Transcription of Techniques for Robust Touch Sensing Design
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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.
AN1334 DS00001334B-page 4 2010-2013 Microchip Technology Inc. NOISE BEHAVIOR: VOLTAGE-BASED ACQUISITION In voltage-based systems, injected noise can cause a
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