STMPE812A datasheet(37/53 Pages) STMICROELECTRONICS

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STMPE812A

Touchscreen controller

Doc ID 18225 Rev 4

37/53

TSC sampling rate

TSC sampling rate register

Address:

0x43

Type:

R/W

Reset:

0x0A

Description:

Touchscreen controller sampling rate control register.

TSC_data

Touchscreen data register

Address:

0x42

Type:

R/W

Reset:

0xB0

Description:

The data format of the touchscreen controller data register depends on the setting of

“OpMode” field in the touchscreen detection configuration 2 register. The samples

acquired are accessed in “packed samples”. The size of each “packed sample”

depends on which mode the touchscreen controller is operating in.

Note:

In order to preserve the integrity of the data, it is mandatory to ensure the following:

- System host to read exactly the number of bytes according to the programmed operating

mode

- I2C host to insert a STOP condition after each data read command

Data pointer in this 1-level buffer could be reset by:

-User issued ACQ in user initiated acquisition mode. In mode ‘10’, every time sampling is

completed, it overwrites the buffer, and reset the data pointer

7654

SAMPLING

0000

[7:0] Sampling[7:0]

Sets the sampling rate of touchscreen controller.

Sampling Time = (sampling[7:0]+1) in ms

Clock cycle = 1 µs (1 MHz RC OSC)

Sampling time = 1 ms – 256 ms

NOTE:

This is used as “TSC regular initiator signal’. As long as there remains a valid touch, every

interval of this timing, the touchscreen controller executes a complete drive/settling/multi-

sample/MAV/data calculation. It is the user’s responsibility to choose a sampling time that is

enough, based on ADC_FREQ, settling time and filter.

7654

TSC_DATA_7

TSC_DATA_6

TSC_DATA_5

TSC_DATA_4

TSC_DATA_3

TSC_DATA_2

TSC_DATA_1

TSC_DATA_0

0000

[7:0] TSC_DATA_x: Data byte from touchscreen controller.

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