STMPE811_09 Datasheet, PDF (34/64 Pages) STMicroelectronics – Advanced resistive touch screen controller with 8-bit GPIO expander

Touch screen controller
STMPE811
Oversampling and averaging function
The STMPE811 touch screen controller can be configured to oversample by 2/4/8 times and
provide the averaged value as final output. This feature helps to reduce the effect of
surrounding noise.
Table 15. Touch screen controller register summary table
Address Register name Bit Type
Function
0x40
TSC_CTRL
8
R/W 4-wire touch screen controller setup
0x41
TSC_CFG
8
R/W TSC configuration register
0x42
WDW_TR_X
16
R/W Window setup for top right X
0x44
0x46
WDW_TR_Y
WDW_TR_X
16
R/W Window setup for top right Y
16
R/W Window setup for bottom left X
0x48
WDW_TR_Y
16
R/W Window setup for bottom left Y
0x4A
FIFO_TH
8
R/W FIFO level to generate interrupt
0x4B
FIFO_STA
8
R/W Current status of FIFO
0x4C
0x4D
FIFO_SIZE
TSC_DATA_X
8
R Current filled level of FIFO
16
R Data port for TSC data access
0x4F
TSC_DATA_Y
16
R Data port for TSC data access
0x51
TSC_DATA_Z
8
R Data port for TSC data access
0x52
0x56
TSC_DATA_XYZ
32
R Data port for TSC data access
TSC_FRACT_Z
8
R/W Touch screen controller FRACTION_Z
0x57
TSC_DATA
8
R Touch screen controller data access port
0x58
TSC_I_DRIVE
8
R/W Touch screen controller drive I
0x59
TSC_SHIELD
8
R/W Touch screen controller shield
34/64
Doc ID 14489 Rev 2