Doug Williams Power Management Products ABSTRACT advanced battery

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Doug Williams Power Management Products ABSTRACT advanced battery

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Advanced Gauge Host Firmware Flow Chart Battery Monitor
Doug Williams Power Management Products
ABSTRACT advanced battery-monitoring ICs, such bq2018, bq2019, bq2023, designed accurately measure charge discharge currents rechargeable battery packs. Intended pack integration, these devices contain necessary functions form basis comprehensive battery capacity management system applications such cellular phones, PDAs, Internet appliances, other portable products. battery monitors work with host controller portable system implement battery gauging management system. host controller responsible interpreting battery monitor data communicating meaningful battery data end-user power management system. This document, written around bq2019, designed assist firmware engineer engaged development advanced gauging routines host controller. flow chart presented implementing gauging function host firmware. Suggested constant variable values outlined described. This document designed used conjunction with related application note Advanced Gauge Host Firmware Guide Battery Monitor (SLVA100)
Gauging Functions
Apart from required general read write functions, gauge firmware broken down into tasks table flowchart organized according these functions. Table
Name GGInitialize( power
Gauge Firmware Tasks
Description Qualify battery communication. Read convert constants scratch variables from bq2019 into host. Calculate capacity, average current, time charge time. Manage full, empty learning. Update display. register maintenance. Store remaining capacity bq2019. Clear registers. Make corrections remaining capacity self-discharge. Measure battery voltage. Call GGUpdate( battery crosses empty voltage threshold. Provide orderly shutdown. Update bq2019 registers.
Recommended Interval
GGUpdate( GGRegisterMaint( GGSelfDischarge( GGMeasBattVltg( GGPwrDwnSave(
Once minute (typical) Hourly Several times Every seconds power down
SLVA114
Gauging Constants
Table below outlines suggested constants gauge implementation. Notice that last three only used mechanism simplify calculations firmware. flowchart refers specifically many these constants. Table
Class Name
Typical Gauge Constants
Used Type/Units Description/Comment
Suggested bq2019 Address 78~7F 20~25 26~2B 2C~35 36/37 38/39 3A/3B
ID_ROM sMFG_DATA Data sMODEL sMFG_NAME iSERIAL_NO iMFG_DATE iDES_CAP
GGInitialize( GGInitialize( GGInitialize( GGInitialize( GGInitialize( GGInitialize( GGInitialize( GGUpdate( GGInitialize( GGInitialize( GGSelfDischarge GGInitialize( GGUpdate( GGMeasBattVltg( GGInitialize( GGUpdate( GGInitialize( GGUpdate( GGInitialize( GGUpdate( GGInitialize( GGInitialize( GGInitialize( GGUpdate( GGInitialize( GGUpdate( GGInitialize( GGUpdate(
bytes (str) ASCII (str) ASCII (str) ASCII (uint) (uint) Date (uint) Milliampere Hours (uint) 327.68
Factory programmed Manufacturers data Battery model Manufacturer name Serial number Manufactured date Pack design capacity
iSNS_RES
3C/3D
Sense resistor
iSLF_DSG_RATE 3E/3F iEND_DSG_VLTG 40/41
(uint) %/Day Self discharge rate 105.8 (uint) Millivolts discharge voltage
iTERM_CURR Design Data iCAP_COMP_TE iCAP_COMP_LD iTALK_LD iSTBY_LD iTALK_LD_CNTS iSTBY_LD_CNTS iCYCL_CAP
42/43
(uint) Charge taper termination Milliamperes current (byte) full capacity (byte) full capacity (uint) (uint) Counts 3.05 Counts 3.05 Capacity compensation temperature Capacity compensation load current Estimated talk load Estimated standby load iSNS_RES iTALK_LD 1000 iSNS_RES iSTBY_LD 1000
(uint) used simplify math iDES_CAP GGUpdate( iSNS_RES* 0.8/1000
Addresses hex. indicates that values maintained host since they function battery. ID_ROM fixed address bq2019.
Advanced Gauge Host Firmware Flow Chart Battery Monitor
SLVA114
Gauging Variables
Table below outlines suggested variables memory addresses gauge implementation. flowchart refers specifically most these values. Table
Class Name
Typical Gauge Variables
Used Type/Units Description/Comment
Suggested bq2019 Address [2][3] 00/01
iLastMeasDsg
GGInitialize( GGUpdate( GGSelfDischarge( GGInitialize( GGUpdate( GGUpdate(
(uint) Counts Last measured discharge. 3.05 (Initial value during mfg.) (uint) Counts Remaining capacity (Initial 3.05 value during mfg.) (uint) Units Cycle count (Typically increased iDsgCntrCuml reached design capacity) temp seen this bq2019. Update host during GG_Update. Valid discharge flag. This flag, 0x55 used indicate true avoid possible corruption power down/up cycles.
iRemCap iCycleCnt
02/03 04/05
iMaxTemp
GGInitialize( GGUpdate( GGPwrDwnSave( GGInitialize( GGPwrDwnSave(
(byte) (uint) Flag
iValidDsg
iDsgCntr Computed Values iDsgCntrCuml
08/09
GGInitialize( GGUpdate( GGSelfDischarge( GGPwrDwnSave( GGInitialize( GGUpdate( GGSelfDischarge( GGPwrDwnSave( GGInitialize( GGPwrDwnSave( GGInitialize( GGUpdate( GGSelfDischarge( GGPwrDwnSave( GGInitialize( GGUpdate( GGRegisterMaint( GGUpdate(
(uint) Counts Discharge counter 3.05 learning iLastMeasDsg
0A/0B
(uint) Counts Cumulative discharge counter 3.05 tracks partial discharges iCycleCnt update. (uint) Counts Last computed remaining 3.05 capacity value (uint) Counts Tracks cumulative self@ 3.05 discharge corrections. Disqualifies learning cycle exceeds iDES_CAP. (uint) Minutes (uint) Minutes Minutes elapsed since last register maintenance. Estimated remaining time present current.
iLastRemCap iCumlCorrectn
0C/0D 0E/0F
iTimeSinceMaint
iRunTime
Advanced Gauge Host Firmware Flow Chart Battery Monitor
SLVA114
Table
Class Name
Typical Gauge Variables (Continued)
Suggested bq2019 Address [2][3] Used Type/Units Description/Comment
iTimeToFull iTalkTime iStbyTime iRelChgPercent bInit
GGUpdate( GGUpdate( GGUpdate( GGUpdate( GGInitialize( GGUpdate(
(uint) Minutes (uint) Minutes (uint) Minutes (uint) (bool) Flag
Estimated remaining time charge full. Estimated remaining time iTALK_LD Estimated remaining time iSTBY_LD Relative charge percent full charge. `RSOC' Initial pass flag. Inhibits iRunTime iTimeToFull calculations first time through GGUpdate( Flag notify other host process that battery discharge voltage. Flag used charger other host process indicate that battery fully charged. Host version iValidDsg. This flag, 0x55 used indicate true avoid possible corruption power down/up cycles. Most recent calculation remaining capacity.
bEDV
GGInitialize( GGUpdate( GGUpdate(
(bool) Flag (bool) Flag
bChgFull
iValidDsgRam
GGInitialize( GGUpdate( GGPwrDwnSave( GGInitialize( GGUpdate( GGRegisterMaint( GGSelfDischarge( GGPwrDwnSave( GGUpdate(
(uint) Flag
Computed Values iRemCapNow (int) Counts 3.05
iRemCapNowCmp
(int) Counts 3.05
load and/or temperature compensation used remaining capacity, this separate variable required most recent calculation compensated remaining capacity. Calculation remaining capacity from previous update.
iRemCapPrev
GGUpdate(
(int) Counts 3.05
iRemCapTemp iSlfDsgEst iTempCorrection fElapsedTime
GGSelfDischarge( GGSelfDischarge( GGSelfDischarge( GGUpdate(
(uint) Counts Temp variable iterative 3.05 self-discharge estimate. (uint) (uint) (float) Minutes Temp self-discharge variable. Temp self-discharge variable. Value minutes, with resolution seconds since power reset detected.
Advanced Gauge Host Firmware Flow Chart Battery Monitor
SLVA114
Table
Class Name
Typical Gauge Variables (Continued)
Suggested bq2019 Address [2][3] Used Type/Units Description/Comment
Computed Values
fElapsedTimePrev
GGUpdate(
(float) Minutes
Value minutes, with resolution seconds since power reset detected previous fElapsedTime. TMPH, TMPL bq2019 contain temperature
iKelvin (Host) TMPL (bq2019) TMPH (bq2019) iRegClr (Host) (bq2019)
GGInitialize( GGUpdate
(uint)
GGUpdate( GGRegisterMaint( GGSelfDischarge( GGInitialize( GGUpdate(
(uint) Bits
used quickly clear DCR, CCR, SCR, DTC, combination. iRegClr used host next desired clearing pattern. Charge Time Counter. used GGUpdate( timer time function available host. Discharge Time Counter. used GGUpdate( timer time function available host Self Discharge Counter. Rate varies automatically with temperature.
bq2019 Gauge Registers corresponding host vars.
iChgTime (Host) CTCL (bq2019) CTCH (bq2019) iDsgTime (Host) DTCL (bq2019) DTCH (bq2019)
(uint) 4096 counts hour (uint) 4096 counts hour (uint) count hour 30°C)
GGInitialize( GGUpdate(
iSlfDsgCntr (Host) SCRL (bq2019) SCRH (bq2019) iChgCntr (Host) CCRL (bq2019) CCRH (bq2019) iDsgCntr (Host) DCRL (bq2019) DCRH (bq2019)
GGInitialize( GGSelfDischarge(
GGUpdate( GGUpdate(
(uint) Counts Charge count register 3.05 bq2019 increments when voltage positive. (uint) Counts Discharge count register 3.05 bq2019 increments when voltage negative.
Addresses hex. [3]Gas gauge registers fixed locations.
Advanced Gauge Host Firmware Flow Chart Battery Monitor
SLVA114
GGInitialize(
Read Mfg. Data (Table Read iDsgCntrCuml
Read iChgTime Return Error Read iDsgTime
Data Valid?
Read Battery Design Data (Table
Calculate iTimeSinceMaint (iChgTime iDsgTime) 4096. (Ensure Rollover Error)
bInit flag true
Calculate iTALK_LD_CNTS
bEDV flag false
Read iValidDsg Calculate iSTBY_LD_CNTS
Calculate iCYCL_CAP iValidDsg 0x55? Write iValidDsg Case Power Glitch.)
Read iMaxTemp
iValidDsgRam 0x55 Read iLastMeasDsg
Read iDsgCntr Read iLastRemCap
Read iCumlCorrectn Read iRemCap
Read iEND_DSG_VLTG
Return
Advanced Gauge Host Firmware Flow Chart Battery Monitor
SLVA114
GGUpdate(
Read Register Into iChgCntr iRemCapNow iRemCapPrev? Read Register Into iDsgCntr
Discharging
bInit =True?
iDsgCntr iDsgCntr iRemCapPrev iRemCapNow
Read Into iKelvin
iDsgCntrCuml iDsgCntrCuml iRemCapPrev iRemCapNow
iTimeSinceMaint ITimeSinceMaint fElapsedTime fElapsedTimePrev
iKelvin iMaxTemp? iDsgCntrCuml iCYCL_CAP? iMaxTemp iKelvin Read iCycleCnt
iCycleCnt iCycleCnt fElapsedTimePrev fElapsedTime Write iCycleCnt
iRemCapNow iRemCapPrev
Read fElapsedTime From System Battery Monitor Time Registers
iDsgCntrCuml iDsgCntlCuml iCYCL_CAP
Charging
iRemCapNow iLastMeasDsg?
iRemCapPrev iRemCapNow
bInit =True?
iTimeToFull=0
iRemCapNow iRemCap iDsgCntr iChgCntr
iTimeSinceMaint=iTimeSinceMaint fElapsedTime fElapsedTimePrev iRemCapNow
iRunTime (for time thru)
iTimeToFull [fElapsedTime fElapsedTimePrev] [iLastMeasDsg iRemCapNow] [iRemCapNow iRemCapPrev]
iRunTime iValidDsgRam iRemCapNow
iTimeToFull (for time thru)
iRunTime [fElapsedTime fElapsedTimePrev] iRemCapNow [iRemCapPrev IRemCapNow]
iRemCapNow =iLastMeasDsg
Optionally, iRemCapNowCmp Temperature and/or Load Compensation. However, modify iRemCapNow.
Advanced Gauge Host Firmware Flow Chart Battery Monitor
SLVA114
GGUpdate( Continued
iRegClr 0x1F
iTimeSinceMaint iTimeSinceMaint iRemCapNow iLastMeasDsg
Call GGRegMaint
iCumlCorrectn
iValidDsgRam 0x55 iKelvin<
iValidDsgRam 0x55
iDsgCntr
iCumlCorrectn iDES_CAP
iDsgCntrCuml
iValidDsgRam
iRemCap iRemCapNow
Write iRemCap iRemCapNow iLastMeasDsg?
Battery Full
Write iRegClr
iRegClr
bChgFull True
Battery Full
Advanced Gauge Host Firmware Flow Chart Battery Monitor
SLVA114
GGUpdate( Continued
Battery Voltage From System
Battery Voltage iEND_DSG_VLTG bEDV True iRemCapNow
Voltage
iRemCapNow iRegClr
Depleted Capacity
Battery Normal
iRemCapNow
iTimeSinceMaint
iRegClr 0x1F iRemCap iRemCapNow
bEDV True
iRegClr 0x1F
iValidDsgRam 0x55
iRemCap
iDsgCntr iDsgCntr iRemCapPrev iRemCapNow
iDsgCntr Within iDES_CAP?
Write iRemCap
iLastMeasDsg iDsgCntr
Correct iLastMeasDsg Setting Down iDES_CAP
Write iRegClr
iRegClr Write iLastMeasDsg
Advanced Gauge Host Firmware Flow Chart Battery Monitor
SLVA114
GGUpdate( Continued
iTalkTime iRemCapNow iTALK_LOAD
iStbyTime iRemCapNow iSTBY_LOAD
iRelChgPercent iRemCapNow iLastMeasDsg
bInit False
Return
Advanced Gauge Host Firmware Flow Chart Battery Monitor
SLVA114
GGRegisterMaint(
iTimeSinceMaint
iRegClr 0x1B
iRemCapNow
Read Register Into iSlfDsgCntr
iSlfDsgCntr iSLF_DSG_RATE
Call GGSelfDischarge
Return
Advanced Gauge Host Firmware Flow Chart Battery Monitor
SLVA114
GGSelfDischarge(
iRemCapTemp Smaller iRemCapNow iLastMeasDsg
iTempCorrection
iSlfDsgCntr iSLF_DSG_RATE
iSlfDsgEst iRemCapTemp iSlfDsgEst iRemCapTemp [iSlfDsgCntr iSLF_DSG_RATE]
iTempCorrection iTempCorrection iSlfDsgEst
iRemCapTEmp iRemCapTemp iSlfDsgEst
iRemCapTemp iRemCapTemp iSlfDsgEst
iTempCorrection iTempCorrection iSlfDsgEst
iSlfDsgCntr iSlfDsgCntr iSLF_DSG_RATE
iRemCapNow iRemCapNow iTempCorrection
iDsgCntr iDsgCntr iTempCorrection
iDsgCntrCuml iDsgCntrCuml iTempCorrection
iCumlCorrectn iCumlCorrectn iTempCorrection
iRegClr iRegClr 0x04
//SCR clear
Return
Advanced Gauge Host Firmware Flow Chart Battery Monitor
SLVA114
GGMeasBattVltg(
Battery Voltage From System
Battery Voltage iEND_DSG_VLTG
Call GGUpdate
Return
Advanced Gauge Host Firmware Flow Chart Battery Monitor
SLVA114
GGPwrDwnSave(
iLastRemCap iRemCapNow
Write iLastRemCap
Write iDsgCntrCuml
Write iMaxTemp
iValidDsgRam 0x55
Write iValidDsg= 0x55
Write iDsgCntr
Write iCumlCorrectn
Transfer bq2019 Flash.
Return
Advanced Gauge Host Firmware Flow Chart Battery Monitor
SLVA114
References
Texas Instruments. data sheet bq2019 Advanced Battery Monitor (SLUS456) Texas Instruments. Advanced Gauge Host Firmware Guide Battery Monitor (SLVA100)
Advanced Gauge Host Firmware Flow Chart Battery Monitor
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Doug Williams Power Management Products ABSTRACT advanced battery

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