Guru
Joined: 05/10/2019
Location: United KingdomPosts: 9128
| Posted: 08:16pm 28 Aug 2024 |
Got a Debug port on it now. :) A 1mm NSH though, not much room for anything else. I think this will probably be the end of the project.
The furthest holes on my breadboards are 1.1" apart and my headers are 0.8" apart. That gives a single row of holes on one side and two on the other for connecting bits. Ideally I'd have liked 0.7" apart but the DVI connector won't fit at that.
The PGA is going to overhang anyway as its outer pins are 1" apart and, unless the board is shaped, the holes are wasted anyway as when you plug it into the breadboard as this is at low level and you can't get to them.
The only way to get an SD card holder on is to either make the board even longer or change to a fully SMD USB connector and put it underneath. There may be problems getting that to work without the plug fouling the card. anyway, the only spare GPIO pins on the PGA would have to fight through a serious maze! I don't think there are enough routes left without seriously shrinking the track widths (I'm at 0.18mm now). I can't have more than four layers in this software.
Whether this is worth it when Pimorini's Pico 2 Plus board already has everything for only £3 more than the PGA2350 I don't know (except that I think this might have more IO pins). It's an interesting exercise though.