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AN897 - Thermistor Temperature Sensing

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Part number AN897
Manufacturer Microchip
File Size 383.39 KB
Description Thermistor Temperature Sensing
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AN897 Thermistor Temperature Sensing with MCP6SX2 PGAs Thermistor Resistance (:) Thermistor Error Magnitude (°C) Author: Kumen Blake and Steven Bible Microchip Technology Inc. INTRODUCTION This application note shows two designs that use a precise, negative temperature coefficient (NTC) thermistor for temperature measurement. The thermistor is placed in a resistive divider to linearize the temperature-to-voltage conversion. The voltage is processed in the analog domain by the MCP6SX2 (MCP6S22 or MCP6S92) Programmable Gain Amplifier (PGA) before conversion to the digital domain. The first design is simpler and has a smaller temperature range. The second design changes the PGA’s gain to achieve a greater temperature range.
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