* external interrupt capability (unavailable in analog mode)
A secondary GPIOs interface available on ETRA SoM is based on ADP5589 I/O expander. This expander is controlled by an internal I2C BUS.
==== Additional GPIO interface ====
ETRA SOM has an optional device, ADP5589 GPIO port, which supports the following standards and features:
* output states: push-pull or open drain + pull-up/down
* input states: floating, pull-up/down, IRQ
* keypad decoding for matrix up to 11 × 8
* key press/release interrupts
* dual programmable logic blocks
* PWM generator
* clock divider
* reset generators
Please refer to the ETRA SOM [[ETRA_SOM/Part_number_composition | part number composition]] for the related order code option.
===Pin mapping===