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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

ST STM32F0 Series Application Note

Other manuals for ST STM32F0 Series