Combining Self- & Mutual-Capacitive Sensing for Distinct User Advantages

By Shar Narasimhan – Capacitive touch systems are clearly superior to resistive touch systems. Resistive touch systems break down and wear out due to their moving parts. The majority of resistive touch systems also can’t effectively distinguish multi-touch interaction with a user.

After the iPhone popularized pinch and rotate gestures in 2005, system designers have used mutual capacitive sensing to determine multiple touch points and gestures.

The drawback of mutual capacitive sensing is that it takes longer to do the measurement and, hence, uses more power.

If you use a dual-architecture chip that can do both schemes, you can provide both lower power and good multi-touch accuracy. more>

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