Routing GPIO over unused DCC pin?

RE: Routing GPIO over unused DCC pin?

sarain — Wed, 17 Jun 2020 22:16:24 GMT

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.

RE: Routing GPIO over unused DCC pin?

run_ar — Fri, 20 Mar 2020 16:11:32 GMT

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.

RE: Routing GPIO over unused DCC pin?

sarain — Tue, 17 Mar 2020 19:16:16 GMT

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

RE: Routing GPIO over unused DCC pin?

run_ar — Tue, 17 Mar 2020 15:27:18 GMT

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.