity() (%). predicted remaining battery capacity expressed percentage
Purpose: RelativeStateOfCharge() function used estimate amount charge remaining battery relative last learned capacity. SMBus protocol: Read word Output: Unsigned integer-percent remaining capacity. Units: Range: 0-100% Granularity: Accuracy: +MaxError() AbsoluteStateOfCharge()(0x0e) Description: Returns predicted remaining battery capacity expressed percentage DesignCapacity() (%). Note that AbsoluteStateOfCharge() return values greater than 100%. Purpose: AbsoluteStateOfCharge() function used estimate amount charge remaining battery relative nominal DesignCapacity(). SMBus protocol: Read word Output: Unsigned integer-percent remaining capacity. Units: Range: 0-100+% Granularity: Accuracy: +MaxError() RemainingCapacity() (0x0f) Description: Returns predicted charge energy remaining battery. RemainingCapacity() value expressed either charge energy, depending setting BatteryMode() CAPACITY_MODE bit. Purpose: RemainingCapacity() function returns battery's remaining capacity. This information numeric indication remaining charge energy given AbsoluteStateOfCharge() RelativeStateOfCharge() functions better form power management systems. SMBus protocol: Read word Output: Unsigned integer-remaining charge units mWh.
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BATTERY MODES CAPACITY_MODE Units Range Granularity Accuracy 0-65,535 +MaxError() CAPACITY_MODE 0-65,535 FullCharageCapacity()
FullChargeCapacity() (0x10) Description: Returns predicted pack capacity when fully charged. FullChargeCapacity() value expressed either current (mAh discharge rate) power discharge rate) depending setting BatteryMode()CAPACITY_MODE bit. Purpose: FullChargeCapacity() function provides means understanding tank size battery. This information, along with information about original capacity battery, indicates battery wear. SMBus protocol: Read word Output: Unsigned integer-estimated full-charge capacity units mWh.
BATTERY MODES CAPACITY_MODE Units Range Granularity Accuracy 0-65,535 CAPACITY_MODE 0-65,535 +MaxError() FullCharageCapacity()
RunTimeToEmpty() (0x11) Description: Returns predicted remaining battery life present rate discharge (minutes). TheRunTimeToEmpty() value calculated based either current power depending setting BatteryMode() CAPACITY_MODE bit. Purpose: RunTimeToEmpty() provides power management system with information about relative gain loss remaining battery life response change power policy. This information same AverageTimeToEmpty(), which suitable determine effects that result from change power policy. SMBus protocol: Read word Output: Unsigned integer-minutes operation left. Units: Minutes Range: 65,534 Granularity: better Accuracy: Current() Invalid Data Indication: 65,535 indicates battery being discharged. AverageTimeToEmpty() (0x12) Description: Returns predicted remaining battery life (minutes), based AverageCurrent. AverageTimeToEmpty() value calculated based either current power depending setting BatteryMode()CAPACITY_MODE bit. Purpose: AverageTimeToEmpty() displays state-of-charge information more useful way. averages instantaneous estimations that remaining time does appear jump around. SMBus protocol: Read word Output: Unsigned integer-minutes operation left.
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Units: Minutes Range: 65,534 Granularity: better Accuracy: +MaxError() FullChargeCapacity() AverageCurrent() Invalid Data Indication: 65,535 indicates battery being discharged. AverageTimeToFull() (0x13) Description: Returns predicted remaining time until battery reaches full charge (minutes), based AverageCurrent. Purpose: AverageTimeToFull() function used SMBus host's power management system policy. also used find long system must left achieve full charge. SMBus protocol: Read word Output: Unsigned integer-remaining time minutes. Units: Minutes Range: 65,534 minutes Granularity: minutes better Accuracy: +MaxError() FullChargeCapacity() AverageCurrent() Invalid Data Indication: 65,535 indicates battery being charged. ChargingCurrent() (0x14) Description: Returns desired charging rate Purpose: ChargingCurrent() function sets maximum charge current battery. TheChargingCurrent() value should used combination with ChargingVoltage() value charger's operating point. Together, these functions permit bq2084-V140 dynamically control charging profile (current/voltage) battery. bq2084-V140 effectively turn charger returning value this function. charger operated constant-voltage source above maximum regulated current range returning ChargingCurrent() value 65,535. SMBus protocol: Read word Output: Unsigned integer-maximum charger output current Units: Range: 65,535 Granularity: Accuracy: applicable Invalid Data Indication: 65,535 indicates that charger should operate voltage source outside maximum regulated current range. ChargingVoltage() (0x15) Description: Returns desired charging voltage Purpose: ChargingVoltage() function sets maximum charge voltage battery. ChargingVoltage() value should used combination with ChargingCurrent() value charger's operating point. Together, these functions permit bq2084-V140 dynamically control charging profile (current/voltage) battery. charger operated constant-current source above maximum regulated voltage range returning ChargingVoltage() value 65,535. SMBus protocol: Read word Output: Unsigned integer-charger output voltage
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Units: Range: 65,535 Granularity: Accuracy: applicable Invalid Data Indication: 65,535 indicates charger should operate current source outside maximum regulated voltage range. BatteryStatus() (0x16) Description: Returns bq2084-V140 status word (flags). Some BatteryStatus() flags REMAINING_TIME_ALARM) calculated basis either current power depending setting BatteryMode()CAPACITY_MODE bit. This important because wrong calculation mode result inaccurate alarm. Purpose: BatteryStatus() function used power management system alarm status bits, well error codes from bq2084-V140. This basically same information broadcast both SMBus host smart battery charger AlarmWarning() function except that AlarmWarning() function sets error code bits high before sending data. SMBus protocol: Read word Output: Unsigned Integer-status register with alarm conditions bit-mapped follows:
ALARM BITS 0x8000 0x4000 0x2000 0x1000 0x0800 0x0400 0x0200 0x0100 STATUS BITS 0x0080 0x0040 0x0020 0x0010 ERROR CODES 0x0007 0x0006 0x0005 0x0004 0x0003 0x0002 0x0001 0x0000 Unknown Error BadSize Overflow/Underflow AccessDenied UnsupportedCommand ReservedCommand Busy Initialized DISCHARGING FULLY_CHARGED FULLY_DISCHARGED OVER_CHARGED_ALARM TERMINATE_CHARGE_ALARM Reserved OVER_TEMP_ALARM TERMINATE_DISCHARGE_ALARM Reserved REMAINING_CAPACITY_ALARM REMAINING_TIME_ALARM
ALARM BITS
OVER_CHARGED_ALARM whenever bq2084-V140 detects that battery being charged beyond maximum overcharge limit, which full capacity plus Maximum Overcharge 0x51-0x52. This cleared when bq2084-V140 detects that battery longer being charged there continuous discharge (i.e., bq2084-V140 detects discharge activity activity above digital filter).
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TERMINATE_CHARGE_ALARM when bq2084-V140 detects primary charge termination. This cleared when bq2084-V140 detects that battery longer being charged. OVER_TEMP_ALARM when bq2084-V140 detects that internal battery temperature greater than equal OverTemperature Charge threshold while charging OverTemperature Discharge threshold while discharging. This cleared when internal temperature falls back below OverTemperature Charge Reset OverTemperature Discharge Reset appropriate. TERMINATE_DISCHARGE_ALARM when Voltage() Terminate Voltage 0x67-0x68, battery temperature less than equal Charge Suspend Temp 0x79 CVUV pack status indicating that Li-ion cell voltage dropped below limit programmed Cell Under. cleared when Voltage() Terminate Voltage, RM() CVUV cleared. REMAINING_CAPACITY_ALARM when bq2084-V140 detects that RemainingCapacity() less than that RemainingCapacityAlarm() function. This cleared when either value RemainingCapacityAlarm() function lower than RemainingCapacity() when RemainingCapacity() increased charging. REMAINING_TIME_ALARM when bq2084-V140 detects that estimated remaining time present discharge rate less than that RemainingTimeAlarm() function. This cleared when either value RemainingTimeAlarm() function lower than AverageTimeToEmpty() when AverageTimeToEmpty() increased charging.
STATUS BITS
initialized when bq2084-V140 detected valid load data flash full partial reset. cleared when bq2084-V140 detects improper data flash load. DISCHARGING when bq2084-V140 determines that battery being charged. This cleared when bq2084-V140 detects that battery being charged. FULLY_CHARGED when bq2084-V140 detects primary charge termination Overcharge condition. cleared when RelativeStateOfCharge() less than programmed Fully Charged Clear 0x4a. FULLY_DISCHARGED when Voltage() VCELL less than EDV2 threshold Current() Overload Current when RelativeStateOfCharge() Battery This cleared when RelativeStateOfCharge() greater than equal 20%.
ERROR CODES
ERROR CODES Busy Reserved DESCRIPTION bq2084-V140 processed function code without detecting errors. bq2084-V140 unable process function code this time. bq2084-V140 detected attempt read write function code reserved this version specification. bq2084-V140 detected attempt access unsupported optional manufacturer function code. bq2084-V140 does support this function code which defined this version specification. bq2084-V140 detected attempt write read-only function code. bq2084-V140 detected data overflow underflow. bq2084-V140 detected attempt write function code with incorrect data block. bq2084-V140 detected unidentifiable error.
Unsupported AccessDenied Overflow/Underflow BadSize UnknownError
CycleCount()(0x17) Description: Returns number cycles battery experienced. value each count determined programming Cycle Count Threshold value 0x38-0x39. bq2084-V140 saves cycle count value Cycle Count 0x0c-0x0d after update CycleCount(). Purpose: CycleCount() function provides means determine battery wear. used give advance warning that battery nearing life. SMBus protocol: Read word
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Output: Unsigned integer-count total charge removed from battery over life. Units: cycle Range: 65,534 cycles; 65,535 indicates battery experienced 65,535 more cycles. Granularity: cycle Accuracy: Absolute count DesignCapacity() (0x18) Description: Returns theoretical nominal capacity pack. DesignCapacity() value expressed either current (mAh discharge rate) power, discharge rate) depending setting BatteryMode()CAPACITY_MODE bit. Purpose: DesignCapacity() function used SMBus host's power management along with FullChargeCapacity() determine battery wear. power management system present this information user also adjust power policy result. SMBus protocol: Read word Output: Unsigned integer-battery capacity units mWh.
BATTERY MODES CAPACITY_MODE Units Range Granularity Accuracy 0-65,535 applicable applicable CAPACITY_MODE 0-65,535 applicable applicable
DesignVoltage() (0x19) Description: Returns theoretical voltage pack (mV). bq2084-V140 sets DesignVoltage() value programmed Design Voltage 0x04-0x05. Purpose: DesignVoltage() function used give additional information about particular smart battery expected terminal voltage. SMBus protocol: Read word Output: Unsigned integer-the battery's designed terminal voltage Units: Range: 65,535 Granularity: applicable Accuracy: applicable SpecificationInfo() (0x1a) Description: Returns version number smart battery specification battery pack supports, well voltage current scaling information packed unsigned integer. Power scaling product voltage scaling times current scaling. SpecificationInfo() packed following fashion: (SpecID_H 0x10 SpecID_L) (VScale IPScale 0x10) 0x100. bq2084-V140 VScale (voltage scaling) IPScale (current scaling) should always zero. bq2084-V140 sets SpecificationInfo() value programmed Specification Information 0x06-0x07. Purpose: SpecificationInfo() function used SMBus host's power management system determine what information smart battery provide. SMBus protocol: Read word Output: Unsigned integer-packed specification number scaling information:
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FIELD SpecID_L SpecID_H VScale IPScale
BITS USED 8.11 12.15
FORMAT 4-bit binary value 4-bit binary value 4-bit binary value 4-bit binary value 0-15 0-15
ALLOWABLE VALUES
(multiplies voltage VScale) (multiplies current IPScale)
ManufactureDate() (0x1b) Description: This function returns date cell pack manufactured packed integer. date packed following fashion: (year-1980) month day. bq2084-V140 sets ManufactureDate() value programmed Manufacture Date 0x08-0x09. Purpose: ManufactureDate() provides system with information that used uniquely identify particular battery pack when used along with SerialNumber(). SMBus protocol: Read word Output: Unsigned integer-packed date manufacture:
FIELD Month Year BITS USED 9.15 FORMAT 5-bit binary value 4-bit binary value 7-bit binary value ALLOWABLE VALUES 0-31 (corresponds date) 1-12 (corresponds month number) 0-127 (corresponds year biased 1980)
SerialNumber() (0x1c) Description: This function used return serial number. This number, when combined with ManufacturerName(), DeviceName(), ManufactureDate(), uniquely identifies battery (unsigned integer). bq2084-V140 sets SerialNumber() value programmed Serial Number 0x0a-0x0b. Purpose: SerialNumber() function used identify particular battery. This important systems that powered multiple batteries where system information about each battery that encounters. SMBus protocol: Read word Output: Unsigned integer ManufacturerName() (0x20) Description: This function returns character array containing battery manufacturer's name. example, MyBattCo identifies smart battery manufacturer MyBattCo. bq2084-V140 sets ManufacturerName() value programmed Manufacturer Name 0x0e-0x19. When Misc Configuration SSTRING then extended manufacturer name data flash appended (0x151-0x15f). Purpose: ManufacturerName() function returns name smart battery manufacturer. manufacturer's name displayed SMBus host's power management system display both identifier advertisement manufacturer. name also useful part information required uniquely identify battery. SMBus protocol: Read block Output: String-character string with maximum length characters length byte). DeviceName() (0x21) Description: This function returns character string that contains battery name. example, DeviceName() bq2084-V140 indicates that battery model bq2084-V140. bq2084-V140 sets DeviceName() value programmed Device Name 0x1a-0x21. When Misc Configuration SSTRING then extended device name data flash appended (0x141-0x14f) Purpose: DeviceName() function returns battery name identification purposes. SMBus protocol: Read block Output: String-character string with maximum length characters length byte).
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DeviceChemistry() (0x22) Description: This function returns character string that contains battery chemistry. example, DeviceChemistry() function returns NiMH, battery pack contains nickel metal hydride cells. bq2084-V140 sets DeviceChemistry() value programmed Device Chemistry 0x22-0x26. Purpose: DeviceChemistry() function gives cell chemistry information charging systems. bq2084-V140 does DeviceChemisty() values internal charge control fuel gauging. SMBus protocol: Read block Output: String-character string with maximum length characters length byte). following partial list chemistries their expected abbreviations. These abbreviations case sensitive.
CHEMISTRY Lead acid Lithium Nickel cadmium Nickel metal hydride Nickel zinc Rechargeable alkaline-manganese Zinc ABBREVIATIONS PbAc LION NiCd NiMH NiZn ZnAr
ManufacturerData() (0x23) Description: This function allows access manufacturer data contained battery (data). bq2084-V140 stores seven critical operating parameters this data area. Purpose: ManufacturerData() function used access manufacturer's data area. data fields this command reflect programming eight critical data flash locations used facilitate evaluation bq2084-V140 under various programming sets. ManufacturerData() function returns following information order: Pack Configuration, Gauge Configuration, Misc Configuration bytes), Digital Filter, Self Discharge Rate, Pack Load Estimate, Battery Low%, Near Full bytes) Status, pending threshold voltage (low byte high byte). SMBus protocol: Read block Output: Block data-data that reflects data flash programming assigned manufacturer with maximum length characters length byte).
Pack Status Pack Configuration (0x2f)
This function returns pack status pack configuration registers. pack status register contains number status bits relating bq2084-V140 operation. pack status register least significant byte word. pack configuration register reflects bq2084-V140 configured defined value programmed Pack Configuration 0x28. pack status register consists following bits:
PRES EDV2 AFEFAIL CVOV CVUV
PRES PRES indicates that bq2084-V140 been inserted into system. bq2084-V140 system bq2084-V140 inserted into system
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EDV2 EDV2 indicates that pack cell voltage (program option) less than EDV2 threshold. indicates seal state bq2084-V140. AFEFAIL AFEFAIL indicates that communications failed. indicates present discharge cycle valid update. indicates that bq2084-V140 Flag been set. cleared only when Flag been cleared. CVOV CVOV indicates that protection limit been exceeded including Prolonged Overcurrent, Overvoltage, Overtemperature conditions. latched merely reflects present fault status. CVUV CVUV indicates that protection limit been exceeded including overload overdischarge conditions. latched merely reflects present fault status. secondary protection limits exceeded secondary protection limit exceeded secondary protection limits exceeded secondary protection limit exceeded bq2084-V140 Flag 0x00 bq2084-V140 Flag 0x66 Discharge cycle valid Discharge cycle valid communications okay. communications have failed. bq2084-V140 unsealed state. bq2084-V140 sealed state. Voltage EDV2 threshold (discharging) Voltage EDV2 threshold
VCELL4-VCELL1 (0x3c-0x3f) These functions return calculated individual cell voltages NVCELL Misc Configuration then SMBus commands changed 0x38-0x3b). alternative commands NACK'ed when selected.
DATA FLASH
General bq2084-V140 accesses internal data flash during reset when storing historical data. data flash stores basic configuration information bq2084-V140. data flash must programmed correctly proper bq2084-V140 operation.
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Memory following table shows memory data flash. shows default programming bq2084-V140. default programming reflects example data 3s2p Li-ion battery pack with 0.02- sense resistor. data flash must reprogrammed meet requirements individual applications.
DATA FLASH ADDRESS HIGH BYTE 0x00 0x02 0x04 0x06 0x08 0x0a 0x0c 0x0e 0x0f 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27 0x28 0x29 0x2a 0x2c 0x2d 0x2e 0x2f 0x30 0x32 0x34 0x31 0x33 0x35 0x2b BYTE 0x01 0x03 0x05 0x07 0x09 0x0b 0x0d NAME Remaining Time Alarm Remaining Capacity Alarm Design Voltage Specification Information Manufacture Date Serial Number Cycle Count Manufacturer Name Length Character Character Character Character Character Character Character Character Character Character Character Device Name Length Character Character Character Character Character Character Character Device Chemistry Length Character Character Character Character Manufacturer Data Length Pack Configuration Gauge Configuration Misc Configuration Digital Filter (Dead Band) Self-Discharge Rate Electronics Load Battery (MSB) Near Full Design Capacity Reserved DMODE, 4-LEDs, 4-CELL CSYNC, OTVC 9860 0.2% 7.03% 7200 LI-ION EXAMPLE minutes 14400 v1.1/PEC 1/1/2003=11809 DATA
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DATA FLASH ADDRESS HIGH BYTE 0x36 0x38 0x3a 0x3c 0x3e 0x40 0x42 0x44 0x45 0x46 0x47 0x49 0x4a 0x4b 0x4d 0x4f 0x50 0x51 0x53 0x54 0x55 0x56 0x58 0x59 0x5b 0x5d 0x5f 0x61 0x63 0x65 0x67 0x69 0x6b 0x6d 0x6f 0x71 0x73 0x75 0x77 0x79 0x7a 0x7b 0x7c 0x7e 0x80 0x81 0x82 0x7d 0x7f 0x5a 0x5c 0x5e 0x60 0x62 0x64 0x66 0x68 0x6a 0x6c 0x6e 0x70 0x72 0x74 0x76 0x78 0x57 0x52 0x4c 0x4e 0x48 BYTE 0x37 0x39 0x3b 0x3d 0x3f 0x41 0x43
NAME Full Charge Capacity Cycle Count Threshold Charging Voltage Precharge Voltage Fast-Charging Current Maintenance Charging Current Precharge Current Precharge Temperature Precharge Temperature Hysteresis Charge Inhibit Temp Charge Inhibit Temp High Fast Charge Termination Fully Charged Clear Current Taper Threshold Current Taper Qual Voltage Current Taper Window Reserved Maximum Overcharge Reserved Charge Efficiency Reserved Reserved Reserved Reserved Overload Current Over Voltage Margin Reserved Clear Fail Current Cell Over Voltage Cell Under Voltage Terminate Voltage Reserved Safety Over Voltage Charge Suspend Temp High Charge Suspend Temp High Reset Over Temperature Discharge Over Temperature Discharge Reset Safety OverTemperature Charge Safety OverTemperature Discharge Charge Suspend Temp Reserved Current Deadband Shutdown Voltage VOC75 Reserved Reserved Reserved
LI-ION EXAMPLE 7200 5200 16800 2500 2500 9.6°C 3.0°C 0.0°C 50°C 100% 100%
DATA
5000 4350 2300 11300 20000 60°C 55°C 70°C 60°C 75°C 75°C 8800 15848
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DATA FLASH ADDRESS HIGH BYTE 0x83 0x85 0x86 0x87 0x88 0x8a 0x8b 0x8c 0x8d 0x8e 0x8f 0x90 0x92 0x94 0x95 0x97 0x99 0x9b 0x9d 0x9f 0xa0 0xa1 0xa2 0xa3 0xa4 0xa5 0xa6 0xa8 0xaa 0xab 0xac 0xad 0xae 0xb0 0xb2 0xb3 0xb4 0xb5 0xb7 0xb9 0xbb 0xbd 0xbf 0xc1 0xc2 0xc3 0xc4 0xb6 0xb8 0xba 0xbc 0xbe 0xc0 0xaf 0xb1 0xa7 0xa9 0x96 0x98 0x9a 0x9c 0x9e 0x91 0x93 0x89 BYTE 0x84
NAME VOC50 Reserved Reserved Reserved VOC25 Reserved Reserved Reserved Reserved Voltage Average Time Correction Current Limit Reserved Reserved Reserved EMF/EDV0 Factor/EDV1 Factor/EDV2 Factor Factor Factor Factor Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Learning Temp Reserved Reserved Reserved Reserved Reserved Reserved Const Const Const Const Const Reserved Reserved State Control Function Control Cell Select
LI-ION EXAMPLE 15240
DATA
15024
3000 3250 3400
11.9°C
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DATA FLASH ADDRESS HIGH BYTE 0xc5 0xc6 0xc7 0xc8 0xc9 0xcb 0xcd 0xcf 0xd1 0xd2 0xd4 0xd5 0xd6 0xd7 0xd8 0xda 0xdc 0xdd 0xdf 0xe0 0xe2 0xe4 0xe6 0xe8 0xea 0xec 0xed 0xee 0xf0 0xf2 0xf4 0xf6 0xf8 0xfa 0xfb 0xfc 0xfd 0xfe 0xff 0x101 0x103 0x105 0x107 0x109 0x100 0x102 0x104 0x106 0x108 0x10a 0xef 0xf1 0xf3 0xf5 0xf7 0xf9 0xe1 0xe3 0xe5 0xe7 0xe9 0xeb 0xde 0xd9 0xdb 0xd3 0xca 0xcc 0xce 0xd0 BYTE
NAME Overload Overload Delay Short Circuit Charge Short Circuit Discharge Vref* Delta* Delta* Offset* Offset* Offset* Board Offset* Reserved Reserved Reserved Version Reserved Cell Over Voltage Reset Cell Under Voltage Reset Fail Limit Reserved Cell Balance Thresh Cell Balance Window Cell Balance Cell Balance Interval Cell Imbalance Threshold Balance Vcell Balance Imax Reserved Reserved Reserved Battery (LSB) Check Time Sleep Current Thresh Sleep Current Multiplier Sleep Time Manufacturer Info Manufacturer Info Manufacturer Info Vmax Charge Voltage Voff Charge Voltage Charge Voltage
LI-ION EXAMPLE
DATA
9750 0.02 0.0000323
Sense Resistor Gain*
Reserved
49701
Temperature Offset*
4150 3000 counts 3900 7.03 counts 4280 4280 4200
Reserved locations must shown. Locations marked with typical calibration values that adjusted maximum accuracy. these locations, table shows appropriate default initial setting. Reserved locations must shown. Locations marked with typical calibration values that adjusted maximum accuracy. these locations, table shows appropriate default initial setting. Submit Documentation Feedback
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DATA FLASH ADDRESS HIGH BYTE 0x10b 0x10d 0x10f 0x111 0x113 0x115 0x117 0x119 0x11b 0x11d 0x11e 0x11f 0x120 0x121 0x123 0x125 0x127 0x129 0x12a 0x12c 0x12d 0x12f 0x130 0x131 0x133 0x134 0x135 0x137 0x139 0x13a 0x13c 0x13e 0x140 0x141 0x150 0x151 0x160 0x161 0x162 0x163 0x165 0x164 0x15f 0x14f 0x136 0x138 0x132 0x12e 0x12b 0x122 0x124 0x126 0x128 BYTE 0x10c 0x10e 0x110 0x112 0x114 0x116 0x118 0x11a 0x11c
NAME Pulse Time Pulse Time Charge Time Precharge Detection Current Charge Detection Current Discharge Detection Current Reserved Reserved Reserved Permanent Fail Status Permanent Fail Flag Permanent Fail Config Permanent Fail Input Time Reserved Reserved Fail Charge Current Fail Discharge Current Fail Time Charge Threshold Charge Time Discharge Threshold Discharge Time Fault Reset Time VPACK Threshold Shutdown Timer Cell Imbalance Time Reserved EDV0 Misc Configuration Reserved Reserved Reserved Device Name Length Device Name Manufacturer Name Length Manufacturer Name Recovery Holdoff Over Temperature Time Reserved Reserved
LI-ION EXAMPLE 0.125 7200 -150
DATA
4000 10970 3000mV
bytes bytes
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ADDITIONAL PROGRAMMING INFORMATION ADDITIONAL DATA FLASH PROGRAMMING
following sections describe function each data flash location data stored.
Fundamental Parameters
Sense Resistor Value 32-bit Delta 0xcd-0xd0 corrects coulomb counter sense resistor variations. represents gain factor coulomb counter. 16-bit Sense Resistor Gain 0xcb-0xcc scales each integrating converter conversion mAh. Current() related measurement Sense Resistor Gain based resistance series sense resistor. following formula computes nominal starting value Sense Resistor Gain from sense resistor value Sense Resistor Gain 306.25/Rs
RSNS Value Sense Resistor Gain 61250 30625 15312
offset offset 0xd2-0xd3, contains offset coulomb counter. automatically updated when pack conditions sleep, before enters sleep mode. offset offset 0xd4, contains offset pack ground reference. automatically updated when pack conditions sleep, before enters sleep mode. offset offset 0xd5, contains offset converter. automatically updated when pack conditions sleep, before enters sleep mode. Digital Filter desired digital filter threshold, (V), value stored Digital Filter 0x2c. Digital Filter
CELL PACK CHARACTERISTICS
Battery Pack Capacity Voltage Pack capacity units stored Design Capacity, 0x32-0x33. mode, bq2084-V140 copies Design Capacity DesignCapacity(). mode, bq2084-V140 multiplies Design Capacity Design Voltage 0x04-0x05 calculate DesignCapacity() scaled mWh. Design Voltage stored initial value Full Charge Capacity, mAh, stored 0x36-0x37. Full Charge Capacity modified over course pack usage reflect cell aging under particular conditions. bq2084-V140 updates Full Charge Capacity after capacity learning cycle. Remaining Time Alarm Capacity Alarm Remaining Time Alarm 0x02-0x03 alarm thresholds used SMBus command codes 0x01 0x02, respectively. Remaining Time Alarm stored minutes Remaining Capacity Alarm units mWh, depending BatteryMode() setting.
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Cycle Count Initialization Cycle Count 0x0c-0x0d stores initial value CycleCount() function. should programmed 0x0000. Cycle Count Threshold Cycle Count Threshold 0x37-0x38 sets number that must removed from battery increment CycleCount(). Cycle Count threshold 16-bit value stored mAh. Charge Efficiency bq2084-V140 applies efficiency factor, EFF%, charge added battery. EFF% encoded Charge Efficiency 0x54 according following equation: Charge Efficiency (EFF% 2.56-1)
PACK OPTIONS
Pack Configuration Pack Configuration 0x28 contains bit-programmable features.
DMODE LED1 LED0
DMODE DMODE determines whether outputs indicate AbsoluteStateOfCharge() RelativeStateOfCharge(). LEDs reflect AbsoluteStateOfCharge() LEDs reflect RelativeStateOfCharge()
LED1-LED0 bits number LEDs Remaining Capacity indication. enables/disables transmissions smart battery host master mode alarm messages. enables/disables transmissions smart battery charger master mode messages. enables/disables master mode broadcasts bq2084-V140. Broadcasts host charger enabled Broadcasts host charger disabled byte broadcasts charger byte broadcasts charger byte alarm warning host byte alarm warning host Configures bq2084-V140 five LEDs Configures bq2084-V140 three LEDs Configures bq2084-V140 four LEDs Configures bq2084-V140 five LEDs
set, modifications bits BatteryMode() re-enable broadcasts.
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CC1-CC0 bits configure bq2084-V140 number series cells battery pack. Configures bq2084-V140 four series cells Configures bq2084-V140 three series cells Configures bq2084-V140 series cells
Gauge Configuration Gauge Configuration 0x29 contains bit-programmable features:
FEDV0 CSYNC CEDV EDVV OVSEL VCOR OTVC
FEDV0 When this set, EDV0 voltage fixed while EDV1 EDV2 left compensated values CEDV also set. When this set, compensated values EDV1 EDV2 limited from going below EDV0. EDV0 acted upon CEDV setting EDV0 fixed regardless CEDV setting
CSYNC usual operation bq2084-V140, CSYNC that coulomb counter adjusted when fast charge termination detected. some applications, especially those where externally controlled charger used, desirable adjust coulomb counter. these cases CSYNC should cleared. enables learning cycle optimization Smart Charger independent charge. CEDV CEDV determines whether bq2084-V140 implements automatic compensation calculate EDV0, EDV1, EDV2 thresholds base rate, temperature, capacity. cleared, bq2084-V140 uses fixed values programmed data flash EDV0, EDV1, EDV2. set, bq2084-V140 calculates EDV0, EDV1, EDV2. EDVV EDVV selects whether termination done with regard Voltage lowest single-cell voltage. OVSEL OVSEL determines Safety Over Voltage based Voltage highest cell voltages.
bq2084-V140 does alter time valid charge termination. bq2084-V140 updates with programmed percentage valid charger termination.
Learning cycle optimized
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