bq2014HLow-CostNiCd/NiMHGasGaugeICFeatures
➤Accurate measurement of avail-able capacity in NiCd or NiMHbatteries➤Low-cost battery management so-lution for pack integration
GeneralDescription
Thebq2014HNiCd/NiMHGasGaugeICisintendedforbattery-packorin-systeminstallationtomaintainanaccuraterecordofavailablebatterycapacity.TheICmonitorsavoltagedropacrossasenseresistorconnectedinseriesbetweenthenegativebatterytermi-nalandgroundtodeterminechargeanddischargeactivityofthebattery.Compensationsforbat-terytemperature,self-discharge,andrateofdischargeareappliedtothechargecountertoprovideavail-ablecapacityinformationacrossawiderangeofoperatingconditions.Batterycapacityisautomaticallyre-calibrated,or“learned,”inthecourseofadischargecyclefromfulltoempty.
Nominalavailablecapacitymaybedirectlyindicatedusingafive-segmentLEDdisplay.Thebq2014Halsosupportsasimplesingle-line
bidirectionalseriallinktoanexter-nalprocessor(commonground).The5kb/sHDQbusinterfacereducescommunicationsoverheadintheexternalmicrocontroller.
Internalregistersincludeavailablecapacityandenergy,temperature,voltageandcurrent,andbatterystatus.Theexternalprocessormayalsooverwritesomeofthebq2014Hgasgaugedataregisters.
Thebq2014Hcanoperatefromthebatteriesinthepack.TheREFout-putandanexternaltransistorallowasimple,inexpensivevoltageregu-latortosupplypowertothecircuitfromthecells.
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As little as12square inch ofPCB for complete circuitLowoperatingcurrent(120µAtypical)
Less than 100nA of dataretention current
➤High-speed (5kb/s) single-wirecommunication interface (HDQbus) for critical batteryparameters➤Communication with an externalcharge controller such as thebq2004➤DirectdriveofremainingcapacityLEDs➤Automaticrateandtemperaturecompensationofmeasurements➤16-pin narrowSOIC
Pin ConnectionsPin NamesLCOMLEDcommonoutputVSSSRDISPSBRBIHDQNCREFVCCSystemgroundSenseresistorinputDisplaycontrolinputBatterysenseinputRegisterbackupinputSerialcommunicationsinput/outputNoconnectVoltagereferenceoutputSupplyvoltageSEG1/PROG1LEDsegment1/program1inputSEG2/PROG2LEDsegment2/program2inputSEG3/PROG3LEDsegment3/program3inputSEG4/PROG4LEDsegment4/program4inputSEG5/PROG5LEDsegment5/program5inputDONEChargecompleteinputLCOMSEG1/PROG1SEG2/PROG2SEG3/PROG3SEG4/PROG4SEG5/PROG5DONEVSS1234 5678161514131211109VCCREFNCHDQRBISBDISPSR16-Pin Narrow SOICPN20140H..epsSLUS030A–JUNE 1999 - REVISED OCTOBER 20031
元器件交易网www.cecb2b.com
bq2014H
DISPPin Descriptions
LCOM
LEDcommonoutput
Open-drainoutputthatswitchesVLEDs.TheswitchCCtosourcecurrentfortheisoffduringinitializationtoallowreadingofthesoftpull-uporpull-downprogramresis-tors.LCOMisalsohighimpedancewhentheSB
displayisoff.
SEG1–LEDdisplaysegmentoutputs(dualfunc-SEG5
tionwithPROG1–PROG5)
OutputsthateachmayactivateanLEDtosinkthecurrentsourcedfromLCOM.
RBI
PROGProgrammedfullcountselectioninputsPROG1–2
(dualfunctionwithSEG1–SEG2)
Three-levelinputpinsthatdefinethepro-grammedfullcount(PFC)thresholdsde-scribedinTable2.
HDQ
PROG3–Powergaugescaleselectioninputs(dualPROG4
functionwithSEG3–SEG4)
Three-levelinputpinsthatdefinethescaleNCfactordescribedinTable2.
REF
PROG5
Self-dischargerateselection(dualfunc-tionwithSEG5)
Three-levelinputpinthatdefinestheself-dischargeandbattery-compensationfac-VCC
torsasshowninTable1.
DONE
Chargecompleteinput
Communicatesthestatusofanexternalcharge-controllersuchasthebq2004Fast-ChargeICtothebq2014H.Note:ThispinmustbepulleddowntoVSSusinga200kΩresistor.
VSSGround
SR
Senseresistorinput
Thevoltagedrop(VSR)acrossthesensere-sistorRSismonitoredandintegratedovertimetointerpretchargeanddischargeactiv-ity.VSR 2 Displaycontrolinput DISPhighdisablestheLEDdisplay.DISPtiedtoVrectlytoCCallowsPROGVorVXtoconnectdi-pull-downCCSSinsteadofthroughapull-uporresistor.DISPfloatingallowstheLEDdisplaytobeactiveduringcharge.DISPlowactivatesthedisplay.SeeTable1. Secondarybatteryinput Monitorsthebatterycell-voltagepotentialthroughahigh-impedanceresistivedividernetworkforend-of-dischargevoltage(EDV)thresholdsandforbattery-removeddetection. Registerbackupinput Providesbackuppotentialtothebq2014Hreg-isterswhileVabatterycanCCbeconnected≤3V.AstoragetoRBI. capacitororSerialcommunicationinput/outputThisistheopen-drainbidirectionalcommu-nicationsport. Noconnect Voltagereferenceoutput REFprovidesavoltagereferenceoutputforanoptionalmicroregulator. Supplyvoltageinput 元器件交易网www.cecb2b.com bq2014H Functional Description General Operation Thebq2014Hdeterminesbatterycapacitybymoni-toringtheamountofcurrentinputtoorremovedfromarechargeablebattery.Thebq2014Hmea-suresdischargeandchargecurrents,measuresbat-teryvoltage,estimatesself-discharge,monitorsthebatteryforlowbattery-voltagethresholds,andcom-pensatesfortemperatureandcharge/dischargerate.Currentmeasurementismadebymonitoringthevoltageacrossasmall-valueseriessenseresistorbe-tweenthenegativebatteryterminalandground.Thebq2014Hcompensatesthenominalavailablecapacityregisterfordischargerateandtempera-tureandreportsthecompensatedavailablecapacity.Thebq2014Husesthecompensatedavailable capacitytodrivetheLEDdisplay.Inaddition,thebq2014Hestimatestheavailableenergyusingtheaver-agebatteryvoltageduringthedischargecycleandre-mainingcompensatedavailablecapacity. Figure1showsatypicalbatterypackapplicationofthebq2014HusingtheLEDdisplaycapabilityasacharge-stateindicator.Thebq2014Hisconfiguredtodisplaycapacityinrelativedisplaymode.Therelativedisplaymodeusesthelastmeasureddischargecapacityofthebatteryasthebattery“full”reference.Apush-buttondisplayfeatureisavailableformomentarilyenablingtheLEDdisplay. Thebq2014Hmonitorsthechargeanddischargecur-rentsasavoltageacrossasenseresistor.(SeeRSinFig-ure1.)AfilterbetweenthenegativebatteryterminalandtheSRpinisrequired. R1bq2014HGas-Gauge ICREFC1LCOMSEG1/PROG1SEG2/PROG2SEG3/PROG3SEG4/PROG4SEG5/PROG5DONEVSSRBIHDQ1MDISPSR100K0.1µFVCCSBVCCQ1ZVNL110AVCCC2RB1RB2RSSee note 4Notes:1. Indicates optional.2. Programming resistors (5 max.) and ESD-protection diodes are not shown.3. RC on SR is required.4. A series diode is required on RBI if the bottom series cell is used as the backup source. If the cell is used, the backup capacitor is not required, and the anode is connected to the positive terminal of the cell.ChargerLoadF2014HBP.epsFigure 1.Battery Pack Application Diagram—LED Display 3 元器件交易网www.cecb2b.com bq2014H VoltageThresholds InconjunctionwithmonitoringVSRforcharge/dischargecurrents,thebq2014HmonitorsthebatterypotentialthroughtheSBpinfortheend-of-dischargevoltage(EDV)thresholds. TheEDVthresholdlevelsareusedtodeterminewhenthebatteryhasreachedan“empty”state. TheEDVthresholdsforthebq2014Hareprogrammablewiththedefaultvaluesfixedasfollows: EDV1 (first) = 0.76V EDVF(final) = EDV1 - 0.025V = 0.735V Thebatteryvoltagedivider(RB1andRB2inFigure1)isusedtoscalethesevaluestothedesiredthreshold.IfVSBisbeloweitherofthetwoEDVthresholds,theas-sociatedflagislatchedandremainslatched,independ-entofVSB,untilthenextvalidcharge. EDVmonitoringisdisabledifthedischargerateisgreaterthan2C(OVLDFlag=1)andresumes12secondaftertheratefallsbelow2C.TheVSBvalueisavailableovertheserialport. TMP(hex) 0x1x2x3x4x5x6x7x8x9xAxBxCx Temperature Range < -30°C-30°C to -20°C-20°C to -10°C-10°C to 0°C0°C to 10°C10°C to 20°C20°C to 30°C30°C to 40°C40°C to 50°C50°C to 60°C60°C to 70°C70°C to 80°C> 80°C RBIInput TheRBIinputpinisusedwithastoragecapacitororex-ternalsupplytoprovidebackuppotentialtotheinternalbq2014HregisterswhenVCCdropsbelow3.0V.VCCisoutputonRBIwhenVCCisabove3.0V.Ifusinganexter-nalsupply(suchasthebottomseriescell)asthebackupsource,anexternaldiodeisrequiredforisolation. Layout Considerations Thebq2014HmeasuresthevoltagedifferentialbetweentheSRandVSSpins.VOS(theoffsetvoltageattheSRpin)isgreatlyaffectedbyPCboardlayout.Foroptimalresults,thePCboardlayoutshouldfollowthestrictruleofasingle-pointgroundreturn.Sharinghigh-currentgroundwithsmall-signalgroundcausesundesirablenoiseonthesmall-signalnodes.Additionally: I Reset Thebq2014HcanberesetbyremovingVCCandground-ingtheRBIpinfor15secondsorbycommandsovertheserialport.Theserialportresetcommandsequencere-quireswriting00htoregisterPPFC(address=1Eh)andthenwriting00htoregisterLMD(address=05h). Temperature Thebq2014Hinternallydeterminesthetemperaturein10°Cstepscenteredfromapproximately-35°Cto+85°C.Thetemperaturestepsareusedtoadaptchargeanddis-chargeratecompensations,self-dischargecounting,andavailablechargedisplaytranslation. Thetemperaturerangeisavailableovertheserialportin10°Cincrements,asshowninthefollowingtable Thecapacitors(C1andC2)shouldbeplacedascloseaspossibletotheVCCandSBpins,respectively,andtheirpathstoVSSshouldbeasshortaspossible.Ahigh-qualityceramiccapacitorof0.1µFisrecommendedforVCC. Thesense-resistorcapacitorshouldbeplacedascloseaspossibletotheSRpin. Thesenseresistor(RS)shouldbeascloseaspossibletothebq2014H. I I 4 元器件交易网www.cecb2b.com bq2014H Gas Gauge Operation TheoperationaloverviewdiagraminFigure2illustratestheoperationofthebq2014H.Thebq2014Haccumu-latesameasureofchargeanddischargecurrents,aswellasanestimationofself-discharge.Theaccumu-latedchargeanddischargecurrentsareadjustedfortemperatureandratetoprovidetheindicationofcom-pensatedavailablecapacitytothehostsystemoruser.Themaincounter,NominalAvailableCapacity(NAC),representstheavailablebatterycapacityatanygiventime.BatterychargingincrementstheNACregister,whilebatterydischargingandself-dischargedecrementtheNACregisterandincrementtheDCR(DischargeCountRegister). TheDischargeCountRegisterisusedtoupdatetheLastMeasuredDischarge(LMD)registeronlyifacompletebatterydischargefromfulltoemptyoccurswithoutanypartialbatterycharges.Therefore,thebq2014Hadaptsitscapacitydeterminationbasedontheactualcondi-tionsofdischarge. Thebattery'sinitialcapacityequalstheProgrammedFullCount(PFC)showninTable2.UntilLMDisup-dated,NACcountsuptobutnotbeyondthisthresholdduringsubsequentcharges.Thisapproachallowsthegasgaugetobecharger-independentandcompatiblewithanytypeofchargeregime.1. LastMeasuredDischarge(LMD)orlearnedbatterycapacity: LMDisthelastmeasureddischargecapacityofthebattery.Oninitialization(applicationofVCCorbat-teryreplacement),LMD=PFC.Duringsubsequentdischarges,theLMDisupdatedwiththelatestmeasuredcapacityintheDischargeCountRegisterrepresentingadischargefromfulltobelowEDV1.AqualifieddischargeisnecessaryforacapacitytransferfromtheDCRtotheLMDregister.TheLMDalsoservesasthe100%referencethresholdusedbytherelativedisplaymode. InputsChargeCurrentRate andTemperatureCompensationDischargeCurrentSelf-DischargeTimerTemperatureCompensation-Main Countersand CapacityReference (LMD)+-++NominalAvailableCharge(NAC) 元器件交易网www.cecb2b.com bq2014H 2. ProgrammedFullCount(PFC)orinitialbat-terycapacity: TheinitialLMDandgasgaugeratevaluesarepro-grammedbyusingPROG1–PROG4.Thebq2014HisconfiguredforagivenapplicationbyselectingaPFCvaluefromTable2.ThecorrectPFCmaybedeterminedbymultiplyingtheratedbatterycapac-ityinmAhbythesenseresistorvalue:Battery capacity (mAh)*sense resistor (Ω) = PFC (mVh) SelectingaPFCslightlylessthantheratedcapac-ityprovidesaconservativecapacityreferenceuntilthebq2014H“learns”anewcapacityreference. Example:SelectingaPFCValueGiven: Senseresistor=0.05ΩNumberofcells=10 Capacity=3500mAh,NiMHCurrentrange=50mAto1ARelativedisplaymode Self-discharge=NAC47perday@25°C Voltagedropoversenseresistor=2.5mVto50mVNominaldischargevoltage=1.2VTherefore: 3500mAh*0.05Ω= 175mVh Table 1.Self-Discharge and Capacity Compensation PinConnectionHZLPROG5Self-DischargeRateDisabledNACNAC6447DISPDisplay StateLEDs disabledLEDs on when chargingLEDs on for 4sTable 2.bq2014H Programmed Full CountmVh,VSRGain Selections Pro-grammedFullCount(PFC) -491524505640960368643379230720276482560022528 PROGx1-HHHZZZLLL 2-HZLHZLHZL PROG4= L PROG3= HSCALE =1/8061456351246142238434632028290 PROG4= Z or H UnitsmVh/countmVhmVhmVhmVhmVhmVhmVhmVhmVhmV PROG3= ZPROG3= LPROG3= HPROG3= ZPROG3= LSCALE =1/16030728225623021119217316014145 SCALE =1/32015414112811510696.086.480.070.422.5 SCALE =1/64076.870.464.057.653.048.043.240.035.211.25 SCALE =1/128038.435.232.028.826.424.021.620.017.65.6 SCALE =1/256019.217.616.014.413.212.010.810.08.82.8 VSRequivalent to 2counts/s (nom.) 6 元器件交易网www.cecb2b.com bq2014H Select: PFC=27648countsor173mVh PROG1=lowPROG2=highPROG3=floatPROG4=lowPROG5=low Theinitialfullbatterycapacityis173mVh(3460mAh)untilthebq2014H“learns”anewcapac-itywithaqualifieddischargefromfulltoEDV1.3. NominalAvailableCapacity(NAC): NACcountsupduringchargetoamaximumvalueofLMDanddownduringdischargeandself-dis-chargeto0.NACisresetto0oninitializationandonthefirstvalidchargefollowingdischargetoEDV1.Topreventoverstatementofchargeduringperiodsofovercharge,NACstopsincrementingwhenNAC=LMDor0.94∗LMDifT<0°C.4. DischargeCountRegister(DCR): TheDCRcountsupduringdischargeindependentofNACandcouldcontinueincreasingafterNAChasdecrementedto0.PriortoNAC=0(emptybattery),bothdischargeandself-dischargein-crementtheDCR.AfterNAC=0,onlydischargeincrementstheDCR.TheDCRresetsto0whenNAC≥0.94∗LMDandadischargeisdetected.TheDCRdoesnotrolloverbutstopscountingwhenitreachesFFh. TheDCRvaluebecomesthenewLMDvalueonthefirstchargeafteravaliddischargetoVEDV1ifallthefollowingconditionsaremet: I capacityreferenceinbatterychemistrieswithslopedvoltageprofilesduringdischarge.SAEmaybeconvertedtoanmWhvalueusingthefollowingformula: E(mWh) =(SAEH∗256+SAEL)∗ 1.2∗SCALE∗(RB1+RB2) RS∗RB2 whereRB1,RB2,andRSareresistorvaluesinohms,asshowninFigure1.SCALEistheselectedscalefromTable2. 6.CompensatedAvailableCapacity(CACT) CACTcountssimilarlytoNAC,butcontainstheavailablecapacitycompensatedfordischargerateandtemperature. ChargeCounting ChargeactivityisdetectedbasedonapositivevoltageontheSRinput.Ifchargeactivityisdetected,thebq2014HincrementsNACatarateproportionaltoVSRand,ifenabled,activatestheLEDdisplay. Thebq2014HcountschargeactivitywhenthevoltageattheSRinput(VSRO)exceedstheminimumchargethreshold(VSRQ).AvalidchargeisdetectedwhenNAChasbeenupdatedtwicewithoutdischargingorreachingthedigitalmagnitudefiltertime-out.Onceavalidchargeisdetected,chargecountingcontinuesuntilVSR,includingoffset,fallsbelowVSRQ. DischargeCounting DischargeactivityisindicatedbyanegativevoltageontheSRinput.AlldischargecountswhereVSROislessthantheminimumdischargethreshold(VSRD)causetheNACregistertodecrementandtheDCRtoincrement. Novalidchargeinitiations(chargesgreaterthan2NACupdateswhereVSRO>VSRQ)occurredduringtheperiodbetweenNAC≥0.94∗LMDandEDV1. Theself-dischargeislessthan6.25%ofNAC.Thetemperatureis≥0°CwhentheEDV1levelisreachedduringdischarge. ThedischargebeginswhenNAC≥0.94∗LMD.VDQisset. II Self-DischargeCounting Thebq2014HcontinuouslydecrementsNACandincre-mentsDCRforself-dischargeonthebasisoftimeandtem-perature. II Charge/DischargeCurrent Thebq2014Hcurrent-scaleregisters,VSRHandVSRL,canbeusedtodeterminethebatterychargeordis-chargecurrent.SeetheCurrentScaleRegisterdescrip-tionfordetails. Thevaliddischargeflag(VDQ)indicateswhetherthepresentdischargeisvalidforLMDupdate.IftheDCRupdatevalueislessthan0.94∗LMD,LMDwillonlybemodifiedby0.94∗LMD.Thispre-ventsinvalidDCRvaluesfromcorruptingLMD.5. ScaledAvailableEnergy(SAE): SAEisusefulindeterminingtheavailableenergywithinthebattery,andmayprovideamoreuseful 7 元器件交易网www.cecb2b.com bq2014H Count Compensations ChargeCompensation Twochargeefficiencycompensationfactorsareusedfortrickleandfastcharge.Tricklechargeisdefinedasarateofcharge Trickle-ChargeCompensation 0.810.75 Fast-ChargeCompensation 0.940.88 Self-DischargeCompensation Theself-dischargecompensationisprogrammedforanominalrateof164*NACperday,147∗NACperday,ordisabled.Thisistherateforabatterywithinthe20°C–30°Ctemperaturerange(TMPGG=6x).Thisratevariesacross8rangesfrom<10°Cto>70°C,doubling Table 3.Self-Discharge Compensation TemperatureStep< 10°C10–20°C20–30°C30–40°C40–50°C50–60°C60–70°C> 70°CTypical RatePROG5= ZNACNAC256128643216842PROG5= LNAC1889447NACNACNACNACNACNACNACNACNACNAC23.511.85.882.941.47CompensatedAvailableCapacity NACisadjustedforrateofdischargeandtemperaturetoderivetheCACDandCACTvalues. Correctionsfortherateofdischargearemadebyadjust-inganinternaldischargecompensationfactor.Thedis-chargefactorisbasedonthedischargerate.Thiscom-pensationisappliedtoNACtoderivethevalueintheCACDregister. Thecompensationfactorsduringdischargeare: ApproximateDischarge Rate < 2C> 2C Rate Efficiency Factor 100%95% NACNACNACwitheachhighertemperaturestep(10°C).SeeTable3. DigitalMagnitudeFilter Thebq2014Hhasadigitalfiltertoeliminatechargeanddischargecountingbelowasetthreshold.ThethresholdforbothVSRDandVSRQis250µV. Temperaturecompensationduringdischargealsotakesplace.Atlowertemperatures,thecompensationfactorincreasesby0.05foreach10°Ctemperaturerangebelow10°C.ThiscompensationisappliedtoCACDtoderivethevalueintheCACTregister.Thetemperaturecom-pensationfactorfollowstheequation Temperature Efficiency Factor = 1.00 - (0.05∗N)whereN=numberof10°Cstepsbelow10°C.Forexample, T>10°C:Nominalcompensation,N=0 0°C 元器件交易网www.cecb2b.com bq2014H Table 6.bq2014H Current-Sensing Errors SymbolINLINR Parameter Integratednon-linearityerror Integrated non-repeatability error Typical±2±1 Maximum ±4±2 Units%% Notes Add 0.1% per °C above or below 25°Cand 1% per volt above or below 4.25V.Measurement repeatability givensimilar operating conditions. Error Summary CapacityInaccurate TheLMDissusceptibletoerroroninitializationorifnoupdatesoccur.Oninitialization,theLMDvaluein-cludestheerrorbetweentheprogrammedfullcapacityandtheactualcapacity.ThiserrorispresentuntilavaliddischargeoccursandLMDisupdated.(SeetheDCRdescription.)TheothercauseofLMDerrorisbat-terywear-out.Asthebatteryages,themeasuredcapac-itymustbeadjustedtoaccountforchangesinactualbatterycapacity. ACapacityInaccuratecounter(CPI)ismaintainedandincrementedeachtimeavalidchargeoccurs(qualifiedbyNAC;seetheCPIregisterdescription).ItisresetwheneverLMDisupdatedfromtheDCR.Thecounterdoesnotwraparoundbutstopscountingat255.Theca-pacityinaccurateflag(CI)issetifLMDhasnotbeenup-datedfollowing64validcharges. Done Input Acharge-controlICoramicrocontrollerusestheDONEinputtocommunicatechargestatustothebq2014H.WhentheDONEinputisassertedhighonchargecom-pletion,thebq2014HsetsNAC=LMDandVDQ=1.TheDONEinputshouldbemaintainedhighaslongasthechargecontrollerormicrocontrollerkeepsthebat-teriesfull;otherwise,thepinshouldbeheldlow. Communicating with the bq2014H Thebq2014Hincludesasimplesingle-pin(HDQplusre-turn)serialdatainterface.Ahostprocessorusesthein-terfacetoaccessvariousbq2014Hregisters.Batterycharacteristicsmaybeeasilymonitoredbyaddingasin-glecontacttothebatterypack.Theopen-drainHDQpinonthebq2014Hshouldbepulledupbythehostsys-tem,ormaybeleftfloatingiftheserialinterfaceisnotused. Theinterfaceusesacommand-basedprotocol,inwhichthehostprocessorsendsacommandbytetothebq2014H.Thecommanddirectsthebq2014Htoeitherstorethenexteightbitsofdatareceivedtoaregisterspecifiedbythecommandbyteoroutputtheeightbitsofdataspecifiedbythecommandbyte.(SeeFigure4.)Thecommunicationprotocolisasynchronousreturn-to-one.Commandanddatabytesconsistofastreamofeightbitsthathaveamaximumtransmissionrateof5Kbits/sec.Theleast-significantbitofacommandordatabyteistransmittedfirst.Theprotocolissimpleenoughthatitcanbeimplementedbymosthostproces-sorsusingeitherpolledorinterruptprocessing.Datainputfromthebq2014Hmaybesampledusingthepulse-widthcapturetimersavailableonsomemicrocon-trollers. Ifacommunicationerroroccurs(e.g.,tCYCB>250µs),thebq2014HshouldbesentaBREAKtoreinitiatetheserialinterface.ABREAKisdetectedwhentheHDQpinisdriventoalogic-lowstateforatime,tBorgreater.TheHDQpinshouldthenbereturnedtoitsnormalready-highlogicstateforatime,tBR.Thebq2014Hisnowreadytoreceiveacommandfromthehostproces-sor. Current-SensingError Table6showsthenon-linearityandnon-repeatabilityerrorsassociatedwiththebq2014Hcurrentsensing.Table7illustratesthecurrent-sensingerrorasafunc-tionofVOS.Adigitalfilterpreventschargeanddis-chargecountstotheNACregisterwhenVSROisbe-tweenVSRQandVSRD. Table 7.VOS-RelatedCurrent Sense Error (Current = 1A) VOS(µV)50100150180 200.250.500.750.90 Sense Resistor501000.100.050.200.100.300.150.360.18 mΩ %%%% 9 元器件交易网www.cecb2b.com bq2014H Thereturn-to-onedatabitframeconsistsofthreedis-tinctsections:1. Thefirstsectionisusedtostartthetransmissionbyeitherthehostorthebq2014HtakingtheHDQpintoalogic-lowstateforaperiod,tSTRH;B. Thenextsectionistheactualdatatransmission,wherethedatashouldbevalidbyaperiod,tDSU;B,afterthenegativeedgeusedtostartcommunica-tion.Thedatashouldbeheldforaperiod,tDH;DV,toallowthehostorbq2014Htosamplethedatabit.ThefinalsectionisusedtostopthetransmissionbyreturningtheHDQpintoalogic-highstatebyatleastaperiod,tSSU;B,afterthenegativeedgeusedtostartcommunication.Thefinallogic-highstateshouldbeuntilaperiodtCYCH;B,toallowtimetoen-surethatthebittransmissionwasstoppedprop-erly.Thetimingsfordataandbreakcommunicationaregivenintheserialcommunicationtimingspeci-ficationandillustrationsections. 0 The bq2014H outputs the requested regis-ter contents specified by the address por-tion of command code. The following eight bits should be writtento the register specified by the address por-tion of command code. 1 2. Thelower7-bitfieldofthecommandcodecontainstheaddressportionoftheregistertobeaccessed: Command Code Bits 7-6 5 4AD4 3AD3 2AD2 1AD1 0AD0(LSB) 3. AD6AD5 PrimaryStatusFlagsRegister(FLGS1) TheFLGS1register(address=01h)containsthepri-marybq2014Hflags. Thechargestatusflag(CHGS)isassertedwhenavalidchargerateisdetected.ChargerateisdeemedvalidwhenVSRO>VSRQ.AVSROoflessthanVSRQordischargeactivityclearsCHGS.TheCHGSvaluesare FLGS1 Bits 7CHGS 6-5-4-3-2-1-0- Communicationwiththebq2014Hisalwaysperformedwiththebittransmittedfirst.Figure5showsanexampleofacommunicationsequencetoreadthebq2014HNACHregister. bq2014H Command Code andRegisters Thebq2014HstatusregistersarelistedinTable8andde-scribedbelow.AllregistersareRead/Writeinthebq2014H.Caution:Whenwritingtobq2014Hregistersensurethatproperdataarewritten.Awrite-verifyreadisrecommended. whereCHGSis01 Either discharge activity detected orVSRO≤VSRQVSRO>VSRQ CommandCode Thebq2014Hlatchesthecommandcodewheneightvalidcommandbitshavebeenreceivedbythebq2014H.Thecommandcodecontainstwofields: II W/Rbit Commandaddress Thebatteryreplacedflag(BRP)isassertedwheneverthebq2014HisreseteitherbyapplicationofVCCorbyaserialportcommand.BRPisresetwheneitheravalidchargeactionincrementsNACtobeequaltoLMD,oravalidchargeactionisdetectedaftertheEDV1flagisas-serted.BRP=1signifiesthatthedevicehasbeenreset.TheBRPvaluesare FLGS1 Bits 7-6BRP 5-4-3-2-1-0- TheW/Rbitofthecommandcodeisusedtoselectwhetherthereceivedcommandisforareadorawritefunction:TheW/Rvaluesare Command Code Bits 7W/R6-5-4-3-2-1-0- whereBRPis01 Battery is charged untilNAC=LMDor dis-charged until the EDV1 flag is assertedbq2014H is reset whereW/Ris 4-10 元器件交易网www.cecb2b.com bq2014HSend Host to bq-HDQCDMRSend Host to bq-HDQ orReceive from bq-HDQDatatRRAddressBreakLSBBit0R/WMSBBit7tRSPSStart-bitAddress-Bit/Data-BitStop-BitTD201807.epsFigure 4.bq2014H Communication ExampleWritten by Host to bq2014HCMDR = 03hLSBMSBReceived by Host to bq2014HNACH = 65hLSBMSBBreak1100000010100110HDQtRSPSTD2014Hcom.epsFigure 5.Typical Communication with the bq2014H11 元器件交易网www.cecb2b.com bq2014H Table 8.bq2014H Command and Status Registers SymbolFLGS1 Register Name Loc.Read/Control Field(hex)Write7(MSB)6543210(LSB)Primary status flags 01hRCHGSBRP0CIVDQ1EDV1EDVF register TMPTemperature register02hRTMP3TMP2TMP1TMP0GG3GG2GG1GG0 Nominalavailablecapac-NACH03hR/WNACH7NACH6NACH5NACH4NACH3NACH2NACH1NACH0 ityhighbyteregisterNominalavailable NACL17hR/WNACL7NACL6NACL5NACL4NACL3NACL2NACL1NACL0 capacitylowbyteregisterBatteryidentification BATID04hR/WBATID7BATID6BATID5BATID4BATID3BATID2BATID1BATID0 register Last measured LMD05hR/WLMD7LMD6LMD5LMD4LMD3LMD2LMD1LMD0 discharge register Secondary status flags FLGS206hRRSVDDR2DR1DR0ENINTVQRSVDOVLD register Program pin pull-down PPD07hRRSVDRSVDRSVDPPD5PPD4PPD3PPD2PPD1 register Program pin pull-up PPU08hRRSVDRSVDRSVDPPU5PPU4PPU3PPU2PPU1 registerCapacity CPI09hR/WCPI7CPI6CPI5CPI4CPI3CPI2CPI1CPI0 inaccuratecountregisterBattery voltage VSB0bhRVSB7VSB6VSB5VSB4VSB3VSB2VSB1VSB0 register End-of-dischargethresh-VTS0chR/WVTS7VTS6VTS5VTS4VTS3VTS2VTS1VTS0 oldselectregisterTemperatureanddis-CACTchargeratecompensated0dhR/WCACT7CACT6CACT5CACT4CACT3CACT2CACT1CACT0 availablecapacityDischarge rate com-CACDpensated available0ehR/WCACD7CACD6CACD5CACD4CACD3CACD2CACD1CACD0 capacity Scaledavailableenergy SAEH0fhRSAEH7SAEH6SAEH5SAEH4SAEH3SAEH2SAEH1SAEH0 high byte register Scaledavailableenergy SAEL10hRSAEL7SAEL6SAEL5SAEL4SAEL3SAEL2SAEL1SAEL0 low byte register RCACRelative CAC11hR-RCAC6RCAC5RCAC4RCAC3RCAC2RCAC1RCAC0VSRHCurrent scale high12hRVSRH7VSRH6VSRH5VSRH4VSRH3VSRH2VSRH1VSRH0VSRLCurrent scale low13hRVSRL7VSRL6VSRL5VSRL4VSRL3VSRL2VSRL1VSRL0DCRDischarge register18hR/WDCR7DCR6DCR5DCR4DCR3DCR2DCR1DCR0PPFCProgram pin data1ehR/WRSVDRSVDRSVDRSVDRSVDRSVDRSVDRSVDINTSSVOSInterrupt38hR/WRSVDRSVDRSVDRSVDDCHGIRSVDRSVDCHGINotes:RSVD= reserved. All other registers not documented are reserved. 12 元器件交易网www.cecb2b.com bq2014H TheEDV1valuesare Thecapacityinaccurateflag(CI)isusedtowarnthe userthatthebatteryhasbeenchargedasubstantialnumberoftimessinceLMDhasbeenupdated.TheCIflagisassertedonthe64thchargeafterthelastLMDupdateorwhenthebq2014Hisreset.TheflagisclearedafteranLMDupdate.TheCIvaluesare FLGS1 Bits 7-6-5-4CI 3-2-1-0-FLGS1 Bits 7-6-5-4-3-2-1EDV1 0- whereEDV1is01 Valid charge action detected,VSB≥VTSVSB WhenLMDis updated with a valid full dis-charge After the 64th valid charge action with noLMDupdates or the bq2014H is reset Thefinalend-of-dischargewarningflag(EDVF)flagisusedtowarnthatbatterypowerisatafailurecondi-tion.Allsegmentdriversareturnedoff.TheEDVFflagislatcheduntilavalidchargehasbeendetected.TheEDVFthresholdisset25mVbelowtheEDV1threshold.TheEDVFvaluesare FLGS1 Bits 7-6-5-4-3-2-1-0EDVF Thevaliddischargeflag(VDQ)isassertedwhenthebq2014HisdischargedfromNAC=0.94∗LMD.TheflagremainssetuntileitherLMDisupdatedoroneofthreeactionsthatcanclearVDQoccurs: I WhenNAChas been reduced by more than 6.25%because of self-discharge sinceVDQwas set. AvalidchargeactionissustainedatVSRO>VSRQforatleast2NACupdates. TheEDV1flagwassetatatemperaturebelow0°C whereEDVFis01 Validchargeactiondetected,VSB≥(VTS-25mV)VSB< (VTS-25mV) providing the dischargerate is < 2C I I TemperatureRegister(TMP) TheTMPregister(address=02h)containsthebatterytemperature. TheVDQvaluesare FLGS1 Bits 7-6-5-4-3VDQ 2-1-0- whereVDQis0 Self-discharge of more than 6.25% ofNAC,valid charge action detected,EDV1 assertedwith the temperature less than 0°C,or resetOn first discharge afterNAC≥0.94∗LMD Thebq2014Hcontainsaninternaltemperaturesensor.Thetemperatureisusedtosetchargeanddischargeef-ficiencyfactorsaswellastoadjusttheself-dischargeco-efficient.ThetemperatureregistercontentsmaybetranslatedasshowninTable9. TMPTemperature Bits 7 6 5 4 3-2-1-0- 1 TMP3TMP2TMP1TMP0 Thefirstend-of-dischargewarningflag(EDV1)warnstheuserthatthebatteryisalmostempty.Thefirstsegmentpin,SEG1,ismodulatedata4HzrateifthedisplayisenabledonceEDV1isasserted,whichshouldwarntheuserthatlossofbatterypowerisimmi-nent.TheEDV1flagislatcheduntilavalidchargehasbeendetected.TheEDV1thresholdisexternallycon-trolledviatheVTSregister(seeVoltageThresholdReg-ister). Thebq2014Hcalculatesthegasgaugebits,GG3-GG0asafunctionofCACTandLMD.Theresultsofthecalculationgiveavailablecapacityin116incrementsfrom0to1516. TMPGas Gauge Bits 7-6-5-4-3GG3 2GG2 1GG1 0GG0 13 元器件交易网www.cecb2b.com bq2014H IfDCR<0.94LMD,thenLMDissetto0.94∗LMD. Table 9.Temperature Register TMP30000000011111 TMP20000111100001 TMP10011001100110 TMP00101010101010 TemperatureT<-30°C-30°C < T < -20°C-20°C < T < -10°C-10°C < T < 0°C0°C < T < 10°C10°C < T < 20°C20°C < T < 30°C30°C < T < 40°C40°C < T < 50°C50°C < T < 60°C60°C < T < 70°C 70°C < T < 80°C T>80°C SecondaryStatusFlagsRegister(FLGS2) TheFLGS2register(address=06h)containsthesecon-darybq2014Hflags. Bit7andbit1ofFLGS2arereserved.Donotwritetothesebits. Thedischargerateflags,DR2–0,arebits6–4. FLGS2 Bits543DR1DR0- 7 -6DR22-1- 0 Theyareusedtodeterminethecurrentdischargere-gimeasfollows:DR2000 DR1001 DR0010 Discharge RateDRATE<0.5C0.5C≤DRATE<2C2C TheNACHhigh-byteregister(address=03h)andtheNACLlow-byteregister(address=17h)arethemaingasgauging registers for the bq2014H.TheNACregisters are incrementedduringchargeactionsanddecrementeddur-ingdischargeandself-dischargeactions.NACHand NACLaresetto0duringabq2014Hreset. WritingtotheNACregistersaffectstheavailablechargecountsand,therefore,affectsthebq2014Hgasgaugeopera-tion.DonotwritetheNACregisterstoavaluegreaterthanLMD. Theenableinterruptflag(ENINT)isatestbitusedtodetermineVSRactivitysensedbythebq2014H.Thestateofthisbitwillvaryandshouldbeignoredbythesystem. FLGS2 Bits543--ENINT 7-6-2-1- 0Thevalidchargeflag(VQ),bit2ofFLGS2,isusedtoindicatewhetherthebq2014Hrecognizesavalidchargecondition.ThisbitisresetonthefirstdischargeafterNAC=LMD.TheVQvaluesare FLGS2 Bits543--- BatteryIdentificationRegister(BATID) TheBATIDregister(address=04h)isavailableforusebythesystemtodeterminethetypeofbatterypack.TheBATIDcontentsareretainedaslongasVRBIisgreaterthan2V.ThecontentsofBATIDhavenoeffectontheoperationofthebq2014H.Thereisnodefaultsettingforthisregister. 7-6-2VQ1- 0 whereVQis01 Valid charge action not detected between adischarge fromNAC=LMDand EDV1Valid charge action detected LastMeasuredDischargeRegister(LMD) LMDistheregister(address=05h)thatthebq2014Husesasameasuredfullreference.Thebq2014HadjustsLMDbasedonthemeasureddischargecapacityofthebatteryfromfulltoempty.Inthiswaythebq2014Hup-datesthecapacityofthebattery.LMDissettoPFCduringabq2014Hreset. LMDissettoDCRuponthefirstvalidchargeafterEDVissetifVDQisset. Theoverloadflag(OVLD)isassertedwhenadischargerateinexcessof2Cisdetected.OVLDremainsassertedaslongastheconditionpersistsandiscleared0.5sec-ondsaftertheratedropsbelow2C.Theoverloadcondi-tionisusedtostopsamplingofthebatteryterminalchar-acteristicsforend-of-dischargedetermination. 14 元器件交易网www.cecb2b.com bq2014H FLGS2 Bits43-- 7-6-5-2-1-0OVLD BatteryVoltageRegister(VSB) Thebatteryvoltageregisterisusedtoreadthesingle-cellbatteryvoltageontheSBpin.TheVSBregister(address=0Bh)isupdatedapproximatelyoncepersecondwiththepresentvalueofthebatteryvoltage.VSB=1.2V*(VSB/256). VSBRegister Bits 7 6 5 4 3 2 1 0 VSB7VSB6VSB5VSB4VSB3VSB2VSB1VSB0 ProgramPinPull-DownRegister(PPD) ThePPDregister(address=07h)containssomeofthepro-grammingpininformationforthebq2014H.Thesegmentdrivers,SEG1–5,haveacorrespondingPPDregisterloca-tion,PPD1–5.Agivenlocationissetifapull-downresistorhasbeendetectedonitscorrespondingsegmentdriver.Forexample,ifSEG1andSEG4havepull-downresistors,thecontentsofPPDarexxx01001. ProgramPinPull-UpRegister(PPU) ThePPUregister(address=08h)containstherestoftheprogrammingpininformationforthebq2014H.Theseg-mentdrivers,SEG1–5,haveacorrespondingPPUregisterlocation,PPU1–5.Agivenlocationissetifapull-upresis-torhasbeendetectedonitscorrespondingsegmentdriver.Forexample,ifSEG3andSEG5havepull-upresistors,thecontentsofPPUarexxx10100. PPD/PPUBits 7 6 5 4 3 2 1 0 VoltageThresholdRegister(VTS) Theend-of-dischargethresholdvoltages(EDV1andEDVF)canbesetusingtheVTSregister(address=0Ch).TheVTSregistersetstheEDV1trippoint.EDVFisset25mVbelowEDV1.ThedefaultvalueintheVTSregisterisA2h,representingEDV1=0.76VandEDVF=0.735V.EDV1=1.2V*(VTS/256). VTSRegister Bits 7 6 5 4 3 2 1 0 VTS7VTS6VTS5VTS4VTS3VTS2VTS1VTS0 RSVDRSVDRSVDPPU5PPU4PPU3PPU2PPU1RSVDRSVDRSVDPPD5PPD4PPD3PPD2PPD1 CompensatedAvailableChargeRegisters(CACT/CACD) TheCACDregister(address=0Eh)containstheNACvaluecompensatedfordischargerate.Thisisamono-toniclydecreasingvalueduringdischarge.Ifthedis-chargerateis>2CthenthisvalueislowerthanNAC.CACDisupdatedonlywhenthedischargeratecompen-satedNACvalueisalowervaluethanCACDduringdischarge.Duringcharge,CACDiscontinuouslyup-datedwiththeNACvalue. TheCACTregister(address=0Dh)containstheCACDvaluecompensatedfortemperature.CACTwillcontainavaluelowerthanCACDwhenthebatterytemperatureisbelow10°C.TheCACTvalueisalsousedincalculat-ingtheLEDdisplaypattern. CapacityInaccurateCountRegister(CPI) TheCPIregister(address=09h)isusedtoindicatethenumberoftimesabatteryhasbeenchargedwithoutanLMDupdate.Becausethecapacityofarechargeablebatteryvarieswithageandoperatingconditions,thebq2014Hadaptstothechangingcapacityovertime.Acompletedischargefromfull(NAC≥0.94∗LMD)toempty(EDV1=1)isrequiredtoperformanLMDupdateassumingtherehavebeennointerveningvalidcharges,thetemperatureisgreaterthanorequalto0°C,andtherehasbeennomorethana6%self-dischargereduction. TheCPIregisterisincrementedeverytimeavalidchargeisdetected.WhenNAC≥0.94*LMD,however,theCPIregisterincrementsonthefirstvalidcharge;CPIdoesnotincrementagainforavalidchargeuntilNAC<0.94*LMD.ThispreventscontinuoustricklechargingfromincrementingCPIifself-dischargedecre-mentsNAC.TheCPIregisterincrementsto255with-outrollingover.WhenthecontentsofCPIareincre-mentedto64,thecapacityinaccurateflag,CI,isas-sertedintheFLGS1register.TheCPIregisterisresetwheneveranupdateoftheLMDregisterisperformed,andtheCIflagisalsocleared. ScaledAvailableEnergyRegisters(SAEH/SAEL) TheSAEHhigh-byteregister(address=0Fh)andtheSAELlow-byteregister(address=10h)areusedtoscalebatteryvoltageandCACTtoavaluethatcanbetrans-latedtowatt-hoursremainingunderthepresentcondi-tions. RelativeCACRegister(RCAC) TheRCACregister(address=11h)providestherelativebatterystate-of-chargebydividingCACTbyLMD. 15 元器件交易网www.cecb2b.com bq2014H RCACvariesfrom0to64hrepresentingrelativestate-of-chargefrom0to100%. VoltageOffset(VOS)Interrupt(INTSS) TheINTSSregister(address=38h)isusefulduringin-tialcharacterizationofbq2014Hdesigns.Whenthebq2014Hcountsachargepulse,CHGI(bit0)willbesetto1.Whenthebq2014Hcountsadischargepulse,DCHGI(bit3)willbesetto1.AllotherlocationsintheINTSSregisterarereserved. CurrentScaleRegister(VSRH/VSRL) TheVSRHregister(address=12h)andtheVSRLregis-ter(address=13h)reporttheaveragesignalacrosstheSRandVSSpins.Thebq2050Hupdatesthisregisterpairevery22.5s.VSRH(high-byte)andVSRL(low-byte)forma16-bitsignedintegervaluerepresentingtheaver-agecurrentduringthistime.Thebatterypackcurrentcanbecalculatedfrom: |I(mA)| = (VSRH∗256 +VSRL)/(8∗RS)where: RS= sense resistor value inΩ. VSRH= high-byte value of battery currentVSRL= low-byte value of battery current Thebq2014Hindicatesanaveragedischargecurrentwitha“1”intheMSBpositionoftheVSRHregister.Tocalculatedischargecurrent,usethe2’scomplementiftheconcatenatedregistercontentsintheaboveequa-tion. Display Thebq2014Hcandirectlydisplaycapacityinformationusinglow-powerLEDs.IfLEDsareused,theprogrampinsshouldberesistivelytiedtoVCCorVSSforapro-gramhighorprogramlow,respectively. Thebq2014Hdisplaysthebatterychargestateinrelativemode.Inrelativemode,thebatterychargeisrepresentedasapercentageoftheLMD.EachLEDsegmentrepre-sents20%oftheLMD. Thecapacitydisplayisalsoadjustedforthepresentbat-terytemperatureanddischargerate.ThetemperatureadjustmentreflectstheavailablecapacityatagiventemperaturebutdoesnotaffecttheNACregister.ThetemperatureadjustmentsaredetailedintheCACTandCACDregisterdescriptions. WhenDISPistiedtoVCC,theSEG1–5outputsareinac-tive.WhenDISPisleftfloating,thedisplaybecomesac-tivewheneverthebq2014HdetectsachargeinprogressVSRO>VSRQ.Whenpulledlow,thesegmentoutputsbe-comeactiveforaperiodoffourseconds,±0.5seconds.Thesegmentoutputsaremodulatedastwobanks,withsegments1,3,and5alternatingwithsegments2and4.Thesegmentoutputsaremodulatedatapproximately100Hzwitheachsegmentbankactivefor30%ofthepe-riod. SEG1blinksata4HzratewheneverVSBhasbeende-tectedtobebelowVEDV1(EDV1=1),indicatingalow-batterycondition.VSBbelowVEDVF(EDVF=1)disablesthedisplayoutput. DischargeCountRegister(DCR) TheDCRregister(address=18h)storesthehigh-byteofthedischargecount.DCRisresettozeroatthestartofavaliddischargecycleandcancounttoamaximumofFFh.DCRwillnotincrementifEDV1=1andwillnotrolloverfromFFh. ProgramPinFullCount(PPFC) ThePPFCregistercontainsinformationconcerningtheprogrampinconfiguration.Thisinformationisusedtodeterminethedataintegrityofthebq2014H.Theonlyapproveduserapplicationforthisregisteristowriteazerotothisregisteraspartofaresetre-quest. Therecommendedresetmethodforthebq2014His II WritePPFCtozeroWriteLMDtozero Microregulator Amicropowersourceforthebq2014Hcanbeinexpen-sivelybuiltusingaFETandanexternalresistor.(SeeFigure1.) Aftertheseoperations,asoftwareresetwilloccur.Resettingthebq2014Hsetsthefollowing: II LMD=PFC CPI,VDQ,RCAC,NACH/L,CACH/L,SAEH/L,NMCV=0CIandBRP=1 I 16 元器件交易网www.cecb2b.com bq2014H Absolute Maximum Ratings SymbolVCC All other pinsREFVSRTOPRNote: ParameterRelative toVSSRelative toVSSRelative toVSSRelative toVSS Operating temperature Minimum-0.3-0.3-0.3-0.30 Maximum+7.0+7.0+8.5Vcc+0.7+70 UnitVVVV°C Current limited by R1 (see Figure 1)100kΩseries resistor should be used toprotect SR in case of a shorted battery.Commercial Notes Permanent device damage may occur ifAbsolute Maximum Ratingsare exceeded.Functional operation should be limited to the Recommended DC Operating Conditions detailed in this data sheet.Exposure to conditions beyond the operational limits for extended periods of time may affect device reli-ability. DC Voltage Thresholds(TA=TOPR; V = 3.0 to 6.5V) SymbolVEDV1VEDVFVSROVSRQVSRDNote: ParameterFirst empty warningFinal empty warningSR sense rangeValid chargeValid discharge Minimum0.73VEDV1- 0.035 -300250-Typical0.76VEDV1- 0.025 ---Maximum0.79VEDV1- 0.015 +500--250 UnitVVmVµVµV Notes SB,defaultSB,defaultSR,VSR+VOSVSR+VOS(see note)VSR+VOS(see note) VOSisaffectedbyPCboardlayout.Properlayoutguidelinesshouldbefollowedforoptimalperformance.See “LayoutConsiderations.” 17 元器件交易网www.cecb2b.com bq2014H DC Electrical Characteristics(TA=TOPR) SymbolVCCVOSVREFRREFICCVSBRSBmaxIDISPILCOMIRBIRHDQRSRVIHPFCVILPFCVIZPFCVOLSLVOLSHVOHMLVOHMHIOLSIOLVOLVIHDQVILDQRPROGRFLOATNote: Parameter Supply voltageOffset referred toVSRReference at 25°C Reference at -40°C to +85°CReference input impedanceNormal operation Battery input SB input impedanceDISPinput leakageLCOMinput leakage RBI data retention currentInternalpulldownSR input impedanceLogic input highLogic input lowLogic input Z SEGoutputlow,lowVCCSEGoutputlow,highVCC Mini-mum3.0-5.74.52.0---010--0.2-50010VCC- 0.2 -float --TypicalMaximumUnit4.25±506.0-5.090120170----------0.10.4--------5 6.5±1506.37.5-135180250VCC-50.2100---VSS+ 0.2float ------0.3-0.8200-VµVVVMΩµAµAµAVMΩµAµAnAKΩMΩVVVVVVVmAmAVVVKΩMΩ Notes VCCexcursion from < 2.0V to≥3.0V initializes the unit.DISP=VCCIREF= 5µAIREF= 5µAVREF= 3V VCC= 3.0V,HDQ= 0VCC= 4.25V,HDQ= 0VCC= 6.5V,HDQ= 00 -200mV VCC= 6.5V,IOLS≤11.0mASEG1–SEG5 VCC=3V,IOHLCOM=-5.25mAVCC>3.5V,IOHLCOM=-33.0mAAtVOLSH= 0.4V, VCC= 6.5VAt VOL=VSS+ 0.3V, HDQIOL≤5mA,HDQHDQHDQPROG1–5PROG1–5LCOMoutput high, lowVCCVCC- 0.3LCOMoutput high, highVCCVCC- 0.6SEGsink current11.0Open-drain sink current5.0Open-drain output low-HDQinput high2.5HDQinput low-Softpull-uporpull-downresis--torvalue(forprogramming)Float state external impedance-All voltages relative toVSS. 18 元器件交易网www.cecb2b.com bq2014H High-Speed Serial Communication Timing Specification(TA=TOPR) SymboltCYCHtCYCBtSTRHtSTRBtDSUtDSUBtDHtDVtSSUtSSUBtRSPStBtBRNote: Parameter Cycle time, host to bq2014H (write)Cycle time, bq2014H to host (read)Start hold, host to bq2014H (write)Start hold, bq2014H to host (read)Data setupData setupData holdData validStop setupStop setup Response time, bq2014H to hostBreak Break recovery Minimum190190532--90---19019040 TypicalMaximum -205------------250--5050-80145145320--Unitµsµsnsµsµsµsµsµsµsµsµsµsµs NotesSee note The open-drainHDQpin should be pulled to at leastVCCby the host system for properHDQoperation.HDQmay be left floating if the serial interface is not used. 19 元器件交易网www.cecb2b.com bq2014HBreak TimingtBtBRTD201803.epsHost to bq2014HWrite \"1\" Write \"0\" tSTRHtDSUtDHtSSUtCYCHbq2014H to HostRead \"1\" Read \"0\" tSTRBtDSUBtDVtSSUBtCYCB20 元器件交易网www.cecb2b.com bq2014H 16-PinSOICNarrow (SN) 16-PinSN(0.150\"SOIC)DeBInchesDimensionAA1Min.0.0600.0040.0130.0070.3850.1500.0450.2250.015Max.0.0700.0100.0200.0100.4000.1600.0550.2450.035MillimetersMin.1.520.100.330.189.783.811.145.720.38Max.1.780.250.510.2510.164.061.406.220.89EHBCDECAA1.004LeHLOrdering Informationbq2014HTemperatureRange:blank=Commercial(0to+70°C)PackageOption:SN=16-pinnarrowSOICDevice:bq2014HGas-GaugeIC21 元器件交易网www.cecb2b.com PACKAGEOPTIONADDENDUM www.ti.com 25-Jun-2008 PACKAGINGINFORMATION OrderableDeviceBQ2014HSNBQ2014HSNG4BQ2014HSNTRBQ2014HSNTRG4 (1) Status(1)ACTIVEACTIVEACTIVEACTIVE PackageTypeSOICSOICSOICSOIC PackageDrawing DDDD PinsPackageEcoPlan(2) Qty16161616 4040 Green(RoHS&noSb/Br)Green(RoHS&noSb/Br) Lead/BallFinishCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAU MSLPeakTemp(3)Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEAR 2500Green(RoHS& noSb/Br)2500Green(RoHS& noSb/Br) Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns. LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect. NRND:Notrecommendedfornewdesigns.Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign. PREVIEW:Devicehasbeenannouncedbutisnotinproduction.Samplesmayormaynotbeavailable.OBSOLETE:TIhasdiscontinuedtheproductionofthedevice. (2) EcoPlan-Theplannedeco-friendlyclassification:Pb-Free(RoHS),Pb-Free(RoHSExempt),orGreen(RoHS&noSb/Br)-pleasecheckhttp://www.ti.com/productcontentforthelatestavailabilityinformationandadditionalproductcontentdetails.TBD:ThePb-Free/Greenconversionplanhasnotbeendefined. Pb-Free(RoHS):TI'sterms\"Lead-Free\"or\"Pb-Free\"meansemiconductorproductsthatarecompatiblewiththecurrentRoHSrequirementsforall6substances,includingtherequirementthatleadnotexceed0.1%byweightinhomogeneousmaterials.Wheredesignedtobesolderedathightemperatures,TIPb-Freeproductsaresuitableforuseinspecifiedlead-freeprocesses. Pb-Free(RoHSExempt):ThiscomponenthasaRoHSexemptionforeither1)lead-basedflip-chipsolderbumpsusedbetweenthedieandpackage,or2)lead-baseddieadhesiveusedbetweenthedieandleadframe.ThecomponentisotherwiseconsideredPb-Free(RoHScompatible)asdefinedabove. Green(RoHS&noSb/Br):TIdefines\"Green\"tomeanPb-Free(RoHScompatible),andfreeofBromine(Br)andAntimony(Sb)basedflameretardants(BrorSbdonotexceed0.1%byweightinhomogeneousmaterial) (3) MSL,PeakTemp.--TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature. ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.Effortsareunderwaytobetterintegrateinformationfromthirdparties.TIhastakenandcontinuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease. InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis. Addendum-Page1 元器件交易网www.cecb2b.com PACKAGEMATERIALSINFORMATION www.ti.com 11-Mar-2008 TAPEANDREELINFORMATION *Alldimensionsarenominal Device PackagePackagePinsTypeDrawingSOIC D 16 SPQ ReelReelDiameterWidth(mm)W1(mm)330.0 16.4 A0(mm)B0(mm)K0(mm) P1(mm)8.0 WPin1(mm)Quadrant16.0 Q1 BQ2014HSNTR25006.510.32.1 PackMaterials-Page1 元器件交易网www.cecb2b.com PACKAGEMATERIALSINFORMATION www.ti.com 11-Mar-2008 *Alldimensionsarenominal DeviceBQ2014HSNTR PackageType SOIC PackageDrawing D Pins16 SPQ2500 Length(mm) 346.0 Width(mm)346.0 Height(mm) 33.0 PackMaterials-Page2 元器件交易网www.cecb2b.com 元器件交易网www.cecb2b.com IMPORTANTNOTICE TexasInstrumentsIncorporatedanditssubsidiaries(TI)reservetherighttomakecorrections,modifications,enhancements,improvements,andotherchangestoitsproductsandservicesatanytimeandtodiscontinueanyproductorservicewithoutnotice.Customersshouldobtainthelatestrelevantinformationbeforeplacingordersandshouldverifythatsuchinformationiscurrentandcomplete.AllproductsaresoldsubjecttoTI’stermsandconditionsofsalesuppliedatthetimeoforderacknowledgment. TIwarrantsperformanceofitshardwareproductstothespecificationsapplicableatthetimeofsaleinaccordancewithTI’sstandardwarranty.TestingandotherqualitycontroltechniquesareusedtotheextentTIdeemsnecessarytosupportthiswarranty.Exceptwheremandatedbygovernmentrequirements,testingofallparametersofeachproductisnotnecessarilyperformed. TIassumesnoliabilityforapplicationsassistanceorcustomerproductdesign.Customersareresponsiblefortheirproductsand applicationsusingTIcomponents.Tominimizetherisksassociatedwithcustomerproductsandapplications,customersshouldprovideadequatedesignandoperatingsafeguards. TIdoesnotwarrantorrepresentthatanylicense,eitherexpressorimplied,isgrantedunderanyTIpatentright,copyright,maskworkright,orotherTIintellectualpropertyrightrelatingtoanycombination,machine,orprocessinwhichTIproductsorservicesareused.InformationpublishedbyTIregardingthird-partyproductsorservicesdoesnotconstitutealicensefromTItousesuchproductsorservicesorawarrantyorendorsementthereof.Useofsuchinformationmayrequirealicensefromathirdpartyunderthepatentsorotherintellectualpropertyofthethirdparty,oralicensefromTIunderthepatentsorotherintellectualpropertyofTI. ReproductionofTIinformationinTIdatabooksordatasheetsispermissibleonlyifreproductioniswithoutalterationandisaccompaniedbyallassociatedwarranties,conditions,limitations,andnotices.Reproductionofthisinformationwithalterationisanunfairanddeceptivebusinesspractice.TIisnotresponsibleorliableforsuchaltereddocumentation.Informationofthirdpartiesmaybesubjecttoadditionalrestrictions. 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TIproductsarenotauthorizedforuseinsafety-criticalapplications(suchaslifesupport)whereafailureoftheTIproductwouldreasonablybeexpectedtocauseseverepersonalinjuryordeath,unlessofficersofthepartieshaveexecutedanagreementspecificallygoverningsuchuse.Buyersrepresentthattheyhaveallnecessaryexpertiseinthesafetyandregulatoryramificationsoftheirapplications,and acknowledgeandagreethattheyaresolelyresponsibleforalllegal,regulatoryandsafety-relatedrequirementsconcerningtheirproductsandanyuseofTIproductsinsuchsafety-criticalapplications,notwithstandinganyapplications-relatedinformationorsupportthatmaybeprovidedbyTI.Further,BuyersmustfullyindemnifyTIanditsrepresentativesagainstanydamagesarisingoutoftheuseofTIproductsinsuchsafety-criticalapplications. TIproductsareneitherdesignednorintendedforuseinmilitary/aerospaceapplicationsorenvironmentsunlesstheTIproductsarespecificallydesignatedbyTIasmilitary-gradeor\"enhancedplastic.\"OnlyproductsdesignatedbyTIasmilitary-grademeetmilitary specifications.BuyersacknowledgeandagreethatanysuchuseofTIproductswhichTIhasnotdesignatedasmilitary-gradeissolelyattheBuyer'srisk,andthattheyaresolelyresponsibleforcompliancewithalllegalandregulatoryrequirementsinconnectionwithsuchuse.TIproductsareneitherdesignednorintendedforuseinautomotiveapplicationsorenvironmentsunlessthespecificTIproductsaredesignatedbyTIascompliantwithISO/TS16949requirements.Buyersacknowledgeandagreethat,iftheyuseanynon-designatedproductsinautomotiveapplications,TIwillnotberesponsibleforanyfailuretomeetsuchrequirements. FollowingareURLswhereyoucanobtaininformationonotherTexasInstrumentsproductsandapplicationsolutions:ProductsAmplifiers DataConvertersDSP ClocksandTimersInterfaceLogic PowerMgmtMicrocontrollersRFID RF/IFandZigBee®Solutions amplifier.ti.comdataconverter.ti.comdsp.ti.comwww.ti.com/clocksinterface.ti.comlogic.ti.compower.ti.commicrocontroller.ti.comwww.ti-rfid.comwww.ti.com/lprfApplicationsAudio AutomotiveBroadbandDigitalControlMedicalMilitary OpticalNetworkingSecurityTelephony Video&ImagingWireless www.ti.com/audiowww.ti.com/automotivewww.ti.com/broadbandwww.ti.com/digitalcontrolwww.ti.com/medicalwww.ti.com/militarywww.ti.com/opticalnetworkwww.ti.com/securitywww.ti.com/telephonywww.ti.com/videowww.ti.com/wirelessMailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265 Copyright©2008,TexasInstrumentsIncorporated 因篇幅问题不能全部显示，请点此查看更多更全内容