STMPE321 ST Microelectronics, STMPE321 Datasheet - Page 32

• Manufacturer Part Number: STMPE321
• Description: 3-channel capacitive touch key controller
• Manufacturer: ST Microelectronics

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Capacitive touch module registers
CALIBRATED_IMPEDANCE
Address:
Type:
Reset:
Description:
IMPEDANCE
Address:
Type:
Reset:
Description:
TINT_PENDING
Address:
Type:
Reset:
Description:
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7
7
7
ss [7:4]
Number of cycles = repetition [3:0]
[7:0] CALIBRATED IMPEDANCE:
[7:0] IMPEDANCE:
[7:4] RESERVED
[2:0] RESERVED
[3] EOC:
6
6
6
0x70 - 0x72
R
0x00
Calibrated impedance is a reference value maintained by the device.
Calibrated reference impedance
0x80 - 0x82
R
0x00
Impedance is the instantaneous impedance value seen at the input pin of each
capacitive sensing pin.
Currently sensed impedance. This impedance reading decreases with the increase of the
capacitance at the sensing channel.
When this register reads 0x7F, reference capacitance should be reduced.
When this register reads 0x00, reference capacitance should be increased.
0x92
R/W
0x00
Reflects the status of each interrupt source.
End of calibration
RESERVED
5
5
5
Doc ID 15791 Rev 1
4
4
4
CAL_IMPEDANCE
IMPEDANCE
EOC
3
3
3
2
2
2
Calibrated impedance
RESERVED
Interrupt pending
1
1
1
Impedance
STMPE321
0
0
0