Routing GPIO over unused DCC pin?

[sarain]

I'm working on a design with an nRF52810_CAAA WLCS package.  Routing the GPIO is pretty tight and I'm wondering whether it's safe to route a GPIO line across the unused DCC pin (A5).  I'm only using the LDO and not the DC/DC converter so the DCC pin is not otherwise connected to anything.

What is the electrical state of the DCC pin when the DC/DC converter is disabled?  If it's essentially floating, then I would presume that it's safe to route a GPIO signal over it.  Are there any conditions (besides setting the DCDCEN register) where it could interfere with a connected GPIO line?

To clarify, I see that someone asked the opposite question a while back, where they wanted to route the DCC connection over unused GPIO (https://devzone.nordicsemi.com/f/nordic-q-a/42983/nrf52-wlcsp-dcc-routing----ok-to-run-over-gpio-pins).  If I understood their question correctly, that answer doesn't help me since they were trying to use the DCC and had unused GPIO.

[run_ar]

Hi,

I am sorry this is taking a while. As far as I know routing a GPIO across the unused DCDC pin should be fine. Unfortunately I am waiting for confirmation to be sure.

[sarain]

Thanks for your response.  Based on this, I'll route it that way for now and look for confirmation before finalizing the design.

[run_ar]

This should be fine. There is a switch that disconnects DCC and puts it in High Impedance state when DCDC is disabled. Not sure if you intended to connect the pin, but if you do, this will have some capacitance, somewhere around ~10pF.

[sarain]

Thank you for tracking this down for me!  I really appreciate it!  This helped a lot with routing my design.  I read this as soon as you posted it but I'm just now getting around to responding.