This application note describes the layout and mechanical design guidelines used for touch sensing applications. Capacitive sensing interfaces provide many advantages compared to mechanical user interfaces. They offer a modern look and feel, easy to clean, waterproof, and robust. Capacitive sensing interfaces are more and more used in a wide range of applications. The main difficulty designing such interfaces is to ensure that none of the items interfere with each other.
This document provides simple guidelines covering three main aspects:
1. Printed circuit board (PCB)
2. Overlay and panel materials
3. All other items in the capacitive sensor environment