IC temperature sensor accuracy compensation with a PICmicro MCU

Microchip Technology Inc. provides a number of analog and serial-output IC temperature sensors. The typical accuracy of these sensors at room temperature is within ±1°C. However, at hot or cold temperature extremes, the accuracy decreases non-linearly. Typically, the non-linearity has a parabolic shape.

This application note derives an equation that describes the sensor's typical non-linear characteristics, which can be used to compensate for the sensor's accuracy error over the specified operating temperature range.

A PICmicro MCU can be used to compute the equation and provide higher-accuracy temperature reading. This application note is based on the analog output MCP9700/MCP9701 and serial output MCP9800 temperature sensors.

View the PDF document for more information.