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STMPE1208S bảng dữ liệu(PDF) 14 Page - STMicroelectronics

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STMPE1208S bảng dữ liệu(HTML) 14 Page - STMicroelectronics

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Capacitive sensors
STMPE1208S
14/51
5
Capacitive sensors
The STMPE1208S capacitive sensor is based on fully digital, impedance change detection
engine that is capable of detecting very small change in capacitance.
Figure 8.
Capacitive sensors
5.1
Capacitive sensing
The STMPE1208S senses a human touch by the additional capacitance introduced to the
pad (with respect to ground). This capacitance causes a delay in a clock signal on the
sensing pad, and the delay in the sensing pad is compared with a reference clock and the
difference is a direct representation of the additional capacitance introduced by the
proximity/touch of finger.
Figure 9.
Capacitive sensing
Automatic calibration
Unit
Calibration control
parameters
Data filtering
Data filtering control
Parameters
7-bit impedance value
of each channel
Touchkey
Impedance sensor
Calibrated
impedance
Touched
keys



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