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Oscillator Circuits For RTD Temperature Sensors

From Microchip Technology, Inc.
 

 
This application note shows how to design a temperature sensor oscillator circuit using Microchip's low-cost MCP6001 operational amplifier (op amp) and the MCP6541 comparator. Oscillator circuits can be used to provide an accurate temperature measurement with a Resistive Temperature Detector (RTD) sensor. Oscillators provide a frequency output that is proportional to temperature and are easily integrated into a microcontroller system. RC oscillators offer several advantages in precision sensing applications. Oscillators do not require an Analog-to-Digital Converter (ADC). The accuracy of the frequency measurement is directly related to the quality of the microcontroller's clock signal and high-frequency oscillators are available with accuracies of better than 10 ppm.
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Topics of Interest
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