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Water-resistant capacitive sensing

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

Keywords:capacitive sensing? water-resistant capacitive? touch sensing area?

This application note describes a new hardware sensing method that is resilient to water drops appearing on the surface of the touch sensing area. In other touch systems, a drop of water will act in the same manner as if a user touches the system. This makes it difficult to determine a real press from a user or a false press from a drop of water. This new method, called Capacitive Transient Coupling (CTC), will clearly distinguish a drop of water from a finger touch.

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