STM8T143 datasheet(2/65 Pages) STMICROELECTRONICS

Part #	STM8T143

Description	Single-channel capacitive sensor for touch and proximity detection

Download	65 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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2 / 65 page

Contents

STM8T143

2/65

DocID18315 Rev 6

Contents

1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3

Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4

STM8T ProxSense technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.1

Capacitive sensing overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

4.2

Charge-transfer acquisition principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

4.3

Internal sampling capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.4

Electrode parasitic capacitance compensation (EPCC) . . . . . . . . . . . . . . 13

5

STM8T143 processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.1

Automatic electrode tuning (AET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2

Signal calculation and reference calibration . . . . . . . . . . . . . . . . . . . . . . . 15

5.3

Detection and release thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.4

Dynamic calibration (DYCAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.5

Environment control system (ECS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.5.1

ECS principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.5.2

ECS halt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.5.3

Reference freeze and reference freeze timeout . . . . . . . . . . . . . . . . . . 23

5.5.4

ECS filter constant adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5.6

Debounce filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6

Device operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

6.1

Option byte description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

6.2

Device operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

6.2.1

Dual output mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

6.2.2

Control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

6.2.3

Data streaming mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

6.3

Output polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

6.4

Power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

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