A Simple Thermistor Interface to an ADC

Abstract:Thisarticledescribesasimpleandcosteffectivemethodofmeasuringtemperatureusingathermistorconnectedinahalf-bridgeconfiguration.ThegoalistoperformaratiometricmeasurementsuchthattheVREFsourcevoltagetothedivideristhesameasthereferencetotheanalog-to-digitalconverter(ADC)usedtomeasurethevoltageatVT.Maxim>AppNotes>A/DandD/ACONVERSION/SAMPLINGCIRCUITSKeywords:halfbridge,thermistor,ADC,A/Dconverter,NTC,PTC,ratiometric,negativetemperatureSep27,2002coefficent,positiontemperaturecoefficent,analogtodigitalconvertersAPPLICATIONNOTE1753ASimpleThermistorInterfacetoanADCAbstract:Thisarticledescribesasimpleandcosteffectivemethodofmeasuringtemperatureusingathermistorconnectedinahalf-bridgeconfiguration.ThegoalistoperformaratiometricmeasurementsuchthattheVREFsourcevoltagetothedivideristhesameasthereferencetotheanalog-to-digitalconverter(ADC)usedtomeasurethevoltageatVT.Therearemanycircuitsandmeasurementmethodsthatcanbeusedwithathermistortodeterminethetemperature.Thesimplesta