A3981KLPTR-T;中文规格书-Datasheet资料

DescriptionTheA3981isaflexiblemicrosteppingmotordriverwithbuilt-intranslatorforeasyoperation.Itisasingle-chipsolution,designedtooperatebipolarsteppermotorsinfull-,half-,quarter-andsixteenth-stepmodes,atupto28Vand±1.4A.TheA3981canbecontrolledbysimpleStepandDirectioninputs,orthroughtheSPI-compatibleserialinterfacethatalsocanbeusedtoprogrammanyoftheintegratedfeaturesandtoreaddiagnosticinformation.Thecurrentregulatorcanbeprogrammedtooperateinfixedoff-timeorfixedfrequencyPWM,withseveraldecaymodestoreduceaudiblemotornoiseandincreasestepaccuracy.Inadditionthephasecurrenttablescanbeprogrammedviatheserialinterfacetocreateuniquemicrostepcurrentprofilestofurtherimprovemotorperformanceforspecificapplications.ThecurrentineachphaseofthemotoriscontrolledthroughaDMOSfullbridge,usingsynchronousrectificationtoimprovepowerdissipation.Internalcircuitsandtimerspreventcross-conductionandshoot-through,whenswitchingbetweenhigh-sideandlow-sidedrives.Theoutputsareprotectedfromshortcircuits,andfeaturesforlowloadcurrentandstalledrotordetectionareincluded.Chip-levelprotectionincludes:hotandcoldthermalwarnings,overtemperatureshutdown,andovervoltageandundervoltagelockout.TheA3981issuppliedina28-pinTSSOPpowerpackagewithanexposedthermalpad(packagetypeLP).Thispackageislead(Pb)freewith100%matte-tinleadframeplating.A3981-DS,Rev.4FeaturesandBenefits•Peakmotorcurrentupto±1.4A,28V•LowRDS(on)outputs,0.5Ωsourceandsink,typical•Automaticcurrentdecaymodedetection/selection•Mixed,Fast,andSlowcurrentdecaymodes•Synchronousrectificationforlowpowerdissipation•InternalOVLO,UVLO,andThermalShutdowncircuitry•Crossover-currentprotection•Shortcircuitandopenloaddiagnostics•Hotandcoldthermalwarning•Stalldetectfeatures•SPI-compatibleorsimpleStepandDirectionmotioncontrol•HighlyconfigurableviaSPI-compatibleserialinterfaceApplications•Automotivesteppermotors•Enginemanagement•HeadlamppositioningAutomotive,ProgrammableStepperDriverPackage:28-pinTSSOPwithexposedthermalpad(suffixLP)TypicalApplicationsNottoscaleA3981Automotive12VPowerNetLogicSupplySerialInterfaceControlMicro-controllerorECUOAPPGNDVBBOSCOAMOBPOBMStepperMotorAGNDVCPSTEPDIRMS0MS1ENABLERESETnSDISDOSCKSTRnVDDDIAGSENSASENSBREFVREGCP1CP2ParallelControlAutomotive12VPowerNetLogicSupplyorECUOAPPGNDVBBOSCOAMOBPOBMStepperMotorAGNDVCPSTEPDIRMS0MS1ENABLERESETnSDISDOSCKSTRnVDDDIAGSENSASENSBREFVREGCP1CP2Micro-controller*A3981KLP-T50piecespertube4.4mm×9.7mm,1.2mmnominalheightTSSOPwithexposedthermalpadA3981KLPTR-T4000piecesperreel*ContactAllegro®foradditionalpackinginformation.AbsoluteMaximumRatingsWithrespecttoGNDCharacteristicSymbolNotesRatingUnitLoadSupplyVoltageVBBxAppliestoVBBAandVBBB–0.3to50VLogicSupplyVoltageVDD–0.3to6VPinCP1–0.3toVBBVPinsCP2,VCP–0.3toVBB+8VPinsSTEP,DIR,ENABLE,DIAG–0.3to6VPinVREG–0.3to8.5VPinRESETnCanbepulledtoVBBwith38kΩ–0.3to6VPinOSC–0.3to6VPinsMS0,MS1–0.3to6VPinsSDI,SDO,SCK,STRn–0.3to6VPinREF–0.3to6VPinsOAP,OAM,OBP,OBM–0.3toVBBVPinsSENSA,SENSB–0.3to1VAmbientOperatingTemperatureRangeTARangeK;limitedbypowerdissipation–40to150°CMaximumContinuousJunctionTemperatureTJ(max)150°CTransientJunctionTemperatureTtJOvertemperatureeventnotexceeding10s,lifetimedurationnotexceeding10hours,guaranteedbydesignandcharacterization175°CStorageTemperatureRangeTstg–55to150°CThermalCharacteristicsmayrequirederatingatmaximumconditionsCharacteristicSymbolTestConditions*ValueUnitPackageThermalResistance(JunctiontoAmbient)RθJA4-layerPCBbasedonJEDECstandard28ºC/W2-layerPCBwith24.52cm2ofcopperareaeachside32ºC/WPackageThermalResistance(JunctiontoPad)RθJP2ºC/W*AdditionalthermalinformationavailableontheAllegrowebsite://oneic.com/ELECTRICALCHARACTERISTICS1,2ValidatTJ=–40°Cto150°C,VBB=7to28V,VDD=3to5.5V;unlessotherwisenotedCharacteristicsSymbolTestConditionsMin.Typ.Max.UnitAutomotive,ProgrammableStepperDriverA39814AllegroMicroSystems,Inc.115NortheastCutoffWorcester,Massachusetts01615-0036U.S.A.1.508.853.5000;–50VOutputsDriving7–VBBOVVLoadSupplyQuiescentCurrentIBBQENABLE=0––4mASleepmode–110μALogicSupplyVoltageRangeVDD3–5.5VLogicSupplyQuiescentCurrentIDDQENABLE=0––5mAENABLE=0,VDD5V––5.5mASleepmode,VDD=3.3V–415μASleepmode,VDD=5V––25μAChargePumpVoltageVCPWithrepecttoVBB,