Provides Accurate Measurement Available Capacity Nicd NiMH Batter

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Provides Accurate Measurement Available Capacity Nicd NiMH Batter

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bq2016 GAUGE HIGH DISCHARGE RATES
Provides Accurate Measurement
Available Capacity Nicd NiMH Batteries Measures Wide Dynamic-Current Range Requires Square Inch Space Easy Pack Integration Measures Charge Flow Using Low-Offset V-to-F Converter Automatically Compensates Measurements Rate Temperature Supports LEDs Remaining Capacity Indication Provides 1-Wire Communication Interface Packaging: 28-Pin SSOP
TSSOP PACKAGE (TOP VIEW)
DISP LED1 LED2 LED3 LED4 LED5
PROG VPFC THON CVON
description
connect
bq2016 gauge battery pack in-system installation maintains accurate record available battery capacity. integrate charge discharge activity battery, monitors voltage drop across sense resistor connected series with cells battery. bq2016 compensates battery temperature, charge/discharge rate, battery self-discharge charge counter provide availablecapacity information across wide range operating conditions. bq2016 works with NiCd NiMH battery packs that have capacity that designed high discharge rate applications such power tools. VPFC input sets initial full charge reference battery pack. bq2016 learns true discharge capacity battery pack automatically updates full-charge reference during course discharge cycle from full empty. remaining capacity reported ratio between actual discharge capacity full-charge capacity. bq2016 communicates available capacity using LEDs 1-wire communications port. 1-wire serial communication port (5Kb/s) allows external processor read write internal registers bq2016. Communication with bq2016 useful pack testing host processing available battery information. internal registers include available battery capacity, voltage, temperature, current, battery status. input maintains register event pack voltage collapse high discharge pulse. bq2016 circuit operate from cells pack. output external provide simple, inexpensive voltage regulator supply power circuit from cells
OPTIONS -20°C 70°C 28-PIN SSOP PACKAGE bq2016DBQ bq2016DBQR
Please aware that important notice concerning availability, standard warranty, critical applications Texas Instruments semiconductor products disclaimers thereto appears this data sheet.
Copyright 2002, Texas Instruments Incorporated
PRODUCTION DATA information current publication date. Products conform specifications terms Texas Instruments standard warranty. Production processing does necessarily include testing parameters.
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Terminal Functions
TERMINAL NAME LED1-LED5 CVON VPFC SR2-SR1 DISP PROG THON 10-14 21,22 DESCRIPTION Serial communication input/output. Open-drain bidirectional communications port. Register backup input provides backup potential bq2016 registers during periods operating voltage. accepts storage capacitor battery input. Regulator output provides reference control n-JFET regulation bq2016 from battery potential. Supply voltage input Ground display segment outputs that each drive external LED. Cell voltage divider control. Output connect voltage divider voltage input during measurement. Program capacity input. 16-level input program initial battery full-charge reference. Battery voltage input. Input connection monitor battery-pack voltage. Sense resistor inputs. Input connections small value sense resistor monitor battery charge discharge current flow. Current sense voltage input monitor instantaneous current. Display activation input that activates drivers LED1-LED5. Temperature sense input connects external thermistor should grounded when using internal thermistor. function depends state PROG input. Program input defines temperature measurement thermistor (internal external). Thermistor bias control output control switch series with optional external thermistor. connect. proper device operation, these pins should connected.
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absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Relative VSS: -0.3 (All other pins) -0.3 Operating temperature, TOPR -20°C 70°C
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.
electrical characteristics
PARAMETER VOLS VOLS VILS VIHS VRBI ZAI1 ZAI2 Supply voltage Operating current Sink voltage: LED1-LED5 Sink voltage: ION, CVON Input voltage DISP Input voltage high DISP Output voltage Input voltage Input voltage high Input voltage range PROG, VPFC, data-retention input current data-retention voltage Input impedance: SR1, Input impedance: 0-1.25V 0-1.25V VRBI -0.3 VSS-0.3 IOLS IOLS -0.3 TEST CONDITIONS 0.36 UNIT
ZAI3 Input impedance: PROG, VPFC 0-VCC NOTE: specifications reference numbers based process data.
characteristics, 3.1-3.5 TOPR 70°C (unless otherwise noted)
PARAMETER VSROS VSRCOS Input voltage range, VSR2 VSR1 input offset Calibrated offset Integral nonlinearity error TEST CONDITIONS VSR2 VSR1 VSR2 VSR1, autocorrection disabled After autocorrection TOPR 50°C -0.25 -300 0.25 0.21% UNIT
characteristics
PARAMETER IREG controlled output voltage output current TEST CONDITIONS JFET: Rds(on) (off) UNIT
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serial communication timing parameters
PARAMETER t(CYCH) t(CYCB) t(STRH) t(STRB) t(DSU) t(DSUB) t(DH) t(DV) t(SSU) t(SSUB) t(RSPS) t(B) t(BR) Cycle time, host bq2016 (write) Cycle time, bq2016 host (read) Start hold, host bq2016 (write) Start hold, bq2016 host (read) Data setup time Data setup time Data hold time Data valid time Stop setup time Stop setup time Response time, bq2016 host Break Break recovery TEST CONDITIONS UNIT
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timing requirements
t(BR) t(B)
Figure Break Timing
Write Write t(STRH) t(DSU) t(DH) t(SSU) t(CYCH)
Figure Host bq2016
Read Read t(STRB) t(DSUB) t(DV) t(SSUB) t(CYCB)
Figure bq2016 Host
Written Host bq2016 CMDR Break Received Host from bq2016 Data (NAC)
t(RSPS)
00000011
Figure Typical Communication With bq2016
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functional description
general operation bq2016 determines battery capacity monitoring amount charge input removed from rechargeable battery. bq2016 measures charge discharge currents, estimates self-discharge, monitors battery voltage capacity thresholds. bq2016 automatically compensates charge discharge currents rate temperature adjust battery efficiency under different conditions. bq2016 configured display capacity relative display mode. display mode uses last measured discharge learned capacity battery battery-full reference. display activated push-button connected DISP input when bq2016 detects charge discharge rate. measurements bq2016 uses fully differential, dynamically balanced voltage-to-frequency converter (VFC) charge measurement delta sigma analog-to-digital converter (ADC) battery voltage, current, temperature measurement. charge discharge counting measures charge discharge flow battery monitoring small-value sense resistor between SR2. measures bipolar signals magnitude. bq2016 detects charge activity when VSR2 VSR1 positive discharge activity when VSR2 VSR1 negative. bq2016 integrates signal over time using internal counter. bq2016 accumulates charge discharge rate 3.125 µVh. digital filter calibration bq2016 does integrate charge discharge counts below digital filter threshold. digital filter threshold until calibration performed. calibration performed after first valid charge after initialization. takes minutes begin calibration minutes complete calibration. bq2016 suspends calibration while detects charge discharge activity during this period. After successful calibration, digital filter threshold voltage monitoring thresholds conjunction with monitoring charge discharge currents, bq2016 monitors battery pack potential through pin. bq2016 measures pack voltage reports result battery voltage (VSBH:L) register. bq2016 converts signals input every seconds. input divided down from cells using tolerance resistors. reduce current consumption from battery, CVON output switch divider cells only during measurement period. CVON high impedance when cells measured, driven otherwise. full-scale input 1.25 bq2016 monitors voltage end-of-discharge voltage (EDV) maximum voltage (MCV) thresholds. bq2016 uses threshold level determine when battery reached empty state, threshold level detect fault condition during charge. input levels 0.45 1.00 bq2016 disables monitoring greater than overload threshold. bq2016 detects overload threshold, bq2016 sets OLVD flag secondary status flags (FLAGS2) register. bq2016 resumes detection after drops back below overload threshold. overload threshold function battery capacity defined table.
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functional description (continued)
current input bq2016 measures battery charge discharge current. input converts current signal from series sense resistor every seconds stores result current scale register (VSRH:L). full scale input range limited ±250 shown Table Table Input Range
SENSE RESISTOR FULL SCALE INPUT (±A)
temperature bq2016 measures temperature, either with internal thermistor with external thermistor, depending state PROG input. bq2016 accepts external thermistor input. bq2016 samples input voltage every seconds stores voltage Input Voltage (TEMPVH:L) register actual temperature temperature (TEMP) register. With external thermistor, bq2016 develops temperature value temperature register basis Semitec 103AT (10K) model. bq2016 reports temperature steps with accuracy external internal thermistor, respectively. temperature reading used adapt remaining capacity charge discharge efficiency adjust battery's self discharge. internal thermistor selected temperature measurement, input should grounded. THON used connect bias source thermistor when bq2016 samples input. THON high impedance when temperature measured, driven otherwise. gauge operation general operational overview diagram Figure illustrates operation bq2016. bq2016 accumulates measure charge discharge currents estimates self-discharge. bq2016 compensates charge discharge currents rate temperature efficiencies. also adjusts self-discharge estimation temperature variation. bq2016 stores compensated charge accumulation nominal available capacity (NAC) register. indication, bq2016 adjusts battery pack operating temperature. discharge count register (DCR) tracks discharge activity battery. last measured discharge (LMD) represents discharge capacity learned full capacity battery application. bq2016 transfers value when qualified discharge occurs.
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functional description (continued)
Inputs Charge Current Discharge Current Self-Discharge Timer
Rate Temperature Compensation
Rate Temperature Compensation
Temperature Compensation
Main Counters Capacity Reference (LMD)
Nominal Available Charge (NAC)
Last Measured Discharge (LMD)
Qualified Transfer
Discharge Count Register (DCR)
Temperature Translation
Temperature, Voltage, Other Data
Outputs Chip-Controlled Available Charge Display Serial Port
Figure Operational Overview Diagram main gauge registers programmed full count (PFC) programmed full count (PFC) register stores user-specified battery full capacity. 8-bit registers stores full capacity scaled shown Table VPFC input sets value counting scale bq2016 initialization (power reset). nominal available capacity (NAC) main counter, NAC, represents available battery capacity given time. Battery charging increments register, while battery discharging self-discharge decrement register. bq2016 compensates charge discharge inputs rate temperature efficiencies. counts during charge maximum value down during discharge self-discharge bq2016 resets initialization when bq2016 sets discharge. prevent overstatement charge during periods overcharge, stops incrementing when LMD.
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main gauge registers (continued) calibration bq2016 sets when detects transition from fast-charge trickle charge provided that when bq2016 detects transition. this determination, fast-charge detection (FCDT) corresponds FCDT value PROG pin. Fast-charge detection occurs when FCDT condition after CHGS FLGS1. Once fast-charge activity qualified, transition signal below FCDT threshold enables trickle-charge detection. bq2016 verifies trickle charge continuing sample input signals above trickle-charge threshold below fast-charge threshold. This sampling take minutes. Once trickle-charge verified, bq2016 adjusts between LMD. greater then LMD, unchanged upon transition detection. last measured discharge (LMD) Last measured discharge most recent measured discharge capacity battery. initialization, bq2016 sets PFC. When valid charge detected following valid discharge, bq2016 updates with current value DCR. During subsequent discharges, bq2016 updates with current value DCR. (The value represents measured discharge capacity battery from full threshold.) bq2016 limits adjustment down previous value. qualified discharge necessary capacity transfer from register. register also serves 100% reference threshold used display mode. discharge count register (DCR) discharge count register (DCR) used update last measured discharge register only complete battery discharge from full empty occurs without partial battery charges. this way, bq2016 adapts capacity determination based actual conditions discharge. counts during discharge independent continue increase after decrements Before (empty battery), both discharge self-discharge increment DCR. After only discharge increments DCR. resets when primary status flags register (FLAGS1) charge. bq2016 sets VDQ=1 fast charge-to-trickle detection greater than when NAC=LMD. does roll over stops counting when reaches ffffh. value becomes value first valid charge after discharge threshold bq2016 detects qualified discharge. valid charge minimum (maximum two) increments. qualified discharge occurs
valid charge initiations occurred during period between when gets charge when
bq2016 detects discharge.
self-discharge count more than PFC. temperature greater than equal when level reached during discharge. gets set.
indicates whether present discharge valid update. programming bq2016 bq2016 programmed with VPFC PROG pins. During power-up initialization, bq2016 reads state these multilevel inputs latches programmable configuration settings. Resistor divider networks VPFC PROG should target nominal thresholds defined programming tables.
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programmable configuration settings design capacity battery's rated design capacity programmed full count (PFC) programmed with VPFC shown Table represents battery's full reference. VPFC 16-level input. Table Selections
LEVEL LOWER 0/32 2/32 4/32 6/32 8/32 10/32 12/32 14/32 16/32 18/32 20/32 22/32 24/32 26/32 28/32 30/32 NOMINAL THRESHOLD (VCC) 1/32 3/32 5/32 7/32 9/32 11/32 13/32 15/32 17/32 19/32 21/32 23/32 25/32 27/32 29/32 31/32 UPPER 2/32 4/32 6/32 8/32 10/32 12/32 14/32 16/32 18/32 20/32 22/32 24/32 26/32 28/32 30/32 32/32 (COUNT) 30720 25344 41472 33792 27648 46080 36864 30720 39936 46080 27648 33792 39936 47616 28416 33792 SCALE (mVh/ COUNT) 1/2560 1/2560 1/5120 1/5120 1/5120 1/10240 1/10240 1/10240 1/10240 1/10240 1/5120 1/5120 1/5120 1/5120 1/2560 1/2560 CAPACITY (mVh) 12.0 11.1 13.2 OVERLOAD THRESHOLD (mV) Open 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 Open CHEMISTRY NiCd NiCd NiCd NiCd NiCd NiCd NiCd NiCd NiMH NiMH NiMH NiMH NiMH NiMH NiMH NiMH
correct determined multiplying rated battery capacity sense-resistor value: Battery capacity (mAh) sense resistor (mVh) Selecting slightly less than rated capacity provides conservative capacity reference. bq2016 stores selected register.
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programmable configuration settings (continued) internal external thermistor PROG programs whether bq2016 uses internal external thermistor according following table. also defines fast charge trickle-rate detection thresholds calibration. Table PROG Selections
PROG LEVEL 0/12 2/12 4/12 6/12 8/12 10/12 (VCC) 1/12 3/12 5/12 7/12 9/12 11/12 2/12 4/12 6/12 8/12 10/12 12/12 TRICKLE RATE VDMF VDMF CRate VDMF VDMF CRate FAST CHARGE DETECTION THRESHOLD (FCDT) CRate CRate Open 1000 1000 1000 1000 Open
NOTE: bq2016 does perform calibration charge with options VDMF uncalibrated calibrated.
programming example Given: Sense resistor 0.003 Chemistry NiCd Capacity 2000 Discharge current range Charge current Voltage drop over sense resistor Internal thermistor with FCDT Therefore 2000 0.003 Select VPFC level PROG level grounded initial full battery capacity (1800 mAh) until bq2016 learns capacity with qualified discharge from full EDV. charge discharge count counting charge counting bq2016 detects charge activity when VSR2 VSR1 greater than digital filter threshold. charge activity detected, bq2016 increments rate proportional activates display Charge actions increment after compensation charge rate temperature. Charge counting continues until drops below VDMF. discharge counting bq2016 detects discharge activity when VSR2 VSR1 more negative than digital filter threshold. discharge activity detected, bq2016 decrements increments rate proportional activates display Discharge actions decrement increment after compensation discharge rate temperature. Discharge counting continues until rises above -VDMF.
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charge discharge count counting (continued) self-discharge estimation bq2016 continuously decrements increments self-discharge based time temperature. self-discharge count rate programmed nominal 1/80 rate NiCd nominal 1/60 NiMH. This rate battery whose temperature between 20°C-30°C. self-discharge rate doubles every 10°C increase temperature. count compensations bq2016 compensates charge discharge counting temperature rate before updating and/or DCR. bq2016 compensates self-discharge estimation temperature before updating DCR. charge compensations bq2016 compensates charge efficiencies quick-charge fast-charge rate different temperature thresholds. bq2016 applies NiCd NiMH factors based VPFC setting. charge compensation, quick charge defined charge rate less fast charge defined rate greater than C/5. charge-compensation factors shown Tables charge compensations Table Charge Compensation NiCd
CHARGE TEMPERATURE <40C QUICK CHARGE COMPENSATION 0.80 0.75 FAST CHARGE COMPENSATION 0.95 0.90
Table Charge Compensation NiMH
CHARGE TEMPERATURE <40C QUICK CHARGE COMPENSATION 0.80 0.75 FAST CHARGE COMPENSATION 0.90 0.85
discharge compensation bq2016 corrects rate discharge adjusting internal discharge-compensation factor. discharge factor based calculated discharge rate determined from potential setting. table below shows compensation factors NiCd NiMH during discharge:
DISCHARGE RATE >12C DISCHARGE EFFICIENCY
NOTE: Rate determination made from LMD.
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discharge compensation (continued) bq2016 adjusts discharge-compensation efficiency temperature. lower temperatures, discharge-efficiency factor decreases each 10°C temperature step below 10°C. (new) where number 10°C steps below 10°C. example discharge, 10°C: 10°C: -10°C 0°C: -20°C -10°C: -20°C -30°C: error summary capacity inaccurate susceptible error initialization updates occur. initialization, value includes error between programmed full capacity actual capacity. This error present until valid discharge occurs updated. other cause error battery wear-out. battery ages, measured capacity must adjusted account changes actual battery capacity. bq2016 increments capacity inaccurate count (CPI) register each time valid charge occurs reset whenever updated from DCR. counter does wrap around stops counting 255. capacity inaccurate flag (CI) been updated following valid charges. display bq2016 directly display capacity information using low-power LEDs. bq2016 displays battery charge percentage LMD. capacity display also adjusted present battery temperature. temperature adjustment reflects available capacity given temperature does affect register. Tables show temperature adjustments: Table Temperature Translation NiCd
TEMPERATURE TEMPERATURE TRANSLATION
FDE(NEW) 100% FDE(NEW) FDE(NEW) FDE(NEW) FDE(NEW)
Table Temperature Translation NiMH
TEMPERATURE TEMPERATURE TRANSLATION
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error summary (continued) display becomes active during charge registers counting rate equivalent discharge registers counting rate equivalent When DISP pulled low, segment output becomes active seconds. LED1 blinks 4-Hz rate whenever less than VEDV. Table Display Mode
LED1 BLINK BLINK LED2 LED3 LED4 LED5 100% VEDV
input input should used with storage capacitor external supply provide backup potential internal bq2016 registers when drops below output when above external supply (such bottom series cell) backup source, then external diode required isolation. initialization bq2016 initialized removing grounding seconds command over serial port. port reset command requires writing register CMDWD. microregulator output provided regulate external low-threshold JFET supply power bq2016 based circuit from series cells. output maintains bq2016 communicating with bq2016 bq2016 includes simple single-pin (HDQ referenced Vss) serial data interface. host processor uses interface access various bq2016 registers. adding single contact battery pack, host easily monitor battery characteristics. open-drain bq2016 should pulled host system pulled down ground. interface uses command-based protocol, which host processor sends command byte bq2016. command directs bq2016 either store next eight bits data received register specified command byte output eight bits data specified command byte. communication protocol asynchronous return-to-one. Command data bytes consist stream eight bits that have maximum transmission rate bits/s. least-significant command data byte transmitted first. protocol simple enough that implemented most host processors using either polled interrupt processing. Data input from bq2016 sampled using pulse-width capture timers available some microcontrollers. communication error occurs (e.g., tCYCB 250µs), bq2016 should sent BREAK reinitiate serial interface. BREAK detected when driven logic-low state time greater. should then returned normal ready-high logic state time tBR. bq2016 ready receive command from host processor.
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communicating with bq2016 (continued) return-to-one data frame consists three distinct sections. first section used start transmission either host bq2016 taking logic-low state period tSTRH;B. next section actual data transmission, where data should valid period tDSU;B, after negative edge used start communication. data should held period tDH;DV, allow host bq2016 sample data bit. final section used stop transmission returning logic-high state least period tSSU;B, after negative edge used start communication. final logic-high state should continue during period tCYCH;B, allow time ensure that transmission stopped properly. timings data break communication given serial communication timing specification illustration sections. communication with bq2016 least-significant always transmitted first. command code registers bq2016 status registers listed Table described below. command code bq2016 latches command code when eight valid command bits have been received bq2016. command code contains fields:
Command address
command code determines whether received command read write function. command code (continued) bq2016 outputs requested register contents specified address portion command code. host writes register specified address portion command code.
lower seven-bit field command code contains address portion register accessed. bq2016 ignores writes invalid addresses. registers FLAGS1 (0x01) Primary Status Flags FLAGS1 register provides bq2016 status information. 8-bit register includes following status bits:
CHGS RSVD
CHGS bq2016 CHGS when detects charge activity. bq2016 clears CHGS discharge. Condition bq2016 detects discharge. bq2016 detects charge. bq2016 sets when performs full reset.
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registers (continued) bq2016 sets when detects that maximum cell voltage threshold being exceeded. Condition Cell voltage below threshold. Cell voltage above threshold. bq2016 sets reset when register exceeds Condition update occurred. bq2016 been reset register exceeds bq2016 sets when present discharge cycle considered valid update. Condition present discharge cycle valid update. present discharge cycle valid update. reserved. bq2016 sets when battery voltage drops below threshold. latched remains until valid charge activity detected. Condition battery voltage greater than threshold. battery voltage less than threshold.
bq2016 sets when offset calibration been performed. Condition Offset calibration completed Offset calibration completed TEMP (0x02) Temperature TEMP register contains battery temperature computed using internal temperature sensor bq2016. represented degrees data 8-bit signed integer. example, -10°C represented F6h. (0x03) Nominal Available Capacity 8-bit register that contains present remaining capacity battery pack. contents compensated rate temperature. data represented same units PFC. (0x05) Last Measured Discharge stores learned discharge capacity battery pack represents full charge reference. 8-bit register presents data same units PFC. FLAGS2 (0x06) Second Status Flags FLAGS2 register provides bq2016 status information. 8-bit register includes following status bits:
RSVD RSVD RSVD RSVD OVLD
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registers (continued) DR2-0 DR2-0 bits represent present discharge rate battery according following code:
DISCHARGE RATE INDICATION DISCHARGE RATE
OVLD bq2016 OVLD when detects that present discharge rate exceeds programmed overload threshold. Condition Discharge rate below overload threshold. Discharge rate above overload threshold. VPFC (0x07) VPFC Input Level VPFC stores input level VPFC programming pin. voltage VPFC (VVPFC) calculated VVPFC (mV) (VPFC/256) VPROG (0x08) VPROG Input Level VPROG stores input level VPROG programming pin. voltage VPROG (VPROG) calculated VVPROG (mV) (VPROG/256) (0x09) Capacity Input Level stores number valid charge actions since last update. OCTL (0x0a) Output Control OCTL provides means testing functionality. register consists
RSVD RSVD OCTL5 OCTL4 OCTL3 OCTL2 OCTL1 Enable
When Enable low, bq2016 writes data OCTL5-1 LED5-1 pins. OCTL5-1 turns corresponding This function overrides indication representation capacity. FULCNT (0x0b) Full Count Register FULCNT store number times battery been charged full (NAC=LMD) count increments. CMDWD (0x0c) Command Word CMDWD register used reset bq2016 initiate offset calibration. reset bq2016, 0x78 must written this location. When reset, bq2016 sets following values: FULCNT
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calibrate VFC, 0x68 must written this location. During offset calibration, bq2016 deselects inputs disables LEDs. When bq2016 successfully completes calibration, sets FLAGS1. command 0x60 terminates calibration. bq2016 automatically performs calibration after trickle detection initial power-up, when LMD. (0x0f) Programmed Full Count register stores battery design capacity defined VPFC input. (0x10 0x11) Battery Voltage VSBH (0x11) VSBL (0x10) form 16-bit register that contains voltage present input (0x12 0x13) Current Scale VSRH (0x13) VSBL (0x12) form 16-bit register that contains voltage present across inputs TEMPV (0x14 0x15) Thermistor Voltage TEMPVH (0x15) TEMPVL (0x14) form 16-bit register that contains voltage present inputs (0x18) Discharge Count Register stores cumulative discharge count from time charge. data represented same units PFC. number counts equals 256. FLAGS3 (0x4c) Third Status Flags FLAGS3 register provides bq2016 status information. 8-bit register includes following status bits:
RSVD RSVD RSVD RSVD RSVD
CR1-CR0 CR1-CR0 bits represent present charge rate battery according following code:
CHARGE RATE INDICATION CHARGE RATE RC/8 C/5R>C/8 R>C/5
bq2016 sets when detects valid charge condition. valid charge increments. Condition valid charge condition Valid charge condition present
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registers (continued) Table Command Status Registers
SYMBOL FLAGS1 TEMP FLAGS2 VPFC VPROG OCTL FCNT CMDWD VSBL VSBH VSRL VSRH TEMPVL TEMPVH FLAGS3 REGISTER NAME Primary status flags Temperature Nominal available charge Last measured discharge Secondary status flags VPFC input level PROG input level Capacity inaccurate count output control Full count register Command word Program Battery voltage (low byte) Battery voltage (high byte) Current scale (low byte) Current scale (high byte) input voltage (low byte) input voltage (high byte) Discharge count register Third status flags (HEX) 0x01 0x02 0x03 0x05 0x06 0x07 0x08 0x09 0x0a 0x0b 0x0c 0x0f 0x10 0x11 0x12 0x13 0x14 0x15 0x18 0x4c READ/ WRITE CHGS NCH7 LMD7 RSVD VPFC7 VPRO7 CPI7 FCNT7 CMD7 PFC7 VSBL7 VSBH7 VSRL7 VSRH7 TPVL7 TPVH7 DCR7 RSVD NCH6 LMD6 VPFC6 VPRO6 CPI6 FCNT6 CMD6 PFC6 VSBL6 VSBH6 VSRL6 VSRH6 TPVL6 TPVH6 DCR6 RSVD NCH5 LMD5 VPFC5 VPRO5 CPI5 OCTL5 FCNT5 CMD5 PCF5 VSBL5 VSBH5 VSRL5 VSRH5 TPVL5 TPVH5 DCR5 RSVD NCH4 LMD4 VPFC4 VPRO4 CPI4 OCTL4 FCNT4 CMD4 PFC4 VSBL4 VSBH4 VSRL4 VSRH4 TPVL4 TPVH4 DCR4 RSVD NCH3 LMD3 RSVD VPFC3 VPRO3 CPI3 OCTL3 FCNT3 CMD3 PFC3 VSBL3 VSBH3 VSRL3 VSRH3 TPVL3 TPVH3 DCR3 RSVD NCH2 LMD2 RSVD VPFC2 VPRO2 CPI2 OCTL2 FCNT2 CMD2 PFC2 VSBL2 VSBH2 VSRL2 VSRH2 TPVL2 TPVH2 DCR2 NCH1 LMD1 RSVD VPFC1 VPRO1 CPI1 OCTL1 FCNT1 CMD1 PFC1 VSBL1 VSBH1 VSRL1 VSRH1 TPVL1 TPVH1 DCR1 NCH0 LMD0 OVLD VPFC0 VPRO0 CPI0 Enable FCNT0 CMD0 PFC0 VSBL0 VSBH0 VSRL0 VSRH0 TPVL0 TPVH0 DCR0 RSVD
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APPLICATION INFORMATION bq2016 applications schematic
PACK+ MMBT3904 BZX84C5V6 SST113 0.01 0.01 PROG VPFC THON CVON 2N7002 Cells ZVP3306F
bq2016 LED1 LED2 LED3 LED4 LED5 DISP
Display
PACK-
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Provides Accurate Measurement Available Capacity Nicd NiMH Batter

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