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4.1DATACOMMANDS
4.1.1STANDARDDATACOMMANDS
bq27500
bq27501
System-SideImpedanceTrack™FuelGauge
SLUS785–SEPTEMBER2007
Thebq27500/1usesaseriesof2-bytestandardcommandstoenablesystemreadingandwritingof
batteryinformation.Eachstandardcommandhasanassociatedcommand-codepair,asindicatedin
Table4-1.Becauseeachcommandconsistsoftwobytesofdata,twoconsecutiveI
2
Ctransmissionsmust
beexecutedbothtoinitiatethecommandfunction,andtoreadorwritethecorrespondingtwobytesof
data.Additionaloptionsfortransferringdata,suchasspooling,aredescribedinSection7.1I
2
C
INTERFACE.StandardcommandsareaccessibleinNORMALoperation.Read/Writepermissionsdepend
ontheactiveaccessmode,SEALEDorUNSEALED(fordetailsontheSEALEDandUNSEALEDstates,
seeSection4.4AccessModes).
Table4-1.StandardCommands
COMMANDSEALEDUNSEALED
NAMEUNITS
CODEACCESSACCESS
Control()CNTL0x00/0x01N/AR/WR/W
AtRate()AR0x02/0x03mAR/WR/W
AtRateTimeToEmpty()ARTTE0x04/0x05MinutesRR
Temperature()TEMP0x06/0x070.1°KRR
Voltage()VOLT0x08/0x09mVRR
Flags()FLAGS0x0a/0x0bN/ARR
NominalAvailableCapacity()NAC0x0c/0x0dmAhRR
FullAvailableCapacity()FAC0x0e/0x0fmAhRR
RemainingCapacity()RM0x10/0x11mAhRR
FullChargeCapacity()FCC0x12/0x13mAhRR
AverageCurrent()AI0x14/0x15mARR
TimeToEmpty()TTE0x16/0x17MinutesRR
TimeToFull()TTF0x18/0x19MinutesRR
StandbyCurrent()SI0x1a/0x1bmARR
StandbyTimeToEmpty()STTE0x1c/0x1dMinutesRR
MaxLoadCurrent()MLI0x1e/0x1fmARR
MaxLoadTimeToEmpty()MLTTE0x20/0x21MinutesRR
AvailableEnergy()AE0x22/0x2310mWhrRR
AveragePower()AP0x24/0x2510mWRR
TimeToEmptyAtConstantPower()TTECP0x26/0x27MinutesRR
ReservedRSVD0x28/0x29N/ARR
CycleCount()CC0x2a/0x2bCountsRR
StateOfCharge()SOC0x2c/0x2d%RR
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