Can unused module pins be left unconnected?

Unused signal pins may be left unconnected, since they have internal pull resistors.  The only exception to this is that the EN_1V8 pin of the modules, which needs to be connected to either dc_dc_cntl (standby enabled wiring) or to VIN_3V3 (always on wiring).  All power pins must be connected to power.  ADC and RTC pins may be left open.


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