STMPE811_08 datasheet(2/54 Pages) STMICROELECTRONICS

Part #	STMPE811

Description	8-bit port expander with advanced touchscreen controller

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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2 / 54 page

Contents

STMPE811

2/54

Contents

1

STMPE811 functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2

Pin configuration and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1

Pin functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3

I2C and SPI interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1

Interface selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4

I2C interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.1

I2C features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2

Data input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.3

Read operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.4

Write operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

5

SPI interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.1

SPI protocol definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.1.1

Register read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.1.2

Register write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1.3

Termination of data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2

SPI timing modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2.1

SPI timing definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6

STMPE811 registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7

System and identification registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8

Interrupt system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

9

Analog-to-digital converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

10

Touchscreen controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

10.1

Driver and switch control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

11

Touchscreen controller programming sequence . . . . . . . . . . . . . . . . . 41

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