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Microchip CTMU for capacitive touch applications

Posted: 10 Feb 2009 ?? ?Print Version ?Bookmark and Share

Keywords:capacitive touch application? application note? charge time unit measurement? touch sense?

This application note describes the use of Microchip's Charge Time Measurement Unit (CTMU) for capacitive touch applications. The CTMU is an excellent peripheral for use in touch sensing applications. The following are some of the benefits of using the CTMU for touch sensing applications:

? Easy hardware setup
? Simple to use software algorithms, available free of charge
? High speed allows for greater scan rate of capacitive touch switches and for many other processor tasks
? Low cost and low component count; no external hardware other than a connection to the copper sensor pad.

The purpose of this application note is to inform prospective users of the CTMU for capacitive touch on general usage guidelines, CTMU setup and software algorithms, hardware and layout considerations, and advanced capacitive touch applications, such as matrix keys, sliders and multiple press keys.

View the PDF document for more information.

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