stmpe16m31 STMicroelectronics, stmpe16m31 Datasheet - Page 52

• Manufacturer Part Number: stmpe16m31
• Description: S-touch? 16/24-channel Touchkey Controller With Pwm And Ratio Engines
• Manufacturer: STMicroelectronics

Touch sensor controller
CAP_SEN_CTRL
Address:
Type:
Reset:
Description:
52/85
CS_EN
RW
7
0
[6:1] HYS
[7] CS_EN
[0] ForcedAT
RW
6
0
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.
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.
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.
0x70
RW
0x00
This register controls the capacitive sensor’s operation.
RW
5
0
Doc ID 16174 Rev 3
RW
4
0
HYS
RW
3
0
Capacitive sensor control register
RW
2
0
STMPE16M31, STMPE24M31
RW
1
0
ForcedAT
RW
0
0