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RTD温度传感器的振荡器电路

上传者: 2022-10-21 22:58:55上传 PDF文件 418.37 KB 热度 11次

Thisapplicationnoteshowshowtodesigna

temperaturesensoroscillatorcircuitusingMicrochip’s

low-costMCP6001operationalamplifier(opamp)and

theMCP6541comparator.Oscillatorcircuitscanbe

usedtoprovideanaccuratetemperaturemeasurement

withaResistiveTemperatureDetector(RTD)sensor.

Oscillatorsprovideafrequencyoutputthatispropor-

tionaltotemperatureandareeasilyintegratedintoa

microcontrollersystem.

RCoscillatorsofferseveraladvantagesinprecision

sensingapplications.Oscillatorsdonotrequirean

Analog-to-DigitalConverter(ADC).Theaccuracyofthe

frequencymeasurementisdirectlyrelatedtothequality

ofthemicrocontroller’sclocksignalandhigh-frequency

oscillatorsareavailablewithaccuraciesofbetterthan

10ppm.AN895OscillatorCircuitsForRTDTemperatureSensorsAuthor:EzanaHaileandJimLepkowskiRTDsserveasthestandardforprecisiontemperatureMicrochipTechnologyInc.measurementsbecauseoftheirexcellentrepeatabilityandstabilitycharacteristics.ARTDcanbecharacter-izedoverit’stemperaturemeasurementrangetoINTRODUCTIONobtainatableofcoefficientsthatcanbeaddedtothe

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