Techniques for Robust Touch Sensing Design

2010-2013 microchip Technology 1AN1334 INTRODUCTIONThe purpose of this application note is to describe thebest Design practices when developing capacitivetouch applications for noisy environments. Thisapplication note will begin by defining the problemscaused by noise, and explain how that noise typicallyaffects systems. Hardware guidelines will then beprovided to help maximize the natural signal-to-noiseratio (SNR) of the application. Software Techniques arethen covered to describe some of the commonmethods used to filter a sensor s signal to increase theSNR further, and then to make a decoding decisionbased on the behavior of the capacitive hardware Design topics that will be covered and slider pad Design and material and layer trace layout and series Techniques for ESD supply grounding VDD and bypass capacitorsmTouch and RightTouch Sensing solution systemshave passed industry test standards in conducted andradiated susceptibility, and radiated emissions.

2010-2013 Microchip Technology Inc. DS00001334B-page 3 AN1334 The capacitive touch software process can be simplified into three distinct phases:

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  Design, Technique, Touch, Robust, Sensing, Microchip, Techniques for robust touch sensing design

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