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MPR121 proximity detection

Posted: 30 Mar 2010 ?? ?Print Version ?Bookmark and Share

Keywords:proximity detection? touch sensor controller? MPR121 sensor controller?

MPR121 is a feature-rich, second generation touch sensor controller after Freescale's initial release of the MPR03x series device. Like MPR03x, MPR121 has a unique feature that all the electrode inputs can be internally connected together so that all the surface touch sensing area on the inputs are "summed" together to act as a single large electrode pad. This can effectively increase the total area of the sensing conductor for non-contact near proximity detection for hand approaching.

Capacitive proximity detection uses the same principle as capacitive touch sensing. Each MPR121 input sensing channel can be used as contactless proximity detection as well as finger touch detection if each sensing pad is designed properly and relevant register are set properly.

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