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IC temperature sensor accuracy compensation with a PICmicro MCU

Posted: 27 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:temperature sensor? MCU? PICmicro?

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 1C. 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.

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