The PSoC 4 CapSense Design Guide shows how to design capacitive touch sensing applications with the PSoC 4 family of devices. The CapSense feature in PSoC 4 offers unprecedented signal to noise ratio, best in class waterproofing, and a wide variety of sensors such as buttons, sliders, track pads and proximity sensors. This guide explains PSoC 4 CapSense operation, CapSense design tools, the PSoC Creator Component, performance tuning, and design considerations.