STM8T143 STMicroelectronics, STM8T143 Datasheet - Page 6

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STM8T143

Manufacturer Part Number
STM8T143
Description
Single-channel capacitive sensor for touch and proximity detection
Manufacturer
STMicroelectronics
Datasheet

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List of figures
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STM8T143 block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SO8 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
UFDFPN8 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Coupling with hand increases the capacitance of the sensing electrode . . . . . . . . . . . . . . 12
STM8T143 measuring circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Signal monitored on C
Automatic electrode tuning (AET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Signal reference and detection threshold (not detailed) . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DYCAL general operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
DYCAL operation with water residue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
No DYCAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
IIR filter formula . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
ECS halt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Unwanted detection managed by the reference freeze timeout . . . . . . . . . . . . . . . . . . . . . 24
ECS filter K constant management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Data streaming frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Typical application schematic for Control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Typical application schematic for Dual output mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Typical application schematic for Data streaming mode. . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Pin loading conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Data streaming timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
SO8-lead plastic small outline - package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
SO8 narrow recommended footprint (dimensions in mm) . . . . . . . . . . . . . . . . . . . . . . . . . 49
UFDFPN8-lead ultra thin fine pitch dual flat package (MLP) package outline . . . . . . . . . . 50
UFDFPN 2 x 3 mm recommended footprint (dimensions in mm) . . . . . . . . . . . . . . . . . . . . 51
STM8T143 ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
SO8 package marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
UFDFPN8 package marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
STM8T142 programming tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
X
pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Doc ID 18315 Rev 3
STM8T143

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