ST STM32F0 Series - Page 47

Contents
1 General information ...............................................................2
2 Terminology and principle .........................................................3
2.1 Terminology ...................................................................3
2.2 Principle ......................................................................3
3 Document reference ...............................................................5
4 STM32L4 touch sensing controller online presentation .............................6
5 Main characteristics ...............................................................7
5.1 Description ....................................................................7
5.2 Signal threshold................................................................7
5.3 Charge transfer ................................................................9
5.4 Sensitivity ....................................................................10
5.5 Sensor ......................................................................10
5.5.1 Key ..................................................................11
5.5.2 Linear or slider .........................................................12
5.5.3 Rotary or wheel.........................................................13
5.5.4 Active shield or driven shield...............................................14
5.6 Layout and PCB ..............................................................15
5.6.1 Led rules ..............................................................15
5.6.2 Electrode not located on PCB ..............................................16
5.6.3 Ground, shield and sensors ...............................................17
5.6.4 FAQ .................................................................20
5.7 Noise........................................................................21
5.7.1 Power supply ..........................................................21
5.7.2 False detection .........................................................21
5.7.3 Noise immunity .........................................................22
5.7.4 Conducted noise ........................................................22
6 Tuning............................................................................23
7 Getting started TSC with STM32CubeMX ..........................................24
7.1 Uses cases ..................................................................24
AN5105
Contents
AN5105 - Rev 1
page 47/52