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STMPE821 bảng dữ liệu(PDF) 38 Page - STMicroelectronics

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STMPE821 bảng dữ liệu(HTML) 38 Page - STMicroelectronics

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Capacitive touch module registers
STMPE821
38/55
CALIBRATED_IMPEDANCE
Calibrated impedance
Address:
0x70 - 0x77
Type:
R
Reset:
0x00
Description:
Calibrated impedance is a reference value maintained by the device.
IMPEDANCE
Impedance
Address:
0x80 - 0x87
Type:
R
Reset:
0x00
Description:
Impedance is the instantaneous impedance value seen at the input pin of each cap.
sensing pin.
7
654
3210
CAL_IMPEDANCE
[7:0] CALIBRATED IMPEDANCE:
Calibrated reference impedance
7
654
3210
IMPEDANCE
[7:0] IMPEDANCE:
Currently sensed impedance. This impedance reading decreases with the increase of the
capacitance at sensing channel.
When this register reads 0x7F, reference capacitance should be reduced.
When this register reads 0x00, reference capacitance should be increased.



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