STMPE321QTR datasheet(32/40 Pages) STMICROELECTRONICS

32 / 40 page

Capacitive touch module registers

STMPE321

32/40

Doc ID 15791 Rev 3

CALIBRATED_IMPEDANCE

Calibrated impedance

Address:

0x70 - 0x72

Type:

Reset:

0x00

Description:

Calibrated impedance is a reference value maintained by the device.

IMPEDANCE

Impedance

Address:

0x80 - 0x82

Type:

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:

Reset:

0x00

Description:

Reflects the status of each interrupt source.

654

3210

CAL_IMPEDANCE

[7:0] CALIBRATED IMPEDANCE:

Calibrated reference impedance

654

3210

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.

654

3210

RESERVED

EOC

RESERVED

[7:4] RESERVED

[3] EOC:

End of calibration

[2:0] RESERVED

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