单电源温度与热电偶传感

Thereisavarietyoftemperaturesensorsonthemarket

allofwhichmeetspecificapplicationneeds.Themost

commonsensorsusedtosolvetheseapplicationprob-

lemsincludethethermocouple,ResistiveTemperature

Detector(RTD),Thermistor,andsiliconbasedsensors.

Foranoverviewandcomparisonofthesesensors,

refertoMicrochip’s

AN679,“TemperatureSensing

Technologies”

.

Thisapplicationnotefocusesoncircuitsolutionsthat

usethermocouplesinthedesign.Thesignalcondition-

ingpathforthethermocouplesystemwillbediscussed

inthisapplicationnotefollowedbycompleteapplication

circuits.MAN684SingleSupplyTemperatureSensingwithThermocouplesbead.ThisbeadisexposedtothethermalenvironmentAuthor:BonnieC.Bakerofinterest.IfthereisatemperaturedifferencebetweenMicrochipTechnologyInc.thebeadandtheotherendofthethermocouplewires,avoltagewillappearbetweenthetwowiresattheendINTRODUCTIONwherethewiresarenotsoldere