What happens when GPIO is sourcing more mA than allowed?

[Lars Beiderbecke]

My STM32F746 can source 25 mA per pin, but only 120 mA in total.

What happens if we exceed that amount? Will there be a brown out, will the STM32 reset, or will the STM32 get damaged?

[waclawek.jan]

You can consider also serially interfaced IO ports ("expanders"), e.g. MCP23S17

JW