AN3245

Hardware

Doc ID 17747 Rev 1

7/19

1.3.1

Push-pull

Set the GPIO to output state through the GPIO_SET_DIR (0x19 - 0x1B) register. Input path

is disabled. Output path is enabled in push-pull configuration.

Figure 5.

GPIO push-pull configuration

1.3.2

Open drain

GPIO output driven low by STMPE1801

Set the GPIO to output state through the GPIO_SET_DIR (0x19 - 0x1B) register. Input path

is disabled. Set the output state to low through the GPIO_CLR (0x13 - 0x15) register. Output

path is enabled and GPIO pin pulled low.

Figure 6.

GPIO open drain configuration (output low)

GPIO output pulled high by external pull-up resistor

Set the GPIO to input state through the GPIO_SET_DIR (0x19 - 0x1B) register. Input path is

enabled and output path disabled. GPIO is pulled high by external pull-up resistor.