Manualshelf

Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - battery management Charge indicator Li-Ion SON 12 (2.5x4) Surface-mount
21222324252627282930
Qmax0andQmax1
UpdateStatus0,UpdateStatus1
AvgILastRun
AvgPLastRun
DeltaVoltage
DefaultRaandRaTables
DETAILEDPINDESCRIPTIONS
TheOperationConfigurationRegister
bq27510-G1
SLUS927–APRIL2009.....................................................................................................................................................................................................
www.ti.com
QuitRelaxTimespecifiestheminimumtimerequiredforAverageCurrent()toremainabovetheQuitCurrent
thresholdbeforeexitingrelaxationmode.
GenericallycalledQmax,thesedynamicvariablescontaintherespectivemaximumchemicalcapacityofthe
activecellprofiles,andaredeterminedbycomparingstatesofchargebeforeandafterapplyingtheloadwiththe
amountofchargepassed.Theyalsocorrespondtocapacityatverylowrateofdischarge,suchasC/20rate.For
highaccuracy,thisvalueisperiodicallyupdatedbythebq27510duringoperation.Basedonthebatterycell
capacityinformation,theinitialvalueofchemicalcapacityshouldbeenteredintheQmaxnfieldforeachdefault
cellprofile.TheImpedanceTrack™algorithmupdatesthesevaluesandmaintainsthemintheassociatedactual
cellprofiles.
Bit0(0x01)oftheUpdateStatusnregistersindicatesthatthebq27510haslearnednewQmaxparametersand
isaccurate.Theremainingbitsarereserved.Bits0isastatusflagthatcanbesetbythebq27510althougha
usercanmodifyit.Bit0shouldneverbemodifiedexceptwhencreatingagoldenimagefileasexplainedinthe
applicationnotePreparingOptimizedDefaultFlashConstantsforspecificBatteryTypes(SLUA334.pdf).Bit0is
updatedasneededbythebq27510.
Thebq27510logsthecurrentaveragedfromthebeginningtotheendofeachdischargecycle.Itstoresthis
averagecurrentfromthepreviousdischargecycleinthisregister.Thisregistershouldneverneedtobe
modified.Itisonlyupdatedbythebq27510whenrequired.
Thebq27510logsthepoweraveragedfromthebeginningtotheendofeachdischargecycle.Itstoresthis
averagepowerfromthepreviousdischargecycleinthisregister.Togetacorrectaveragepowerreadingthe
bq27510continuouslymultipliesinstantaneouscurrenttimesVoltage()togetpower.Itthenlogsthisdatato
derivetheaveragepower.Thisregistershouldneverneedtobemodified.Itisonlyupdatedbythebq27510
whenrequired.
Thebq27510storesthemaximumdifferenceofVoltage()duringshortloadspikesandnormalload,sothe
ImpedanceTrack™algorithmcancalculateremainingcapacityforpulsedloads.Itisnotrecommendedto
changethisvalue.
Thesetablescontainencodeddataand,withtheexceptionoftheDefaultRaTables,areautomaticallyupdated
duringdeviceoperation.Nouserchangesshouldbemadeexceptforreading/writingthevaluesfroma
pre-learnedpack(partoftheprocessforcreatinggoldenimagefiles).
Somebq27510pinsareconfiguredviatheOperationConfigurationdataflashregister,asindicatedinTable5
3.Thisregisterisprogrammed/readviathemethodsdescribedinSectionAccessingtheDataFlash.Theregister
islocatedatsubclass=64,offset=0.
Table10.OperationConfigurationBitDefinition
bit7bit6bit5bit4bit3bit2bit1bit0
HighByteRESCAPBATG_OVR–PFC_CFG1PFC_CFG0IWAKERSNS1RSNS0
LowByte–IDSELENSLEEPRMFCCBATL_POLBATG_POLBAT_FNTEMPS
22SubmitDocumentationFeedbackCopyright©2009,TexasInstrumentsIncorporated
ProductFolderLink(s):bq27510-G1
Not Recommended For New Designs