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Using the PIC MCU CTMU for temperature measurement

Posted: 26 May 2009 ?? ?Print Version ?Bookmark and Share

Keywords:MCU? temperature measurement? CTMU?

The Charge Time Measurement Unit (CTMU), introduced on the latest generation of PIC24F and PIC18F devices, uses a constant current source to calculate both capacitance changes and the time difference between events. The same current source can also be used to measure temperature by exploiting a basic principle of semiconductor physics. This allows the use of a common and inexpensive diode, in the place of a relatively more expensive thermistor or other temperature sensor. This application note describes the basic concepts of temperature measurement using the CTMU.

View the PDF document for more information.

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