STMPE811_08 datasheet(30/54 Pages) STMICROELECTRONICS

Part #	STMPE811

Description	8-bit port expander with advanced touchscreen controller

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Touchscreen controller

STMPE811

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Window tracking

The -WDW_X and WDW_Y registers allow to pre-set a sub-window in the touchscreen such

that any touch position that is outside the sub-window will be discarded.

Figure 10.

Window tracking

FIFO

FIFO has a depth of 128 sectors. This is enough for 128 sets of touch data at maximum

resolution (2 x 12 bits). FIFO can be programmed to generate an interrupt when it is filled to

a pre-determined level.

Sampling

The STMPE811 touchscreen controller has an internal 100 kHz, 12-bit ADC able to execute

autonomous driving/sampling. Each "sample" consists of 4 ADC readings that provide the X

and Y locations, as well as the touch pressure.

Figure 11.

Sampling

Active window

Top right coordinates

Bottom left coordinates

ADC

takes X reading

Settling

period

Drive X

ADC

takes Y reading

Settling

period

Drive Y

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