Datasheet

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DATAFLASHINTERFACE

AccessingtheDataFlash

bq27510-G1

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.....................................................................................................................................................................................................SLUS927–APRIL2009

BlockDataChecksum():0x60

UNSEALEDAccess:Thisbytecontainsthechecksumonthe32bytesofblockdatareadorwrittentodataflash.

Theleast-significantbyteofthesumofthedatabyteswrittenmustbecomplemented([255–x],forxthe

least-significantbyte)beforebeingwrittento0x60.

SEALEDAccess:Thisbytecontainsthechecksumforthe32bytesofblockdatawrittentoManufacturerInfo

BlockA,B,orC.Theleast-significantbyteofthesumofthedatabyteswrittenmustbecomplemented([255–

x],forxtheleast-significantbyte)beforebeingwrittento0x60.

BlockDataControl():0x61

UNSEALEDAccess:Thiscommandisusedtocontroldataflashaccessmode.Writing0x00tothiscommand

enablesBlockData()toaccessgeneraldataflash.Writinga0x01tothiscommandenablesSEALEDmode

operationofDataFlashBlock().

SEALEDAccess:ThiscommandisnotavailableinSEALEDmode.

DeviceNameLength():0x62

UNSEALEDandSEALEDAccess:ThisbytecontainsthelengthoftheDeviceName.

DeviceName():0x63…0x69

UNSEALEDandSEALEDAccess:ThisblockcontainsthedevicenamethatisprogrammedinDeviceName

ApplicationStatus():0x6a

Thisbytefunctionallowsthesystemtoreadthebq27510ApplicationStatusdataflashlocation.Referto

Table6forspecificbitdefinitions.

Reserved–0x6b–0x7f

Thebq27510dataflashisanon-volatilememorythatcontainsbq27510initialization,default,cellstatus,

calibration,configuration,anduserinformation.Thedataflashcanbeaccessedinseveraldifferentways,

dependingonwhatmodethebq27510isoperatinginandwhatdataisbeingaccessed.

Commonlyaccesseddataflashmemorylocations,frequentlyreadbyasystem,areconvenientlyaccessed

throughspecificinstructions,alreadydescribedinSectionDataCommands.Thesecommandsareavailable

whenthebq27510iseitherinUNSEALEDorSEALEDmodes.

Mostdataflashlocations,however,areonlyaccessibleinUNSEALEDmodebyuseofthebq27510evaluation

softwareorbydataflashblocktransfers.Theselocationsshouldbeoptimizedand/orfixedduringthe

developmentandmanufactureprocesses.Theybecomepartofagoldenimagefileandcanthenbewrittento

multiplebatterypacks.Onceestablished,thevaluesgenerallyremainunchangedduringend-equipment

operation.

Toaccessdataflashlocationsindividually,theblockcontainingthedesireddataflashlocation(s)mustbe

transferredtothecommandregisterlocations,wheretheycanbereadtothesystemorchangeddirectly.Thisis

accomplishedbysendingtheset-upcommandBlockDataControl()(0x61)withdata0x00.Upto32bytesofdata

canbereaddirectlyfromtheBlockData()(0x40…0x5f),externallyaltered,thenrewrittentotheBlockData()

commandspace.Alternatively,specificlocationscanberead,altered,andrewritteniftheircorrespondingoffsets

areusedtoindexintotheBlockData()commandspace.Finally,thedataresidinginthecommandspaceis

transferredtodataflash,oncethecorrectchecksumforthewholeblockiswrittentoBlockDataChecksum()

(0x60).

ProductFolderLink(s):bq27510-G1

Not Recommended For New Designs