Hi, We are using touch controller PN: TSC2046EIPWR in our automotive control panel project. But when applying high voltage ESD pulses(+/-8KV contact discharge) on the LCD metal back plate (touch panel is attached with this LCD), touch became non operative. I have not used any ESD suppression diodes on the touch lines(X+,X-,Y+,and Y-) since the datasheet says no external ESD diodes are required. Anybody has come across same behavior with TSC2046 ? Please see the touch controller schematic below...
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