STMPE16M31PX datasheet(59/75 Pages) STMICROELECTRONICS

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STMPE16M31PX

Touchkey and proximity sensing controller

Doc ID 17058 Rev 2

59/75

Touchkey and proximity sensing controller

The touchkey controller processes raw capacitance measurement data into “touch/no-

touch” boolean data for easy usage. The key filter unit provides additional flexibility by

allowing the system to define a maximum number of keys that could be detected and

considered active, based on the amount of impedance change detected.

The proximity sensor using a technique called ‘dithering’ to increase the sensitivity of one

selected channel. Dithering factor (configurable from 4 - 32x) determines the sensitivity of

proximity sensor.

Table 15.

Touchkey controller registers

Address

Reset value

R/W

Description

0x90

KFU_PROX_CTRL

0x00

R/W

Key filter and proximity sensor

control

0x92 - 0x93

KEY_FILT_GROUP1

0x0000

R/W

Define channels included in key

filter group 1

0x96

PROX_CFG

0x00

R/W

Proximity configuration register

0x97

PTVR

0x00

R/W

Proximity variance register (PTVR)

0x98

PEVR

0x00

R/W

Proximity enviromental variance

0xB0

PROX_DATA_0

0x00

Proximity data port 0

0xB1

PROX_DATA_1

0x00

Proximity data port 1

0x9A - 0x9B

KEY_FILT_DATA

0x0000

Filtered touchkey data

0xB4-0xB5

TOUCH_DET

0x0000

Touch detection register

(real time)

Obsolete

Product(s)

- Obsolete

Product(s)

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