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A guide on layout and placement of touch sensing ICs

Posted: 17 Aug 2011 ?? ?Print Version ?Bookmark and Share

Keywords:Touch sensing? touch screens? capacitive keypads?

Touch sensing solutions, like touch panels, touch screens, and capacitive keypads are becoming a substitute for mechanical buttons or membrane keyboards. They are used in a wide range of applications from consumer products like computers, appliances, and industrial equipment to portable devices as MP3 players or cellphones. They provide human interface for entering values or setting commands into the system. For example, the numbers "1" through "9", "#", and "*" on a common cellphone or a slider to adjust the radio volume up or down.

Migration from mechanical buttons or membrane keyboards to touch sensing solutions adds value to the applications in several ways. Touch sensing solutions do not involve mechanical parts, which eliminates chances of material wear out or corrosion due to air contact. The design can also be completely sealed from the external environment. Touch sensing solutions also reduce overall costs by simplifying mechanical designs and material cost.

This document presents a set of guidelines for layout and placement of touch sensing circuits using Freescale Semiconductors' capacitive touch sensing technology.

View the PDF document for more information.

Originally published by Freescale Semiconductors at as "Designing Touch Sensing Electrodes ".

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