Datasheet

bq27510-G1
SLUS927–APRIL2009..................................................................................................................................................................................................... www.ti.com
DSG=Dischargingdetected.Truewhenset.
NominalAvailableCapacity():0x0c/0x0d
Thisread-onlycommandpairreturnstheuncompensated(lessthanC/20load)batterycapacityremaining.Units
aremAh.
FullAvailableCapacity():0x0e/0x0f
Thisread-onlycommandpairreturnstheuncompensated(lessthanC/20load)capacityofthebatterywhenfully
charged.UnitsaremAh.FullAvailableCapacity()isupdatedatregularintervals,asspecifiedbytheITalgorithm.
RemainingCapacity():0x10/0x11
Thisread-onlycommandpairreturnsthecompensatedbatterycapacityremaining.UnitsaremAh.
FullChargeCapacity():0x12/13
Thisread-onlycommandpairreturnsthecompensatedcapacityofthebatterywhenfullycharged.Unitsare
mAh.FullChargeCapacity()isupdatedatregularintervals,asspecifiedbytheITalgorithm.
AverageCurrent():0x14/0x15
Thisread-onlycommandpairreturnsasignedintegervaluethatistheaveragecurrentflowthroughthesense
resistor.Itisupdatedevery1second.UnitsaremA.
TimeToEmpty():0x16/0x17
Thisread-onlyfunctionreturnsanunsignedintegervalueofthepredictedremainingbatterylifeatthepresent
rateofdischarge,inminutes.Avalueof65,535indicatesbatteryisnotbeingdischarged.
TimeToFull():0x18/0x19
Thisread-onlyfunctionreturnsanunsignedintegervalueofpredictedremainingtimeuntilthebatteryreaches
fullcharge,inminutes,baseduponAverageCurrent().Thecomputationaccountsforthetapercurrenttime
extensionfromthelinearTTFcomputationbasedonafixedAverageCurrent()rateofchargeaccumulation.A
valueof65,535indicatesthebatteryisnotbeingcharged.
StandbyCurrent():0x1a/0x1b
Thisread-onlyfunctionreturnsasignedintegervalueofthemeasuredstandbycurrentthroughthesense
resistor.TheStandbyCurrent()isanadaptivemeasurement.Initiallyitreportsthestandbycurrentprogrammed
inInitialStandby,andafterspendingsometimeinstandby,reportsthemeasuredstandbycurrent.
Theregistervalueisupdatedevery1secondwhenthemeasuredcurrentisabovetheDeadbandcurrentandis
lessthanorequalto2xInitialStandby.Thefirstandlastvaluesthatmeetthiscriteriaarenotaveragedin,
sincetheymaynotbestablevalues.Toapproximatea1-minutetimeconstant,eachnewStandbyCurrent()
valueiscomputedbytakingapproximate93%weightofthelaststandbycurrentandapproximate7%ofthe
currentmeasuredaveragecurrent.
StandbyTimeToEmpty():0x1c/0x1d
Thisread-onlyfunctionreturnsanunsignedintegervalueofthepredictedremainingbatterylifeatthestandby
rateofdischarge,inminutes.ThecomputationusesNominalAvailableCapacity(NAC),theuncompensated
remainingcapacity,forthiscomputation.Avalueof65,535indicatesbatteryisnotbeingdischarged.
MaxLoadCurrent():0x1e/0x1f
Thisread-onlyfunctionreturnsasignedintegervalue,inunitsofmA,ofthemaximumloadconditions.The
MaxLoadCurrent()isanadaptivemeasurementwhichisinitiallyreportedasthemaximumloadcurrent
programmedinInitialMaxLoadCurrent.IfthemeasuredcurrentisevergreaterthanInitialMaxLoadCurrent,
thenMaxLoadCurrent()updatestothenewcurrent.MaxLoadCurrent()isreducedtotheaverageofthe
previousvalueandInitialMaxLoadCurrentwheneverthebatteryischargedtofullafterapreviousdischarge
toanSOClessthan50%.Thispreventsthereportedvaluefrommaintaininganunusuallyhighvalue.
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