Unused I/O pins nRF52832

[Tim]

Hello,

Would appreciate current-day thinking regarding unused GPIO pins. Our product uses Laird's BL652, which embeds the nRF52832. Many GPIO pins are unused. I've looked at various past posts about this but most are at least a year old and some contradict each other. Consider:

https://devzone.nordicsemi.com/f/nordic-q-a/3345/unused-gpio-pins/12185#12185

https://devzone.nordicsemi.com/f/nordic-q-a/38886/unused-pins-and-esd/150499#150499

Should we connect unused GPIO pins to ground? Any pin configuration necessary? (Hardware is my weakness :-)

Many thanks,

Tim

[ketiljo]

Unused pins can be left floating, provided they are configured as disconnected (standard) or outputs. 

[Tim]

Thanks Ketiljo. To confirm, standard default configuration of IO pins is such that no configuration is necessary by our application. We have the following unused pins:

P0.02/AIN0
P0.04/AIN2
P0.05/AIN3
P0.06
P0.07
P0.08
P0.09/NFC1
P0.10/NFC2
P0.13
P0.17
P0.20
P0.22
P0.23
P0.24
P0.25
P0.26
P0.27
P0.28/AIN4
P0.29/AIN5
P0.30/AIN6
P0.31/AIN7

We will leave all of these pins floating.

Thanks for confirmation.

Tim

[ketiljo]

Yes, not problem. Just leave these floating and no need to configure these pins to anything.

[Tim]

Thank you, again.