設(shè)計參考、源碼手冊1746個zhcs384d

bq24160,bq24160Abq24161,bq24161Bbq24163,ZHCS384D–NOVEMBER2011–REVISEDNOVEMBER帶有電源路徑管理和I2C接口的2.5A，雙輸入，單節(jié)開關(guān)模式鋰離子電池查詢樣品bq24160bq24160Abq24161bq24161Bbq24163特 采用2.8mm×2.8mm49-焊球WCSP或者 ×4mmQFN-24小型封 應(yīng)用范 便攜

USB輸入電壓 說IN輸入電壓 IN6.5V2.5AIN(輸入電流限制1.5AUSB(輸入電流限制

且含有高容量電池的便攜式應(yīng)用。為了實現(xiàn)多用途解能夠在USB端口或者更高功率輸入電源（即交流(AC適配器或者無線充電輸入）可使用I2C設(shè)定的充電參數(shù)?接口設(shè)定充電參 應(yīng)用電路原理制，VINDPM閥值，安全裝置和安全定時器（針bq24160Abq24168被禁用)

Wireless

低電池電流，BAT短路保

TEMP+Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddierstheretoappearsattheendofthisdatasheet.?2011–2012,TexasInstrumentsI2Cisa?2011–2012,TexasInstrumentsPRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoes EnglishDataSheet:necessarilyincludetestingofallThesedeviceshavelimitedbuilt-inESDprotection.TheleadsshouldbeshortedtogetherorthedevicecedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.說明（繼續(xù)此電源路徑管理特性允許bq2416x使用高效DC-到-DC轉(zhuǎn)換器為系統(tǒng)供電，與此同時對電池獨立充電。此充電器于3.5V。此最小系統(tǒng)電壓支持使此系統(tǒng)能夠與損壞電池組一起運行或者在無電池組時運行，并且在完全放電電池流需要。這樣可使用較小的適配器。2.5A輸入電流能力可實現(xiàn)在不考慮電池電壓的情況下，一旦適配器插入就可進(jìn)行GSM 呼叫?？墒褂肐2C接口對充電參數(shù)進(jìn)行編程設(shè)定。IC結(jié)溫，當(dāng)其超過內(nèi)部溫度閾值時，它會減少充電電流。此外，還包括一個基于電壓的電池組熱敏電阻器輸入(TS)來電池溫度以實現(xiàn)安全充電。針對bq24160，bq24160A，bq24161B，bq24163和bq24168的TS功能與JEITA標(biāo)準(zhǔn)兼容。ORDERINGPARTNUMBER(1)USBINUSBTheYFFandRGEpackagesareavaialbleinthefollowingoptions:R-tabedandreeledin tiesof3,000devicesperreel.T-tapedandreeled tiesof250devicesperThisproductisRoHScompatble,includingaleadconcentrationthatdoesnotexceed0.1%oftotalproductweight,andissuitableforuseinspecifiedlead-solderingprocesses.Inaddition,thisproductusespackagematerialsthatdonotcontainhalogens,includingbromine(Br)orantimony(Sb)above0.1%oftotalproductweight. UMoveroperating-airtemperaturerange(unlessotherwiserespecttoVSS)IN,VPMIDI,PMIDU,VVSDA,SCL,SYS,BAT,STAT,BGATE,DRV,TS,D+,D–,INT,PSEL,7VBOOTto7VOutputcurrentASYS,AInputcurrentAAOutputsink1Operating-airtemperatureJunctiontemperature,Storagetemperature,Leadtemperature(soldering,10Stressesbeyondthoselistedunderabsolute umratingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder mendedoperatingconditionsisnotimplied.Exposuretoabsolute- um-ratedconditionsforextendedperiodsmayaffectdevicereliability.Allvoltagevaluesarewithrespecttothenetworkgroundterminalunlessotherwisenoted.THERMALTHERMAL49PINS24PINSJunction-to-ambientthermalJunction-to-case(top)thermalJunction-to-boardthermalJunction-to-topcharacterizationJunction-to-boardcharacterizationJunction-to-case(bottom)thermalFormoreinformationabouttraditionalandnewthermalmetrics,seetheICPackageThermalMetricsapplicationreport,MENDEDOPERATINGoveroperating-airtemperaturerange(unlessotherwiseINvoltageVINoperatingvoltagerangeINoperatingvoltagerange USBvoltageVUSBoperating Inputcurrent,INAInputcurrentUSBAOuputCurrentfromSW,3AADischarging,usinginternalbatteryAOperatingjunctiontemperature0ELECTRICALCircuitof,VSUPPLY=VUSBorVN(whicheverissupplyingtheIC),VUVLO<VSUPPLY<VOVPandVSUPPLY>VBAT+VSLP,TJ=–40°C–125°CandTJ=25oCfortypicalvalues(unlessotherwisenoted)TESTINPUTSupplycurrentforcontrol(VorV<V<VandV>V+VswitchingNOTswitching50°C<T<85°C,High-ZLeakagecurrentfromBATtothe0°C<T<85°C,V=4.2V,V=V=5BatterydischargecurrentinHighImpedancemode,(BAT,SW,SYS)0°C<T<85°C,V=42V,V=5Vor0V,SCL,SDA=0Vor1.8V,High-ZModePOWER-PATHSystemregulationChargeEnabled,V<bq24160,1,3 V 3BatteryFETturnedoff(ChargeDisabled,TSFaultorChargingTerminated)VBATREGVBATREG+1 + +MinimumsystemregulationChargeenabled,V<V,InputcurrentlimitorVactivebq24160,1, V 3VEntersupplementmodeV>2VExitsupplementmodeV>2VCurrentlimit,dischargeorsupplementCurrentmonitoredininternalFET7ADeglitchtime,SYSshortcircuitduringdischargeorsupplementmodeMeasuredfrom(V–V)=300mVtoBAThigh-Recoverytime,SYSshortcircuitduringdischargeorsupplementmodeBatteryrangeforBGATEandsupplementmode 4VBATTERYInternalbatterychargerMOSFETMeasuredfromBATtoSYS,V=42VYFF RGE ChargeOperatinginvoltageregulation,ble VVoltageregulation FastchargecurrentV≤V<Vble Fastchargecurrent0°Cto Batteryshortcircuit100mVbq24161,3, Vbq24160, BatteryshortcircuitV<DeglitchtimeforbatteryshortcircuittofastchargeTerminationchargecurrentI= I≥ DeglitchtimeforchargeBothrisingandfalling,2mVoverdrive,tt=RechargethresholdBelowDeglitchVBATfallingbelowVRCH,BatterydetectionDuringbatterydetectionsourceVDuringbatterydetectionsinkBatterydetectioncurrentbeforechargedone(sinkTerminationenabled(EN_TERM=BatterydetectionTerminationenabled(EN_TERM=PSEL,CDInputhighlogicVPSEL,CDInputlowlogicVELECTRICALCHARACTERISTICSELECTRICALCHARACTERISTICS)CircuitofFigure23,VSUPPLY=VUSBorVN(whicheverissupplyingtheIC),VUVLO<VSUPPLY<VOVPandVSUPPLY>VBAT+VSLP,TJ=-40°C–125°CandTJ=25oCfortypicalvalues(unlessotherwisenoted)TESTINPUTCURRENTInputcurrentlimitthreshold(USBUSBchargemode,V=5V,DCCurrentpulledfromSWI=I=IUSBLM=I=I=I=Inputcurrentlimitthreshold(ININchargemode,V=5V,DCCurrentpulledfromSWIinlim=1AIinlim=2InputbasedDPMthresholdChargemode,bleviaI2C,bothVVthresholdVDRVBIASInternalbiasregulatorV>5VDRVoutputDRVDropoutvoltage(V–I=1A,V=5V,I=STATUSOUTPUT(STAT,Low-leveloutputsaturationI=10mA,sinkVHigh-levelleakageV=V=1ICactivethresholdV4VICactiveVfallingfromaboveSleep-modeentrythreshold,V-2.0V≤V≤V,V0Sleep-modeexit2.0V≤VDeglitchtimeforsupplyrisingaboveRisingvoltage,2mVoverdrive,t=Badsourcedetection–80VDeglitchonbadsourceInputsupplyOVPthresholdUSB,VVIN,VRisingIN,VRisingVSupplyfallingfromBatteryOVPthresholdVthresholdoverVtoturnoffchargerduring1.0251051075VVLowerlimitforVfallingfromabove1%BatteryOVPBOVPfaultshowninregisteroncetBuckconvertershutdownimmediaywhenV>1BatteryundervoltagelockoutVrising,100mVVCycle-by-cyclecurrentV5AThermalThermalThermalregulationChargecurrentbeginstocutSafetytimer(bq24160/1/3InternaltopreverseblockingMOSFETI=500mA,MeasuredfromUSBtoI=500mA,MeasuredfromINtoMeasuredfromPMDUtoMeasuredfromPMDItoInternalbottomN-channelMOSFETMeasuredfromSWtoOscillator1umdutyMinimumdutyCircuitof,VSUPPLY=VUSBorVN(whicheverissupplyingtheIC),VUVLO<VSUPPLY<VOVPandVSUPPLY>VBAT+VSLP,TJ=-40°C–125°CandTJ=25oCfortypicalvalues(unlessotherwisenoted)TESTBATTERY-PACKNTCHightemperatureV30HysteresisonhighV1HightemperatureV39HysteresisonhighV1LowtemperatureV56HysteresisonlowV1LowtemperatureVHysteresisonlowV1TSDisableVrising,2%VDeglitchtimeonTSD+/D–DETECTIOND+VoltageVD+ConnectionCheckCurrent7D-CurrentLeakageCurrentintoD–,switch1D+,switch1D+LowComparatorVD-LowComparatorRD-PulldownforConnection1424BATGDGoodBattery3VDeglitchforgoodbatteryVrisingtoHIGH-Zmode,DEFAULTModeI2CCOMPATIBLEInputlowthresholdV=18V,SDAandVInputlowthresholdV=18V,SDAandVOutputlowthresholdI=10mA,sinkVHigh-LevelleakageV=18V,SDAand1Watchdogtimer(bq24160/1/3sBLOCK 5.2-V

USB

++

USB

DC-DC

VUSBOVPVINVUSBVBAT+SleepVBAT+

SUPPLYStartEnableGood2I

RechargeVSYSREGVBATSC

Hi-Z

bq24160,1B,

VBOVP

TSTS

VBATREG–TS

withTimersPIN

441211109121110987

NC

1211109121110987Figure1.24-PinQFN(Top

(Top Figure2.49-Ball2.8mmx2.8mmWCSPPINPINNO.PINNO.G1-11,G1-11,BatteryConnection–Connecttothepositiveterminalofthebattery.Additionally,bypassBATtoGNDwithatleasta1μFcapacitor.OExternalDischargeMOSFETGateConnection–BGATEdrivesanexternalP-ChannelMOSFETtoprovideaverylow-dischargepath.ConnectBGATEtothegateoftheexternalMOSFET.BGATEislowduringhighimpedancemodeandwhennoinputisconnected.IHighSideMOSFETGateDriverSupply–Connecta0.01μFceramiccapacitor(voltage>10V)fromBOOTtoSWtosupplythegatedriveforthehighsideIICHardwareDisableInput–DriveCDhightocethebq2416xinhigh-zmode.DriveCDlowfornormaloperation.DonotleaveCDunconnected.2——ID+andD–ConnectionsforUSBInputAdapterDetection–WhenachargecycleisinitiatedbytheUSBinput,andashortisdetectedbetweenD+andD–,heUSBinputcurrentlimitissetto1.5A.Ifashortisnotdetected,theUSB100modeisselected.TheD+/D–detectionhasnoeffectontheINinput.1——I66OGateDriveSupply–DRVisthebiassupplyforthegatedriveoftheinternalMOSFETs.BypassDRVtoPGNDwitha1μFceramiccapacitor.DRVmaybeusedtodriveexternalloadsupto10mA.DRVisactivewhenevertheinputisconnectedandVSUPPLY>VUVLOandVSUPPLY>(VBAT+A1-A1-IInputpowersupply–INisconnectedtotheexternalDCsupply(ACadapteroralternatepowersource).BypassINtoPGNDwithatleasta1μFceramiccapacitor.77OStatusOutput–INTisanopen-drainoutputhatsignalschargingstatusandfaultinterrupts.INTpullslowduringcharging.INTishighimpedancewhenchargingiscompleteorthechargerisdisabled.Whenafaultoccurs,a128μspulseissentoutasaninterruptforthehost.INTisenabled/disabledusingtheEN_STATbitinthecontrolregister.ConnectINTtoalogicrailhrougha100kΩresistortocommunicatewiththehostprocessor.E1,5,16,E1,5,16,—Groundterminal–Connecttothethermalpad(forQFNonly)andthegroundneoftheB1-B1-OReverseBlockingMOSFETandHighSideMOSFETConnectionPointforHighPowerInput–BypassPMIDItoGNDwithatleasta4.7μFceramiccapacitor.UsecautionwhenconnectinganexternalloadtoPMIDI.ThePMIDIoutputisnotcurrentlimited.AnyshortonPMIDIwilldamagetheIC.B5-B5-OReverseBlockingMOSFETandHighSideMOSFETConnectionPointforUSBInput–BypassPMIDUtoGNDwithatleasta4.7μFceramiccapacitor.UsecautionwhenconnectinganexternalloadtoPMIDU.ThePMIDUoutputisnotcurrentlimited.AnyshortonPMIDUwilldamagetheIC.——2USBSourceDetectionInput–DrivePSELhightoindicatethataUSBsourceisconnectedtoheUSBinput.WhenPSELishigh,theICstartsupwitha100mA(bq24161/8)or500mA(bq24161B)inputcurrentlimitforUSB.DrivePSELlowtoindicatethatanACAdapterisconnectedtotheUSBinput.WhenPSELislow,theICstartsupwitha1.5AinputcurrentlimitforUSB.PSELhasnoeffectontheINinput.DonotleavePSELunconnected.33II2CInterfaceClock–ConnectSCLtohelogicrailthrougha10kΩ44I2CInterfaceData–ConnectSDAtothelogicrailthrougha10kΩ88OStatusOutput–STATisanopen-drainoutputthatsignalschargingstatusandfaultinterrupts.STATpullslowduringcharging.STATishighimpedancewhenchargingiscompleteorthechargerisdisabled.Whenafaultoccurs,a128μspulseissentoutasaninterruptforthehost.STATisenabled/disabledusingtheEN_STATbitinthecontrolregister.PullSTATuptoalogicrailthruoghanLEDforvisualindicationorthrougha10kΩresistortocommunicatewiththehostC1-C1-OInductorConnection–ConnecttotheswitchedsideoftheexternalF1-13,F1-ISystemVoltageSenseandChargerFETConnection–ConnectSYStothesystemoutputattheoutputbulkcapacitors.BypassSYSlocallywithatleast10μF.A47μFbypasscapacitorismendedforoptimaltransient99IBatteryPackNTCMonitor–ConnectTStothecentertapofaresistordividerfromDRVtoGND.TheNTCisconnectedfromTStoGND.TheTSfunctionprovides4thresholdsforJEITAcompaibility(160,161B,163,168only).TSfaultsarereportedbytheI2Cinterface.SeetheNTCMonitorsectionformoredetailsonoperationandselectingtheresistorvalues.ConnectTStoDRVtodisableheTSfunction.A5-A5-IUSBInputPowerSupply–USBisconnectedtotheexternalDCsupply(ACadapterorUSBport).BypassUSBtoPGNDwithatleasta1μFceramiccapacitor.———ThereisaninternalelectricalconnectionbetweentheexposedthermalpadandthePGNDpinofthedevice.ThethermalpadmustbeconnectedtothesamepotentialashePGNDpinontheprintedcircuitboard.Donotusethethermalpadastheprimarygroundinputforthedevice.PGNDpinmustbeconnectedtogroundatallTYPICALAPPLICATION1.50.011 4.7101 4.711 Figure3.bq24160,ShownwithnoExternalDischargeFET,PAConnectedto1.50.011114.7101F4.7 11USBFigure4.–bq24161,ShownwithExternalDischargeFET,PAConnectedtoSystemforGSMCallSupportwithaDeeplyDischargedorNoBatteryTYPICALUSBPlug-InwithBattery INPlug-inwithBattery Conditions:USB500,925mACharge Conditions:1500mAILIM,1300mAChargeFigure FigureAdapterDetection BatteryInsertDuringBattery Conditions:TerminationFigure FigureBatteryPullDuring LoadTransientinto Conditions:TerminationEnabled Conditions:MINSYSOperation,USB1500,200mA-1400mALoadSteponSYSFigure FigureTYPICALCHARACTERISTICS(

OVPLoadTransientintoSupplement USB10Conditions:MINSYSOperation,USB500,200mA-1400mALoadSteponSYS

4Figure FigureIN USB EfficiencyEfficiencyEfficiencyEfficiency SystemCurrent

SystemCurrent

Conditions:ChargeDisabled,SYSloaded,VBATREG=3.6V,IN2500 Conditions:ChargeDisabled,SYSloaded,VBATREG=3.6V,USB1500 Figure FigureSYSREGandMINSYSRegulationvs. BatteryRegulationvsSYSREGandSYSREGandMINSYSRegulationSYSREGRegulationMINSYSRegulation33

4BatteryBatteryRegulation

Temperature TemperatureConditions:VBAT= Conditions:VBATREG=4.2V,Noload,TerminationFigure FigureTYPICALCHARACTERISTICS(USBInputCurrentLimitvs. 6.5VOVPThresholdvs. USBInputUSBInputCurrentLimit6.5V6.5VOVPThreshold 0

6 Temperature

Temperature

Conditions:USB100andUSB500currentlimit,VUSB=5V,VBAT= Conditions:USBinputandINinput(bq24168)Figure Figure10.510.5VOVPThreshold

10.5VOVPThresholdvs. ChargeCurrentvs.Battery22ChargeCurrentChargeCurrent2222222 4Temperature BatteryVoltageConditions:ICHARGE=2A,VIN=5V,VBATREG=

Figure FigureIBATSHRTvs.BatteryIBATSHRTIBATSHRT

BatteryVoltageFigure

DETAILEDThebq24160/bq24160A/bq24161/bq24161B/bq24163/bq24168arehighlyintegratedsinglecellLi-Ionbatterychargersandsystempowerpathmanagementdevicestargetedforspace-limited,portableapplicationswithhighcapacitybatteries.Thedual-input,single-cellchargeroperatesfromeitheraUSBportoralternatepowersource(i.e.walladapterorwirelesspowerinput)foraversatilesolution.Thepowerpathmanagementfeatureallowsthebq2416xtopowerthesystemfromahighefficiencyDC-to-DCconverterwhilesimultaneouslyandindependentlychargingthebattery.Thechargermonitorsthebatterycurrentatalltimesandreducesthechargecurrentwhenthesystemloadrequirescurrentabovetheinputcurrentlimit.Thisallowsproperchargeterminationandenablesthesystemtorunwithadefectiveorabsentbatterypack.Additionally,thisenablesinstantsystemturn-onevenwithatotallydischargedbatteryornobattery.Thepower-pathmanagementarchitecturealsopermitsthebatterytosupplementthesystemcurrentrequirementswhentheadaptercannotdeliverthepeaksystemcurrents.Thisenablestheuseofasmalleradapter.The2.5AcurrentcapabilityallowsforGSMphonecallsassoonastheadapterispluggedinregardlessofthebatteryvoltage.ThechargeparametersareprogrbleusingtheI2Cinterface.CHARGEMODEChargeTheinternalbatteryMOSFETisusedtochargethebattery.WhenthebatteryisabovetheMINSYSvotlage,thetheinternalFETisonto izeefficiencyandthe converterregulatesthechargecurrentintothebattery.WhenbatteryislessthanMINSYS,theSYSisregulatedtoVSYS(REG)andbatteryischargedusingthebatteryFETtoregulatethechargecurrent.Thereare5loopsthatinfluencethechargecurrent:ConstantcurrentloopConstantvoltageloopMinimumsystem-voltageloopInput-voltagedynamicpower-managementloop(VIN-Duringthechargingprocess,allfiveloopsareenabledandtheonethatisdominanttakescontrol.Thebq2416xsupportsaprecisionLi-IonorLi-Polymerchargingsystemforsingle-cellapplications.TheDynamicPowerPathManagement(DPPM)featureregulatesthesystemvoltagetoaminimumofVMINSYS,sothatstartupisenabledevenforamissingordeeplydischargedbattery.Figure22showsatypicalchargeprofileincludingtheminimumsystemoutputvoltagefeature.ChargeCurrent50mAPrechargetoClosePack

LinearChargetoMaintain

BatteryFETisFigure22.Typicalbq2416xChargingControllerinChargeThebq2416xprovidesanintegrated,fixed-frequency1.5MHzvoltage-modecontrollertopowerthesystemandsupplythechargecurrent.Thevoltageloopisinternallycompensatedandprovidesenoughphasemarginforstableoperation,allowingtheuseofsmallceramiccapacitorswithverylowESR.Theinputschemeforthebq2416xpreventsbatterydischargewhenthesupplyvoltagesarelowerthanVBATandalsoisolatesthetwoinputsfromeachother.Thehigh-sideN-MOSFET(Q1/Q2)switchestocontrolthepowerdeliveredtotheoutput.TheDRVLDOprovidesasupplyforthegatedriveforthelowsideMOSFET,whileabootstrapcircuit(BST)withanexternalbootstrapcapacitorisusedtoboostupthegatedrivevoltageforQ1andBothinputsareprotectedbyacycle-by-cyclecurrentlimitthatissensedthroughthehigh-sideMOSFETsforQ1andQ2.Thethresholdforthecurrentlimitissettoanominal5Apeakcurrent.Theinputsalsoutilizeaninputcurrentlimitthatlimitsthecurrentfromthepowersource.BatteryChargingWhenthebatteryisdeeplydischargedorshorted(VBAT<VBATSHRT),thebq2416xappliesIBATSHRTtoclosethepackprotectorswitchandbringthebatteryvoltageuptoacceptablecharginglevels.Duringthistime,thebatteryFETislinearlyregulatedandthesystemoutputisregulatedtoVSYS(REG).OncethebatteryrisesaboveVBATSHRT,thechargecurrentisregulatedtothevaluesetintheI2Cregister.ThebatteryFETislinearlyregulatedtomaintainthesystemvoltageatVSYS(REG).Undernormalconditions,thetimespentinthisregionisaveryshortpercentageofthetotalchargingtime,sothelinearregulationofthechargecurrentdoesnotaffecttheoverallchargingefficiencyforverylong.Ifthedietemperaturedoesrise,thethermalregulationcircuitreducesthechargecurrenttomaintainadietemperaturelessthan120°C.IfthecurrentlimitfortheSYSoutputisreached(limitedbytheinputcurrentlimit,orVIN_DPM),theSYSoutputdropstotheVMINSYSoutputvoltage.Whenthishappens,thechargecurrentisreducedtoprovidethesystemwithallthecurrentthatisneededwhilemaintainingtheminimumsystemvoltage.Ifthechargecurrentisreducedto0mA,pullingfurthercurrentfromSYScausestheoutputtofalltothebatteryvoltageandentersupplementmode.(SeetheDynamicPowerPathManagementsectionformoredetails.)OncethebatteryischargedenoughsothatthesystemvoltagebeginstoriseaboveVSYS(REG),thebatteryFETisturnedonfullyandthebatteryischargedwiththefullprogrammedchargecurrentsetbytheI2Cinterface,ICHARGE.Theslewrateforthefast-chargecurrentiscontrolledtominimizecurrentandvoltageovershootduringtransients.ThechargecurrentisregulatedtoICHARGEuntilthebatteryischargedtotheregulationvoltage.Oncethebatteryvoltageisclosetotheregulationvoltage,VBATREG,thechargecurrentistapereddownasshowninFigure22whiletheSYSoutputremainsconnectedtothebattery.Thevoltage-regulationfeedbackoccursbymonitoringthebattery-packvoltagebetweentheBATandPGNDpins.Thebq2416xisafixedsingle-cellvoltageversion,withadjustableregulationvoltage(3.5Vto4.44V),programmedusingtheI2Cinterface.Thebq2416xmonitorsthechargingcurrentduringthevoltage-regulationphase.Oncetheterminationthreshold,ITERM,isdetectedandthebatteryvoltageisabovetherechargethreshold,thebq2416xterminatescharge,turnsoffthebatterychargingFETandentersbatterydetection.ThesystemoutputisregulatedtotheVSYS(REG)andsupportsthefullcurrentavailablefromtheinputandthebatterysupplementmodeisavailable.(SeetheDynamicPowerPathManagementsectionformoredetails.)Theterminationcurrentlevelisprogrble.Todisablethechargecurrenttermination,thehostsetsthechargeterminationbit(TE)ofchargecontrolregisterto0,refertoI2Csectionfordetails.AnewchargecycleisinitiatedwhenoneofthefollowingconditionsisThebatteryvoltagefallsbelowtheVBATREG-VRCHVSUPPLYCEbittoggleorRESETbitisHI-ZbitBatteryWhenterminationconditionsaremet,abatterydetectioncycleisstarted.Duringbatterydetection,IDETECTispulledfromVBATfortDETECTtoverifythereisabattery.IfthebatteryvoltageremainsaboveVDETECTforthefulldurationoftDETECT,abatteryisdeterminedtopresentandtheICenters“ChargeDone”.IfVBATfallsbelowVDETECT,a“BatteryNotPresent”faultissignaledandbatterydetectioncontinues.Thenextcycleofbatterydetection,thebq2416xturnsonIBATSHORTfortDETECT.IfVBATrisestoVDETECT,thecurrentsourceisturnedoffandaftertDETECT,thebatterydetectioncontinuesthroughanothercurrentsinkcycle.Batterydetectioncontinuesuntilchargeisdisabledorabatteryisdetected.Onceabatteryisdetected,thefaultstatusclearsandanewchargecyclebegins.Batterydetectionisnotrunwhenterminationisdisabled.DynamicPowerPathManagementThebq2416xfeaturesaSYSoutputthatpowerstheexternalsystemloadconnectedtothebattery.ThisoutputisactivewheneverasourceisconnectedtoIN,USBorBAT.ThefollowingsectionsdiscussthebehaviorofSYSwithasourceconnectedtothesupplyorabatterysourceonly.InputSourceWhenavalidinputsourceisconnected,thebuckconverterturnsontopowertheloadonSYS.TheSTAT/INTpinoutputsa128μsinterruptpulsetoalertthehostthataninputhasbeenconnected.TheFAULTbitsindicateanormalcondition,andtheSupplyStatusregisterindicatesthatanewsupplyisconnected.TheCEbit(bit1)inthecontrolregister(0x02)indicateswhetherachargecycleisinitiated.Bydefault,thebq2416x(CE=0)enablesachargecyclewhenavalidinputsourceisconnected.WhentheCEbitis'1'andavalidinputsourceisconnected,thebatteryFETisturnedoffandtheSYSoutputisregulatedtotheVSYS(REG)programmedbytheVBATREGthresholdintheI2Cregister.AchargecycleisinitiatedwhentheCEbitiswrittentoa0value(cleared).WhentheCEbitisa0andavalidsourceisconnectedtoINorUSB,thebuckconverterstartsupandachargecycleisinitiated.WhenVBATishighenoughthatVSYS>VSYS(REG),thebatteryFETisturnedonandtheSYSoutputisconnectedtoBAT.IftheSYSvoltagefallstoVSYS(REG),itisregulatedtothatpointtomaintainthesystemoutputevenwithadeeplydischargedorabsentbattery.Inthismode,theSYSoutputvoltageisregulatedbythebuckconverterandthebatteryFETlinearlyregulatesthechargecurrentintothebattery.ThecurrentfromthesupplyissharedbetweenchargingthebatteryandpoweringthesystemloadatSYS.Thedynamicpower-pathmanagement(DPPM)circuitryofthebq2416xmonitorsthecurrentlimitscontinuously,andiftheSYSvoltagefallstotheVMINSYSvoltage,itadjustschargecurrenttomaintaintheminimumsystemvoltageandsupplytheloadonSYS.Ifthechargecurrentisreducedtozeroandtheloadincreasesfurther,thebq2416xentersbattery-supplementmode.Duringsupplementmode,thebatteryFETisturnedonandthebatterysupplementsthesystem

2000DPPMloopDPPMloop8000

1500~850

~Figure23.ExampleDPPMResponse(VSupply=5V,VBAT=3.1V,1.5AInputcurrentVBAT(REG)shouldneverbeprogrammedlessthanVBAT.Ifthebatteryisever5%abovetheregulationthreshold,thebatteryOVPcircuitshutsthe converteroffimmediayandthebatteryFETisturnedontodischargethebatterytosafeoperatinglevels.IfthebatteryOVPconditionexistsforthe1msdeglitch,abatteryOVPfaultisreportedintheI2Cstatusregisters.ThebatteryOVPfaultisclearedwhenthebatteryvoltagedischargesbelowVRCHoriftheICentershi-impedancemode(HZ_MODE=1orCD=1).Alwayswritebq2416xtohighimpedancemodebeforechangingVBATREGtoclearBOVPconditiontoensureproperoperation.BatteryOnlyWhenabatteryvoltagelessthanVBATUVLOisconnectedwithnoinputsource,thebatteryFETisturnedonsimilartosupplementmode.Inthismode,thecurrentisnotregulated;however,thereisashortcircuitcurrentlimit.Iftheshortcircuitlimitisreached,thebatteryFETisturnedoffforthedeglitchtime(tDGL(SC1)).Aftertherecoverytime(tREC(SC1)),thebatteryFETisturnedontotestandseeiftheshorthasbeenremoved.Ifithasnot,theFETturnsoffandtheprocessrepeatsuntiltheshortisremoved.ThisprocessistoprotecttheinternalFETfromovercurrent.IfanexternalFETisusedfordischarge,thebodydiodepreventstheloadonSYSfrombeingdisconnectedfromthebattery.IfthebatteryvoltageislessthanVBATUVLO,thebatteryFET(Q4)remainsoffandBATishigh-impedance.Thispreventsfurtherdischargingofdeeply-dischargedbatteries.BatteryDischargeFETThebq2416xcontainsaMOSFETdrivertodrivethegateofanexternaldischargeFETbetweenthebatteryandthesystemoutput.ThisexternalFETprovidesalowimpedancepathwhensupplyingthesystemfromthebattery.ConnectBGATEtothegateoftheexternaldischargeMOSFET.BGATEisonunderthefollowingconditions:NoinputsupplyHZ_MODE=CDpinconnectedDEFAULTDEFAULTmodeisusedwhenI2Ccommunicationisnotavailable.DEFAULTmodeisenteredinthefollowingWhenthechargerisenabledandVBAT<VBATGDbeforeI2CcommunicationisWhenthewatchdogtimerexpireswithoutaresetfromtheI2CinterfaceandthesafetytimerhasnotWhenthedevicecomesoutofanyfaultcondition(sleepmode,OVP,faultyadaptermode,etc.)beforeI2CcommunicationisestablishedInDEFAULTmode,theI2Cregistersareresettothedefaultvalues.The27-minutesafetytimer(notimerforbq24168)isresetandstartswhenDEFAULTmodeisentered.ThedefaultvalueforVBATREGis3.6V,andthedefaultvalueforICHARGEis1A.TheinputcurrentlimitfortheINinputissetto1.5A.TheinputcurrentlimitfortheUSBinputisdeterminedbytheD+/D–detection(bq24160/3)orPSEL(bq24161/1B/8).PSELandD+/D–detectionhavenoeffectontheINinput.DefaultmodeisexitedbyprogrammingtheI2Cinterface.OnceI2Ccommunicationisestablished,PSELhasnoeffectontheUSBinput.Notethatifterminationisenabledandcharginghasterminated,anewchargecycleisNOTinitiatedwhenenteringDEFAULTmode.SafetyTimerandWatchdogTimer(bq24160/bq24161/bq24161B/bq24163Atthebeginningofchargingprocess,thebq24160/1/1B/3startsthesafetytimer.Thistimerisactiveduringtheentirechargingprocess.Ifcharginghasnotterminatedbeforethesafetytimerexpires,chargingisdisabled,thechargeparametersareresettothedefaultvaluesandtheCEbitiswrittentoa“1”.ThelengthofthesafetytimerisselectableusingtheI2Cinterface.Asingle128μspulseissentontheSTATandINToutputsandtheSTATxbitsofthestatusregistersareupdatedintheI2C.InDEFAULTmode,thesafetytimercanberesetandanewchargeinitiatedbyremoving/insertingtheinputsupplyortogglingtheCDpin.InHOSTmode,theCEbitissettoa'1'when