第1页 / 共14页
第2页 / 共14页
第3页 / 共14页
第4页 / 共14页
第5页 / 共14页
第6页 / 共14页
第7页 / 共14页
第8页 / 共14页
LM35的详细资料，工作原理与特性.pdf
LM35PrecisionCentigradeTemperatureSensorsGeneralDescriptionTheLM35seriesareprecisionintegrated-circuittemperaturesensors,whoseoutputvoltageislinearlyproportionaltotheCelsius(Centigrade)temperature.TheLM35thushasanadvantageoverlineartemperaturesensorscalibratedin˚Kelvin,astheuserisnotrequiredtosubtractalargecon-stantvoltagefromitsoutputtoobtainconvenientCentigradescaling.TheLM35doesnotrequireanyexternalcalibrationortrimmingtoprovidetypicalaccuraciesof±1⁄4˚Catroomtemperatureand±3⁄4˚Coverafull−55to+150˚Ctempera-turerange.Lowcostisassuredbytrimmingandcalibrationatthewaferlevel.TheLM35’slowoutputimpedance,linearoutput,andpreciseinherentcalibrationmakeinterfacingtoreadoutorcontrolcircuitryespeciallyeasy.Itcanbeusedwithsinglepowersupplies,orwithplusandminussupplies.Asitdrawsonly60µAfromitssupply,ithasverylowself-heating,lessthan0.1˚Cinstillair.TheLM35isratedtooperateovera−55˚to+150˚Ctemperaturerange,whiletheLM35Cisratedfora−40˚to+110˚Crange(−10˚withim-provedaccuracy).TheLM35seriesisavailablepackagedinhermeticTO-46transistorpackages,whiletheLM35C,LM35CA,andLM35DarealsoavailableintheplasticTO-92transistorpackage.TheLM35Disalsoavailableinan8-leadsurfacemountsmalloutlinepackageandaplasticTO-220package.FeaturesnCalibrateddirectlyin˚Celsius(Centigrade)nLinear+10.0mV/˚Cscalefactorn0.5˚Caccuracyguaranteeable(at+25˚C)nRatedforfull−55˚to+150˚CrangenSuitableforremoteapplicationsnLowcostduetowafer-leveltrimmingnOperatesfrom4to30voltsnLessthan60µAcurrentdrainnLowself-heating,0.08˚CinstillairnNonlinearityonly±1⁄4˚CtypicalnLowimpedanceoutput,0.1Wfor1mAloadTypicalApplicationsTRI-STATE®isaregisteredtrademarkofNationalSemiconductorCorporation.DS005516-3FIGURE1.BasicCentigradeTemperatureSensor(+2˚Cto+150˚C)DS005516-4ChooseR1=−VS/50µAVOUT=+1,500mVat+150˚C=+250mVat+25˚C=−550mVat−55˚CFIGURE2.Full-RangeCentigradeTemperatureSensorJuly1999LM35PrecisionCentigradeTemperatureSensors©1999NationalSemiconductorCorporationDS005516www.national.com
ConnectionDiagramsTO-46MetalCanPackage*DS005516-1*Caseisconnectedtonegativepin(GND)OrderNumberLM35H,LM35AH,LM35CH,LM35CAHorLM35DHSeeNSPackageNumberH03HTO-92PlasticPackageDS005516-2OrderNumberLM35CZ,LM35CAZorLM35DZSeeNSPackageNumberZ03ASO-8SmallOutlineMoldedPackageDS005516-21N.C.=NoConnectionTopViewOrderNumberLM35DMSeeNSPackageNumberM08ATO-220PlasticPackage*DS005516-24*Tabisconnectedtothenegativepin(GND).Note:TheLM35DTpinoutisdifferentthanthediscontinuedLM35DP.OrderNumberLM35DTSeeNSPackageNumberTA03Fwww.national.com2
AbsoluteMaximumRatings(Note10)IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.SupplyVoltage+35Vto−0.2VOutputVoltage+6Vto−1.0VOutputCurrent10mAStorageTemp.;TO-46Package,−60˚Cto+180˚CTO-92Package,−60˚Cto+150˚CSO-8Package,−65˚Cto+150˚CTO-220Package,−65˚Cto+150˚CLeadTemp.:TO-46Package,(Soldering,10seconds)300˚CTO-92andTO-220Package,(Soldering,10seconds)260˚CSOPackage(Note12)VaporPhase(60seconds)215˚CInfrared(15seconds)220˚CESDSusceptibility(Note11)2500VSpecifiedOperatingTemperatureRange:TMINtoTMAX(Note2)LM35,LM35A−55˚Cto+150˚CLM35C,LM35CA−40˚Cto+110˚CLM35D0˚Cto+100˚CElectricalCharacteristics(Notes1,6)LM35ALM35CAParameterConditionsTestedDesignTestedDesignUnitsTypicalLimitLimitTypicalLimitLimit(Max.)(Note4)(Note5)(Note4)(Note5)AccuracyTA=+25˚C±0.2±0.5±0.2±0.5˚C(Note7)TA=−10˚C±0.3±0.3±1.0˚CTA=TMAX±0.4±1.0±0.4±1.0˚CTA=TMIN±0.4±1.0±0.4±1.5˚CNonlinearityTMIN£TA£TMAX±0.18±0.35±0.15±0.3˚C(Note8)SensorGainTMIN£TA£TMAX+10.0+9.9,+10.0+9.9,mV/˚C(AverageSlope)+10.1+10.1LoadRegulationTA=+25˚C±0.4±1.0±0.4±1.0mV/mA(Note3)0£IL£1mATMIN£TA£TMAX±0.5±3.0±0.5±3.0mV/mALineRegulationTA=+25˚C±0.01±0.05±0.01±0.05mV/V(Note3)4V£VS£30V±0.02±0.1±0.02±0.1mV/VQuiescentCurrentVS=+5V,+25˚C56675667µA(Note9)VS=+5V10513191114µAVS=+30V,+25˚C56.26856.268µAVS=+30V105.513391.5116µAChangeof4V£VS£30V,+25˚C0.21.00.21.0µAQuiescentCurrent4V£VS£30V0.52.00.52.0µA(Note3)Temperature+0.39+0.5+0.39+0.5µA/˚CCoefficientofQuiescentCurrentMinimumTemperatureIncircuitof+1.5+2.0+1.5+2.0˚CforRatedAccuracyFigure1,IL=0LongTermStabilityTJ=TMAX,for±0.08±0.08˚C1000hourswww.national.com3
ElectricalCharacteristics(Notes1,6)LM35LM35C,LM35DParameterConditionsTestedDesignTestedDesignUnitsTypicalLimitLimitTypicalLimitLimit(Max.)(Note4)(Note5)(Note4)(Note5)Accuracy,TA=+25˚C±0.4±1.0±0.4±1.0˚CLM35,LM35CTA=−10˚C±0.5±0.5±1.5˚C(Note7)TA=TMAX±0.8±1.5±0.8±1.5˚CTA=TMIN±0.8±1.5±0.8±2.0˚CAccuracy,LM35D(Note7)TA=+25˚C±0.6±1.5˚CTA=TMAX±0.9±2.0˚CTA=TMIN±0.9±2.0˚CNonlinearityTMIN£TA£TMAX±0.3±0.5±0.2±0.5˚C(Note8)SensorGainTMIN£TA£TMAX+10.0+9.8,+10.0+9.8,mV/˚C(AverageSlope)+10.2+10.2LoadRegulationTA=+25˚C±0.4±2.0±0.4±2.0mV/mA(Note3)0£IL£1mATMIN£TA£TMAX±0.5±5.0±0.5±5.0mV/mALineRegulationTA=+25˚C±0.01±0.1±0.01±0.1mV/V(Note3)4V£VS£30V±0.02±0.2±0.02±0.2mV/VQuiescentCurrentVS=+5V,+25˚C56805680µA(Note9)VS=+5V10515891138µAVS=+30V,+25˚C56.28256.282µAVS=+30V105.516191.5141µAChangeof4V£VS£30V,+25˚C0.22.00.22.0µAQuiescentCurrent4V£VS£30V0.53.00.53.0µA(Note3)Temperature+0.39+0.7+0.39+0.7µA/˚CCoefficientofQuiescentCurrentMinimumTemperatureIncircuitof+1.5+2.0+1.5+2.0˚CforRatedAccuracyFigure1,IL=0LongTermStabilityTJ=TMAX,for±0.08±0.08˚C1000hoursNote1:Unlessotherwisenoted,thesespecificationsapply:−55˚C£TJ£+150˚CfortheLM35andLM35A;−40˚£TJ£+110˚CfortheLM35CandLM35CA;and0˚£TJ£+100˚CfortheLM35D.VS=+5VdcandILOAD=50µA,inthecircuitofFigure2.Thesespecificationsalsoapplyfrom+2˚CtoTMAXinthecircuitofFigure1.Specificationsinboldfaceapplyoverthefullratedtemperaturerange.Note2:ThermalresistanceoftheTO-46packageis400˚C/W,junctiontoambient,and24˚C/Wjunctiontocase.ThermalresistanceoftheTO-92packageis180˚C/Wjunctiontoambient.Thermalresistanceofthesmalloutlinemoldedpackageis220˚C/Wjunctiontoambient.ThermalresistanceoftheTO-220packageis90˚C/Wjunctiontoambient.ForadditionalthermalresistanceinformationseetableintheApplicationssection.Note3:Regulationismeasuredatconstantjunctiontemperature,usingpulsetestingwithalowdutycycle.Changesinoutputduetoheatingeffectscanbecom-putedbymultiplyingtheinternaldissipationbythethermalresistance.Note4:TestedLimitsareguaranteedand100%testedinproduction.Note5:DesignLimitsareguaranteed(butnot100%productiontested)overtheindicatedtemperatureandsupplyvoltageranges.Theselimitsarenotusedtocal-culateoutgoingqualitylevels.Note6:Specificationsinboldfaceapplyoverthefullratedtemperaturerange.Note7:Accuracyisdefinedastheerrorbetweentheoutputvoltageand10mv/˚Ctimesthedevice’scasetemperature,atspecifiedconditionsofvoltage,current,andtemperature(expressedin˚C).Note8:Nonlinearityisdefinedasthedeviationoftheoutput-voltage-versus-temperaturecurvefromthebest-fitstraightline,overthedevice’sratedtemperaturerange.Note9:QuiescentcurrentisdefinedinthecircuitofFigure1.Note10:AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevicemayoccur.DCandACelectricalspecificationsdonotapplywhenoperatingthedevicebeyonditsratedoperatingconditions.SeeNote1.Note11:Humanbodymodel,100pFdischargedthrougha1.5kWresistor.Note12:SeeAN-450“SurfaceMountingMethodsandTheirEffectonProductReliability”orthesectiontitled“SurfaceMount”foundinacurrentNationalSemicon-ductorLinearDataBookforothermethodsofsolderingsurfacemountdevices.www.national.com4
TypicalPerformanceCharacteristicsThermalResistanceJunctiontoAirDS005516-25ThermalTimeConstantDS005516-26ThermalResponseinStillAirDS005516-27ThermalResponseinStirredOilBathDS005516-28MinimumSupplyVoltagevs.TemperatureDS005516-29QuiescentCurrentvs.Temperature(InCircuitofFigure1.)DS005516-30QuiescentCurrentvs.Temperature(InCircuitofFigure2.)DS005516-31Accuracyvs.Temperature(Guaranteed)DS005516-32Accuracyvs.Temperature(Guaranteed)DS005516-33www.national.com5
TypicalPerformanceCharacteristics(Continued)ApplicationsTheLM35canbeappliedeasilyinthesamewayasotherintegrated-circuittemperaturesensors.Itcanbegluedorce-mentedtoasurfaceanditstemperaturewillbewithinabout0.01˚Cofthesurfacetemperature.Thispresumesthattheambientairtemperatureisalmostthesameasthesurfacetemperature;iftheairtemperatureweremuchhigherorlowerthanthesurfacetemperature,theac-tualtemperatureoftheLM35diewouldbeatanintermediatetemperaturebetweenthesurfacetemperatureandtheairtemperature.ThisisexpeciallytruefortheTO-92plasticpackage,wherethecopperleadsaretheprincipalthermalpathtocarryheatintothedevice,soitstemperaturemightbeclosertotheairtemperaturethantothesurfacetempera-ture.Tominimizethisproblem,besurethatthewiringtotheLM35,asitleavesthedevice,isheldatthesametempera-tureasthesurfaceofinterest.Theeasiestwaytodothisistocoverupthesewireswithabeadofepoxywhichwillin-surethattheleadsandwiresareallatthesametemperatureasthesurface,andthattheLM35die’stemperaturewillnotbeaffectedbytheairtemperature.TheTO-46metalpackagecanalsobesolderedtoametalsurfaceorpipewithoutdamage.Ofcourse,inthatcasetheV−terminalofthecircuitwillbegroundedtothatmetal.Alter-natively,theLM35canbemountedinsideasealed-endmetaltube,andcanthenbedippedintoabathorscrewedintoathreadedholeinatank.AswithanyIC,theLM35andaccompanyingwiringandcircuitsmustbekeptinsulatedanddry,toavoidleakageandcorrosion.Thisisespeciallytrueifthecircuitmayoperateatcoldtemperatureswhereconden-sationcanoccur.Printed-circuitcoatingsandvarnishessuchasHumisealandepoxypaintsordipsareoftenusedtoin-surethatmoisturecannotcorrodetheLM35oritsconnec-tions.Thesedevicesaresometimessolderedtoasmalllight-weightheatfin,todecreasethethermaltimeconstantandspeeduptheresponseinslowly-movingair.Ontheotherhand,asmallthermalmassmaybeaddedtothesen-sor,togivethesteadiestreadingdespitesmalldeviationsintheairtemperature.TemperatureRiseofLM35DueToSelf-heating(ThermalResistance,qJA)TO-46,TO-46*,TO-92,TO-92**,SO-8SO-8**TO-220noheatsinksmallheatfinnoheatsinksmallheatfinnoheatsinksmallheatfinnoheatsinkStillair400˚C/W100˚C/W180˚C/W140˚C/W220˚C/W110˚C/W90˚C/WMovingair100˚C/W40˚C/W90˚C/W70˚C/W105˚C/W90˚C/W26˚C/WStilloil100˚C/W40˚C/W90˚C/W70˚C/WStirredoil50˚C/W30˚C/W45˚C/W40˚C/W(Clampedtometal,Infiniteheatsink)(24˚C/W)(55˚C/W)*Wakefieldtype201,or1"discof0.020"sheetbrass,solderedtocase,orsimilar.**TO-92andSO-8packagesgluedandleadssolderedto1"squareof1/16"printedcircuitboardwith2oz.foilorsimilar.NoiseVoltageDS005516-34Start-UpResponseDS005516-35www.national.com6
TypicalApplicationsCAPACITIVELOADSLikemostmicropowercircuits,theLM35hasalimitedabilitytodriveheavycapacitiveloads.TheLM35byitselfisabletodrive50pfwithoutspecialprecautions.Ifheavierloadsareanticipated,itiseasytoisolateordecoupletheloadwitharesistor;seeFigure3.OryoucanimprovethetoleranceofcapacitancewithaseriesR-Cdamperfromoutputtoground;seeFigure4.WhentheLM35isappliedwitha200WloadresistorasshowninFigure5,Figure6orFigure8itisrelativelyimmunetowiringcapacitancebecausethecapacitanceformsaby-passfromgroundtoinput,notontheoutput.However,aswithanylinearcircuitconnectedtowiresinahostileenviron-ment,itsperformancecanbeaffectedadverselybyintenseelectromagneticsourcessuchasrelays,radiotransmitters,motorswitharcingbrushes,SCRtransients,etc,asitswiringcanactasareceivingantennaanditsinternaljunctionscanactasrectifiers.Forbestresultsinsuchcases,abypassca-pacitorfromVINtogroundandaseriesR-Cdampersuchas75Winserieswith0.2or1µFfromoutputtogroundareoftenuseful.TheseareshowninFigure13,Figure14,andFigure16.DS005516-19FIGURE3.LM35withDecouplingfromCapacitiveLoadDS005516-20FIGURE4.LM35withR-CDamperDS005516-5FIGURE5.Two-WireRemoteTemperatureSensor(GroundedSensor)DS005516-6FIGURE6.Two-WireRemoteTemperatureSensor(OutputReferredtoGround)DS005516-7FIGURE7.TemperatureSensor,SingleSupply,−55˚to+150˚CDS005516-8FIGURE8.Two-WireRemoteTemperatureSensor(OutputReferredtoGround)DS005516-9FIGURE9.4-To-20mACurrentSource(0˚Cto+100˚C)www.national.com7
TypicalApplications(Continued)DS005516-10FIGURE10.FahrenheitThermometerDS005516-11FIGURE11.CentigradeThermometer(AnalogMeter)DS005516-12FIGURE12.FahrenheitThermometerExpandedScaleThermometer(50˚to80˚Fahrenheit,forExampleShown)DS005516-13FIGURE13.TemperatureToDigitalConverter(SerialOutput)(+128˚CFullScale)DS005516-14FIGURE14.TemperatureToDigitalConverter(ParallelTRI-STATE™OutputsforStandardDataBustoµPInterface)(128˚CFullScale)www.national.com8
相关推荐
2023年江西萍乡中考道德与法治真题及答案.doc
2012年重庆南川中考生物真题及答案.doc
2013年江西师范大学地理学综合及文艺理论基础考研真题.doc
2020年四川甘孜小升初语文真题及答案I卷.doc
2020年注册岩土工程师专业基础考试真题及答案.doc
2023-2024学年福建省厦门市九年级上学期数学月考试题及答案.doc
2021-2022学年辽宁省沈阳市大东区九年级上学期语文期末试题及答案.doc
2022-2023学年北京东城区初三第一学期物理期末试卷及答案.doc
2018上半年江西教师资格初中地理学科知识与教学能力真题及答案.doc
2012年河北国家公务员申论考试真题及答案-省级.doc
2020-2021学年江苏省扬州市江都区邵樊片九年级上学期数学第一次质量检测试题及答案.doc
2022下半年黑龙江教师资格证中学综合素质真题及答案.doc
