Capacitive touch module registers STMPE321
32/40 Doc ID 15791 Rev 3
CALIBRATED_IMPEDANCE Calibrated impedance
Address: 0x70 - 0x72
Type: R
Reset: 0x00
Description: Calibrated impedance is a reference value maintained by the device.
IMPEDANCE Impedance
Address: 0x80 - 0x82
Type: R
Reset: 0x00
Description: Impedance is the instantaneous impedance value seen at the input pin of each
capacitive sensing pin.
TINT_PENDING Interrupt pending
Address: 0x92
Type: R
Reset: 0x00
Description: Reflects the status of each interrupt source.
76543210
CAL_IMPEDANCE
[7:0] CALIBRATED IMPEDANCE:
Calibrated reference impedance
76543210
IMPEDANCE
[7:0] IMPEDANCE:
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.
76543210
RESERVED EOC RESERVED
[7:4] RESERVED
[3] EOC:
End of calibration
[2:0] RESERVED
