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* 3.3VIN: this is external main power rail. Voltage range is 3.3V±5%
* PMIC_CELL: PMIC's coin cell supply input/output
* BOARD_PGOOD: this output signal is used to indicate when carrier board's circuitry interfacing Axel Lite's I/Os has to be powered up. '''N.B.''': Proper usage of this pin requires to connect it to an AND port together with the PMIC_PWRON signal, wiring the output of the port to the enable pin of the switch mounted on the carrier board. This interconnect is necessary because deasserting the PMIC_PWRON signal is not sufficient to properly reset all the PMIC power voltages.
For further details, please refer to the PMIC documentation.
