Transcription of Capacitive Touch Using Only an ADC (CVD) App. Note
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Capacitive Touch Using Only an ADC (CVD) App. Note
AN1298. Capacitive Touch Using only an ADC ( CVD ). Sensing Steps Authors: Thomas Perme Dieter Peter To perform the sensing, do the following: Microchip Technology Inc. 1. Drive secondary channel to VDD as digital output. INTRODUCTION 2. Point ADC to the secondary VDD pin (charges CHOLD to VDD). This application note describes a new hardware 3. Ground sensor line. sensing method called Capacitive Voltage Divider 4. Turn sensor line as input (TRISx = 1). (CVD) which uses no external components. It requires 5. Point ADC to sensor channel (voltage divider only the ADC to perform Capacitive Touch sensing.)
AN1298 DS01298A-page 2 © 2009 Microchip Technology Inc. FIGURE 2: CVD BLOCK DIAGRAM (STEP 5) Detecting a Touch A touch will cause the ADC reading to decrease.
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