Well it's not an official Arduino Pro Mini. It's my own circuit that shares the same pin assignmens of the Arduino Pro Mini, runs at 3.3v and 8 mhz and has a bunch of other stuff on it. Schematic is attached at the bottom.
The eagle files and code are located here and here:
Pin A5 is connected to the P-Channel Mosfet located right around the middle of the schematic, labeled U$4 (because I was too lazy to change the Eagle assigned label). It is there to cut power to the OLED, SD card, and GPS to save on power when the micro controller is asleep. The GPS's backup is kept connected to V+ to maintain its memory. I noticed when testing it out that the display was not turning off when the micro controller would go to sleep. It would however dim slightly. That's when I started looking at the voltage at the gate of the mosfet using the blink sketch. What I saw was that the gate voltage was staying at +3.3v and not alternating between 3.3 and ground. There is continuity between the mcu pin and the gate so I assume that whatever is happening at the gate is happening at the pin as well. My voltmeter probes aren't small enough to check the actual pin voltage without bumping in to the pins next to it.
