The purpose of this application note is to provide the system/hardware engineers enough ground knowledge to start the design of capacitive touch inferface solutions with the S-Touch™ capacitive controller devices. The document highlights the recommended step-by-step procedures to be followed for a successful S-Touch™ design-in: design flow, PCB layout, fabrication, assembly pre- production and production tests. Each topic covered in this document is explained in detail in other application notes.
This document provides system and hardware engineers with the necessary knowledge to design capacitive touch interface solutions using S-Touch controller devices. It highlights recommended procedures for a successful design-in, covering the design flow, PCB layout, fabrication, assembly, and production tests.
The guide details the touch module design flow from specification to mass production testing. It also covers PCB layout guidelines to minimize noise and crosstalk, as well as hardware and software tuning procedures required for optimal device performance.
The objective is to bring the no-touch impedance of all unused sensor inputs within the dynamic range required for touch detection.
It is suggested to perform the software tuning with the panel overlay attached and the touch module assembled on the system.