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Principles of capacitive touch and proximity sensing technology

Posted: 25 Mar 2010 ?? ?Print Version ?Bookmark and Share

Keywords:capacitive sensors? proximity sensing? sensing technology?

This application note aims to present the principles of capacitive sensing and charge transfer used in STMicroelectronics STM8T and STM8TS capacitive sensors. All devices can be configured in touch or proximity sensing.

A capacitance exists between any reference point relative to ground as long as they are electrically isolated. If this reference point is a sensing electrode, it helps to think of it as a capacitor. The positive electrode of the capacitor is the sensing electrode, and the negative electrode is formed by the surrounding area.

View the PDF document for more information.

Click here to view related datasheets.

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