LMx35, LMx35A Precision Temperature Sensors - …

1 ProductFolderSample &BuyTechnicalDocumentsTools &SoftwareSupport &CommunityLM135,LM135A,LM235,LM235A,LM33 5,LM335 ASNIS160E MAY1999 REVISEDFEBRUARY2015 LMx35, LMx35 APrecisionTemperatureSensors1 Features3 DescriptionTheLM135seriesare Precision ,easily-calibrated,1 DirectlyCalibratedto the 2-terminalzener,the LM135hasa breakdown 1 C InitialAccuracyAvailablevoltagedirectlyp roportionalto absolutetemperature Operatesfrom400 A to 5 mAat 10 mV/ K. Withless than1- dynamicimpedance,the deviceoperatesovera currentrangeof 400 A to Lessthan1- DynamicImpedance5 mA with virtuallyno changein EasilyCalibratedcalibratedat 25 C, the LM135has typicallyless than WideOperatingTemperatureRange1 C errorovera 100 C ,the LM135has a linearoutput. 200 C Overrange Low CostApplicationsfor the LM135includealmostany type oftemperaturesensingovera 55 C to 150 impedanceandlinear2 Applicationsoutputmakeinterfacingto readoutor controlcircuitry PowerSuppliesare especiallyeasy.

2 BatteryManagementTheLM135operatesovera 55 C to 150 C HVAC temperaturerangewhilethe LM235operatesovera Appliances 40 C to 125 C 40 C to 100 C. The LMx35devicesare availablepackagedin hermeticTO transistorpackageswhilethe LM335is also availablein (1)PARTNUMBERPACKAGEBODYSIZE(NOM)LM135TO -46(3) (3) (8) (1) For all availablepackages,see the orderableaddendumatthe end of the IMPORTANTNOTICEat the end of this datasheetaddressesavailability,warranty, changes,use in safety-criticalapplications,intellectual propertymattersand ,LM135A,LM235,LM235A,LM335,LM335 ASNIS160E MAY1999 Contents1 Applicationand Pin Configurationand Sensorat the End of a :LM135/LM235,LM135 Deviceand :LM335,LM335A(1).. Mechanical,Packaging,and RevisionHistoryNOTE:Pagenumbersfor previousrevisionsmay differfrompagenumbersin the (March2013)to RevisionEPage AddedPin Configurationand Functionssection,FeatureDescriptionsecti on,DeviceFunctionalModes,Applicationand Implementationsection,PowerSupplyRecomme ndationssection,Layoutsection,Deviceand DocumentationSupportsection,andMechanica l,Packaging,and (November2012)to RevisionDPage Changedlayoutof NationalDataSheetto TI 1999 2015,TexasInstrumentsIncorporatedProduct FolderLinks.

3 LM135LM135 ALM235LM235 ALM335LM335 ALM135,LM135A,LM235,LM235A,LM335, MAY1999 REVISEDFEBRUARY20155 Pin Configurationand FunctionsTO-46(NDV)TO-92(LP)3 Pins3 PinsBottomViewBottomViewSOIC(D)8 PinsTop ViewPin FunctionsPINI/ODESCRIPTIONNAMETO-46TO-92 SO8 2 No Connection 3 4 ONegativeoutputADJ 5 ICalibrationadjustpin No Connection 7+ 8 IPositiveinputCopyright 1999 2015,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback3 ProductFolderLinks:LM135LM135 ALM235LM235 ALM335LM335 ALM135,LM135A,LM235,LM235A,LM335,LM335 ASNIS160E MAY1999 (unlessotherwisenoted)(1)(2)(3)(4)MINMAX UNITR everseCurrent15mAForwardCurrent10mA8-Pin SOICP ackage 65150 CStoragetemperature,TstgTO / TO-92 Package 60150 C(1)StressesbeyondthoselistedunderAbsolu teMaximumRatingsmay causepermanentdamageto the stressratingsonly,whichdo not implyfunctionaloperationof the deviceat theseor any otherconditionsbeyondthoseindicatedunder RecommendedOperatingConditions.

4 Exposureto absolute-maximum-ratedconditionsfor extendedperiodsmay affectdevicereliability.(2)Referto RETS135 Hfor militaryspecifications.(3)If Military/Aerospacespecifieddevicesare required,pleasecontactthe TI SalesOffice/Distributorsfor availabilityand specifications.(4)Solderingprocessmustco mplywith the (unlessotherwisenoted)MINNOMMAXUNITC ontinuous(TMIN TA TMAX) 55150 CLM135,LM135 AIntermittent(1)150200 Continuous(TMIN TA TMAX) 40125 CSpecifiedTemperatureLM235,LM235 AIntermittent(1)125150 Continuous(TMIN TA TMAX) 40100 CLM335,LM335 AIntermittent(1) (1)Continuousoperationat thesetemperaturesfor 5,000hoursfor LP packagemay decreaselife expectancyof the (1)UNITSOIC(D)TO-92(LP)TO-46(NDV)8 PINS3 PINS3 PINSR JAJunction-to-ambientthermalresistance16 5202400 C/WR JCJunction-to-casethermalresistance 170 (1)For moreinformationabouttraditionaland new thermalmetrics,see theIC PackageThermalMetricsapplicationreport.

5 LM135/LM235,LM135A/LM235A(1)LM135A/LM235 ALM135/LM235 PARAMETERTESTCONDITIONSUNITMINTYPMAXMINT YPMAXO peratingOutputVoltageTC= 25 C, IR= 1 25 C, IR= 1 CUncalibratedTemperatureErrorTMIN TC TMAX, IR= CmATemperatureErrorwith 25 CTMIN TC TMAX, IR= CmACalibrationCalibratedErrorat ExtendedTC= TMAX(Intermittent)22 CTemperatureNon-LinearityIR= 1 C(1)Accuracymeasurementsare madein a well-stirredoil otherconditions,self heatingmustbe 1999 2015,TexasInstrumentsIncorporatedProduct FolderLinks:LM135LM135 ALM235LM235 ALM335LM335 ALM135,LM135A,LM235,LM235A,LM335, MAY1999 :LM335,LM335A(1)LM335 ALM335 PARAMETERTESTCONDITIONSUNITMINTYPMAXMINT YPMAXO peratingOutputVoltageTC= 25 C, IR= 1 25 C, IR= 1 mA1326 CUncalibratedTemperatureErrorTMIN TC TMAX, IR= 12549 CmATemperatureErrorwith 25 CTMIN TC TMAX, IR= CmACalibrationCalibratedErrorat ExtendedTC= TMAX(Intermittent)22 CTemperatureNon-LinearityIR= 1 C(1)Accuracymeasurementsare madein a well-stirredoil otherconditions,self heatingmustbe (1).

6 LM135/LM235/LM135A/LMLM335/LM335A235 APARAMETERTESTCONDITIONSUNITMINTYPMAXMIN TYPMAXO peratingOutputVoltageChange400 A IR 5 mA, CurrentConstantTemperatureDynamicImpedan ceIR= 1 OutputVoltageTemperature1010mV/ CCoefficientTimeConstantStill Air8080sec100 ft/MinAir1010secStirredOil11secTimeStabi lityTC= 125 C/khr(1)Accuracymeasurementsare madein a well-stirredoil otherconditions,self heatingmustbe 1999 2015,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback5 ProductFolderLinks:LM135LM135 ALM235LM235 ALM335LM335 ALM135,LM135A,LM235,LM235A,LM335,LM335 ASNIS160E MAY1999 ReverseVoltageChangeFigure2. CalibratedErrorFigure3. ReverseCharacteristicsFigure4. ResponseTimeFigure5. DynamicImpedanceFigure6. NoiseVoltage6 SubmitDocumentationFeedbackCopyright 1999 2015,TexasInstrumentsIncorporatedProduct FolderLinks:LM135LM135 ALM235LM235 ALM335LM335 ALM135,LM135A,LM235,LM235A,LM335, MAY1999 REVISEDFEBRUARY2015 TypicalCharacteristics(continued)Figure8 .

7 ThermalTimeConstantFigure7. ThermalResistanceJunctionTo AirFigure10. ThermalResponseIn StirredOil BathFigure9. ThermalResponseIn Still AirFigure11. ForwardCharacteristicsCopyright 1999 2015,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback7 ProductFolderLinks:LM135LM135 ALM235LM235 ALM335LM335 ALM135,LM135A,LM235,LM235A,LM335,LM335 ASNIS160E MAY1999 the LM135includealmostany typeof temperaturesensingovera 55 C to 150 C low impedanceand linearoutputmakeinterfacingto readoutor LM135operatesovera 55 C to 150 C temperaturerangewhilethe LM235operatesovera 40 C to125 C LM335operatesfrom 40 C to 100 a 2-terminalzener,the LM135hasa breakdownvoltagedirectlyproportionalto absolutetemperatureat 10 mV/ K. Withless than1- dynamicimpedance,the deviceoperatesovera currentrangeof400 A to 5 mA with virtuallyno changein 25 C, the LM135has typicallylessthan1 C errorovera 100 C ,the LM135has a the LM135chip is an easymethodof calibratingthe devicefor pot connectedacrossthe LM135withthe armtied to the adjustmentterminal(as shownin Figure12) allowsa 1-pointcalibrationof the sensorthat correctsfor inaccuracyoverthe full outputof the LM135is proportionalto absolutetemperaturewiththe extrapolatedoutputof sensorgoingto 0-V outputat 0 K ( C).

8 Errorsin outputvoltageversustemperatureare onlyslope(or scalefactor)errorsso a slopecalibrationat one temperaturecorrectsat outputof the device(calibratedor uncalibrated)can be expressedas:where8 SubmitDocumentationFeedbackCopyright 1999 2015,TexasInstrumentsIncorporatedProduct FolderLinks:LM135LM135 ALM235LM235 ALM335LM335 ALM135,LM135A,LM235,LM235A,LM335, MAY1999 REVISEDFEBRUARY2015 FeatureDescription(continued) T is the unknowntemperaturein degreesKelvin Tois a referencetemperaturein degreesKelvin(1)By calibratingthe outputto readcorrectlyat one temperaturethe outputat all temperaturesis outputis calibratedat 10 25 CFigure12. LM135has two functionalmodescalibratedand optimumaccuracy,a one pointcalibrationis moreinformationon calibration,seeTemperatureCalibrationUsi ngADJ 1999 2015,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback9 ProductFolderLinks.

9 LM135LM135 ALM235LM235 ALM335LM335 ALM135,LM135A,LM235,LM235A,LM335,LM335 ASNIS160E MAY1999 Applicationand ImplementationNOTEI nformationin the followingapplicationssectionsis not partof the TI componentspecification,and TI doesnot warrantits accuracyor s customersareresponsiblefor determiningsuitabilityof componentsfor test theirdesignimplementationto insuregoodsensingaccuracy,severalprecaut ionsmustbe any Temperature -sensingdevice,self-heatingca n LM135shouldbe operatedat the lowestcurrentsuitablefor the ,of course,mustbe availableto driveboththe sensorand the calibrationpot at the maximumoperatingtemperatureas well as any the sensoris usedin an ambientwherethe thermalresistanceis constant,self-heatingerrorscan be calibratedout. Thisis possibleif the deviceis run with a thenbe proportionaltozenervoltageand self-heatingerrorproportionalto absolutetemperaturethe sameas DesignParametersPARAMETEREXAMPLEVALUEA ccuracyat 25 C 1 CAccuracyfrom 55 C to 150 C CForwardCurrent1 mATemperatureSlope10 optimumaccuracy,R1 is pickedsuchthat 1 mA flowsthroughthe be introducedby varyingloadcurrentsor thesecurrentson the minimumandmaximumreversecurrentflowingth roughthe LM135shouldbe calculatedand be maintainedin the rangeof to 5 currentvariationthroughthe LM135will providefor the Currentspecificationcan be usedto calculatethe additionalerrorwhichcouldbe up to 1 K maximumfromthe LM135A,for 1999 2015,TexasInstrumentsIncorporatedProduct FolderLinks.

10 LM135LM135 ALM235LM235 ALM335LM335 ALM135,LM135A,LM235,LM235A,LM335, MAY1999 WideOperatingSupplyFigure16. MinimumTemperatureSensingWirelengthfor 1 C errordue to wire dropFigure17. AverageTemperatureSensingFigure18. IsolatedTemperatureSensorCopyright 1999 2015,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback11 ProductFolderLinks:LM135LM135 ALM235LM235 ALM335LM335 ALM135,LM135A,LM235,LM235A,LM335,LM335 ASNIS160E MAY1999 (continued)Figure19. SimpleTemperatureControllerFigure20. SimpleTemperatureControlAdjustR2 for outputof LM308 AdjustR1 for GroundReferredFahrenheitFigure22. CentigradeThermometerThermometerTo calibrateadjustR2 for for FahrenheitThermometer12 SubmitDocumentationFeedbackCopyright 1999 2015,TexasInstrumentsIncorporatedProduct FolderLinks:LM135LM135 ALM235LM235 ALM335LM335 ALM135,LM135A,LM235,LM235A,LM335, MAY1999 REVISEDFEBRUARY2015 SystemExamples(continued) GroundedThermocoupleSelectR3 for properthermocoupletypeFigure24.