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What is the ESD tolerance of PSoC GPIO?
All PSoC and all Cypress parts are tested to 2kV human body model. In case of capsense, the PSoC has passed ESD tests upto 8kV with an insulator (0.2-0.256mm) over switch area. Greater ESD immunity can be accomplished with thicker overlays. Details of the overlays can be found here: Getting Started with Capsense