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Thermistors in Single Supply Temperature Sensing Circuits

From Microchip Technology, Inc.

There is a variety of temperature sensors on the market all of which meet specific application needs. The most common sensors that are used to solve these application problems include the thermocouple, Resistive Temperature Detector (RTD) thermistor, and silicon-based sensors. This application note focuses on circuit solutions that use Negative Temperature Coefficient (NTC) thermistors in the design. The Thermistor has a non-linear resistance change-over temperature. The degree of this non-linearity will be discussed in the "Hardware Linearization Solutions" section of this application note. From this discussion, various linearization resistor networks will be shown with error analysis included. Finally, the signal conditioning path for the thermistor system will be covered with complete application circuits from sensor or microprocessor.
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