Digital interface levels are specified in the datasheet. Please look in the specification tables.
GPO run from a different supply, not VDD interface. The supply is VDDA_GPO and its maximum level is 3.3V.
Digital interface levels are specified in the datasheet. Please look in the specification tables.
GPO run from a different supply, not VDD interface. The supply is VDDA_GPO and its maximum level is 3.3V.