UM1045 datasheet(12/36 Pages) STMICROELECTRONICS

12 / 36 page

Block descriptions and configurations

EVALSPEAr320HMI

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Doc ID 18410 Rev 3

4.3.2

Connecting a touch screen

See also: STMPE811 touch screen connectors (CN600 & TS_CN600) on page 20

The expansion board provides two ways to use the SPEAr320 touch screen interface.

●

The first is based on the SPEAr320 internal Touch IP block, and can be used by means

of the TS_xxx block (in the schematics) and the TS_CN600 interface connector.

●

The second uses the standalone external touch screen controller, STMPE811 (U600).

STMPE811 is interfaced by means of the I2C bus and interrupt output pin.

The STMPE811 has:

–

A 4-wire touch screen controller (CN600)

–

A multiplexed general purpose input/output (GPIO) port expander, or an 8-input,

12-bit ADC (the default configuration).

–

Temperature sensor

The STMPE811 (U600) internal temperature sensor can be used for informative

temperature measurements, such as a reference for compensation of the touch

screen parameters.

Temperature measurement is optimized for temperatures from 0 to 85

oC.

–

User potentiometer

A 10 K

Ω potentiometer is available on the board, connected to the analog input

AIN0 of the STMPE811 (U600).

–

User buttons

The remaining pins of the STMPE811 (U600) touch screen controller are used to

service two user buttons (B600, B601) that are connected to the GPIO pins IO2

and IO3.

All temperature measurements, potentiometer voltage measurements, and button

status information is available by means of the I2C bus.

Any of these tracked parameters can trigger a preconfigured interrupt event that is

subsequently signaled to the SPEAr320 MPU by means of the STMPE811 Interrupt

line.

SB606, SB607:

Green LSB setting

Green LSB bit connected to the green MSB bit

SB606: open

SB607: closed

Intensity bit connected to the green LSB bit

SB606: closed

SB607: open

SB608, SB609:

Red LSB setting

Red LSB bit connected to the red MSB bit

SB608: open

SB609: closed

Intensity bit connected to the red LSB bit

SB608: closed

SB609: open

Table 4.

J601 configuration options (unified interface displays) (continued)

Jumper

Description

Configuration

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