【通信应用笔记】触摸? PCB和布局指南.pdf AN2733 S-Touch PCB and layout guidelines Introduction The aim of this application note is to provide guidelines for the construction and the layout of different types of printed circuit boards (PCB) for the implementation of S-Touch capacitive devices: the FR4 and flexible PCBs or the ITO panel. Various substrate materials are available for different PCB design construction. Among the substrate materials currently available in the market, the FR4 is the most common. FR4 is a glass fiber epoxy laminate and the PCBs can have one or several layers. Given a limited size ……