nRF52 unused input signals

[Rulu]

According to several tickets regarding this topic it's recomended to keep unused pins unconnected on the PCB

and make sure that these pins have the reset value of NRF_GPIO->PIN_CNF[].

Does this mean that the external pin is disconnected from the inside and the internal signal is floating?

Or is there some kind of internal circuitry that connects the signal to GND?

The figures provided in the documentatin for the IO pin block diagram does not show this information (?)

To prevent floating inputs to oscillate (causing high current consumption) it's normal to connect signals to GND..

[ketiljo]

The pins will be left disconnected and will not draw any current since they are not defined as an input. So it's fine to leave them not connected. Only if you define them as an input, you must make sure they are not floating as usual.