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New Contributor
In general, it is recommended to connect unused WKx pins to GND.
However, it is possible to leave the unused WKx pins floating, as long as the internal pull-down resistors are enabled by SPI command.
If a WKx pins are unused and routed to the connector, it is recommended to keep the corresponding ESD capacitors populated on the board.
Important note:
If a WKx function is disabled and the device goes to Fail-Safe Mode, the WKx is automatically enabled as one of the wake-up sources. If an unused WKx input is left open without activated pull-down, this input can trigger a wake event, sending the device back to normal mode.
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