AN4312 datasheet(1/36 Pages) STMICROELECTRONICS

Part #	AN4312

Description	Guidelines for designing touch sensing applications with surface sensors

PDF	36 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 36 page

September 2013

DocID024815 Rev 1

1/36

AN4312

Application note

Guidelines for designing touch sensing applications

with surface sensors

Introduction

This application note describes the layout and mechanical design guidelines used for touch

sensing applications with surface sensors.

Capacitive sensing interfaces provide many advantages compared to mechanical user

interfaces. They:

• offer a modern look and feel

• are easy to clean

• are waterproof

• are robust

Capacitive sensing interfaces are more and more used in a wide range of applications. The

interface is based on surface sensors that are made of small copper foils. The sensor acts

as a capacitor that is alternatively charged and discharged. The capacitor value depends on

the presence of the user finger as well as the sensor design. This application note

introduces various sensor designs and recommendations to achieve optimum

performances, keeping in mind that none of the sensor elements should 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

Table 1 lists the microcontrollers concerned by this application note.

Table 1. Applicable products

Type

Applicable products

Microcontrollers

STM32F0 series, STM32F3 series, STM32L1 series, STM8L series.

www.st.com

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