STMPE16M31 datasheet(52/85 Pages) STMICROELECTRONICS

52 / 85 page

Touch sensor controller

STMPE16M31, STMPE24M31

52/85

Doc ID 16174 Rev 4

CAP_SEN_CTRL

Capacitive sensor control register

Address:

0x70

Type:

Reset:

0x00

Description:

This register controls the capacitive sensor’s operation.

543

210

CS_EN

HYS

ForcedAT

000

[7] CS_EN

Write ‘1’ to enable the capacitive sensor module

Write ‘0’ to disable the capacitive sensor module

This bit should be set after all other touch sensor setting have been written. The changes in

other setting when this bit is ‘1’ is not allowed.

If ratio-engine or key-filter unit is used, this bit should only be set, after ratio-engine and key-

filter unit has been configured.

[6:1] HYS

TVR Hysteresis

When there is no touch, the value of TVR is used as threshold to determine touch condition.

If touch is detected, the touch detection threshold is changed to TVR-(HYS*4), hence the

effective value of hysteresis is 0-256.

[0] ForcedAT

Write ‘1’ to initiate unconditional forced auto-tuning to center the static impedance value in the

dynamic range. Prior sending this command, the calibration model must be set to mode ‘10’

with auto-tuning enabled.

Read ‘1’ if the auto-tuning process in progress

Read ‘0’ if the auto-tuning process has been completed.

It is required that upon start up the system, this command is called once.

When the auto-tuning is executed in the presence of finger on the sensor, the ‘touch’ status will

become ‘no-touch’ after completion of the process. Once finger is removed, the auto-calibration

will take care of this situation allowing the detection of next ‘touch’ event.

Obsolete

Product(s)

- Obsolete

Product(s)

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