bq76925中文资料

bq76925–JULY2011–REVISEDJULY2011用于3至6系列锂离子电池的主机控制模拟前端/高分子聚合物电池保护和电量测量机应用查询样品:bq769251特性说明•用于主机电流测量的模拟接口bq76925主机控制器模拟前端(AFE)是完整组监视的一部分,用于3,4,5或6系列锂电池的平衡和保护。–电池输入MUX,电平位移器和计数器bq76925接受主机控制器以轻松监视单个电池电压、–1.5/3.0V低漂移，校准基准允许到数字转换的精准模拟组电压和温度。这些信息可被主机用来确定非安全或•用于主机电流测量的模拟接口者错误运行环境，例如过压、欠压、过热和电流过载，–可与1mΩ传感电阻一同工作的可变增益电流传以及电池不平衡，充电状态和健康状态。感放大器电池输入电压经电平位移，复用和计数后输出到主•用于主机温度测量的可开关电热调节器偏压输出机ADC进行测量。有一个专用引脚提供的低漂移校准•含动态可调阀值的过载比较器基准电压使精准测量开启。–提醒主机可能的过载错误经过外部传感电阻器的电压被放大并且输出到主–可用于唤醒带载主机机ADC用于充放电电流的测量。两个增益装置开启在•集成电池平衡FET一个广泛范围的组电流下具有多种传感器电阻值的操–单个主机控制作。–50mA没电池平衡电流•支持电池感应线裸线检测为了使主机能进行温度测量,AFE提供一个分开的引脚•集成3.3V调机器用于位微处理器和/或者LED供用于偏置外部电热调节器网络。此输出的开关由主机电控制以将能耗降到最低。•I2C接口用于主机通信bq76925包括一个含动态可选阀值的比较器以用来监–用于稳健运行的可选数据包CRC视电流值。比较器结果由一个漏极开路输出驱动，当•电源电压范围4.2至26.4V超过阀值时，此结果向主机报警。此特性可用来唤醒•低功耗带载主机，或者警告主机可能的故障条件。–正常模式下典型值40µA–睡眠模式时最大值1.5µAbq76925集成了由主机完全控制的电池平衡FET。最•20-引脚TSSOP或者24-引脚QFN封装高50mA的平衡电流可由外部电阻器设定。这些相同的FET能与电池电压测量计一起使用以检测电池感应线应用范围上的裸线。•锂离子电池组的一级保护主机通过一个I2C接口与AFE通信。数据包CRC可选择–无线电源工具用于保证稳健运行。此设备可由I2C接口使其进入低电–轻型电动交通工具(电动自行车,小型摩托车等)流睡眠模式并由通过上拉ALERT引脚将其唤醒。–UPS系统–医疗设备–便携式测试设备1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.UNLESSOTHERWISENOTEDthisdocumentcontainsCopyright©2011,TexasInstrumentsIncorporatedPRODUCTIONDATAinformationcurrentasofpublicationdate.ProductsconformtospecificationsperthetermsofTexasEnglishDataSheet:SLUSAM9Instrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.12345678910bq7692520191817161514131211VCTLBATVC6VC5VC4VC3VC2VC1VC0VSSSENSEPALERTVIOUTVCOUTVTBVREFSDASCLV3P3SENSEN24232221207891011181716151412345bq769251913126VCTLBATVC6VC5VC4VC3VC2VC1SENSENVSSSENSEPALERTVIOUTVCOUTVTBVREFSDASCLV3P3VC0NCNCNCNCPACKAGEPREVIEWPWPACKAGE(TOPVIEW)RGEPACKAGE(TOPVIEW)bq76925ZHCS327A–JULY2011–REVISEDJULY2011(1)224BATPowerSupplyvoltage,tiedtomostpositivecell31VC6InputSensevoltageformostpositivecell42VC5InputSensevoltageforsecondmostpositivecell53VC4InputSensevoltageforthirdmostpositivecell64VC3InputSensevoltageforfourthmostpositivecell75VC2InputSensevoltageforfifthmostpositivecell86VC1InputSensevoltageforleastpositivecell97VC0InputSensevoltagefornegativeendofcellstack108VSSPowerGround9NCNANoConnection(leaveopen)10NCNANoConnection(leaveopen)1111SENSENInputNegativecurrentsense1212SENSEPInputPositivecurrentsense1313ALERTOutputOvercurrentalert(opendrain)1414VIOUTOutputCurrentmeasurementvoltage1515VCOUTOutputCellmeasurementvoltage1616VTBOutputBiasvoltageforthermistornetwork1717VREFOutputReferencevoltageforADC1818SDAInput/OutputI2CData(opendrain)1919SCLInputI2CClock(opendrain)2020V3P3Output3.3VRegulator21NCNANoConnection(leaveopen)22NCNANoConnection(leaveopen)(1)WhenabypassFETisusedtosupplytheregulated3.3Vloadcurrent,VCTLautomaticallyadjuststokeepV3P3=3.3V.IfVCTListiedtoBAT,theloadcurrentissuppliedthroughV3P3.2Copyright©2011,TexasInstrumentsIncorporatedbq76925+-+-+-+-+-+-CellMUXLevelShiftBalanceControlRINCINRINRINRINRINRINRINCINCINCINCIN+-Amp-+AmpITHRESH+-CompVREGPORI2CEEREGSCellSelectBalSelectThreshSelectBATVC6VC5VC4VC3VC2VC1VC0SENSENSENSEPVCTLV3P3SCLSDAVREFVTBVCOUTVIOUTALERTPACK+PACK-RSENSE3.3VuC/LEDSupplyADCReferenceADCCh1TempADCCh2CellVoltageADCCh3PackCurrentOvercurrentAlertCREFCTHCOUTCOUTRNTCRTHI2CInterfaceBypassFET(optional)VSSREF×0.51.5/3.0VREFVCOUTSelectRefSelectNTCBiasSwitchGain=0.3,0.6Gain=4,825,50,75,100,…,400mVCV3P3-+AmpGain=1GainSelectREF×0.85WakeupDetectPolaritySelectShuntSelectRVCTLRSENSENRSENSEPCSENSEOutputRange=1V,2VCINCINHold-upcircuit(optional)RBATDBATZBATCBATbq76925–JULY2011–REVISEDJULY2011FUNCTIONALBLOCKDIAGRAMORDERINGINFORMATION(1)TAPACKAGEPARTNUMBER(2)20-PinPWbq76925PW–25°Cto85°C24-PinRGEbq76925RGE(3)(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteat(2)ThePWandRGEpackageoptionsarealsoavailabletapedandreeled.AddanRsuffixtothedevicetype(e.g.,bq76925PWRfor2000unitsperreel).Seeapplicationssectionofdatasheetforlayoutinformation.(3)ProductPreviewCopyright©2011,TexasInstrumentsIncorporated3bq76925ZHCS327A–JULY2011–REVISEDJULY2011(1)overoperatingfree-airtemperaturerange(unlessotherwisenoted)RANGE(2)MINMAXUNITSSupplyVBATvoltageBAT–0.336VrangeCellinputdifferential,VCntoVCn+1,n=0to5–0.39Cellinput,VCn,n=1to6–0.3(6×n)InputBATtoVC6differential–1010VIvoltageVVC0(3)–33rangeSENSEP,SENSEN–33SCL,SDA–0.36VCOUT,VIOUT,VREF–0.33.6OutputVTB,V3P3–0.37VOvoltageVALERT–0.330rangeVCTL–0.336ICBCellbalancingcurrent70mAIINCellinputcurrent–2570mATSTGStoragetemperaturerange–65150°C(1)Stressesbeyondthoselistedunder“absolutemaximumratings”maycausep