PIC18F2550 / PIC18F25K50 board

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PIC18F2550 / PIC18F25K50 board

Post by octal » Thu Nov 10, 2016 12:37 am

I built and assembled a small prototyping board for PIC18F2550/PIC18F25K50. The PCB has been produced by SeeedStudio (excellent results), and I assembled first prototype by hand (quickly).
The board can be plugged directly on a breadboard, can be programmed using any PIC programmer via the 5 pin header.
Almost all pins are exposed, and I added two jumpers to make it possible to physically connect/disconnect two LEDs on PIC pins.
Another jumper provide the possibility to pull-down one pin in order to trigger the USB bootloader (if you prefer avoid an external programmer).

I didn't assembled the crystal on my board because I'm trying PIC18F25K50, and I want to check the possibility to do USB using internal crystal only.
I'll post the whole project, schematics and gerbers, and example souce codes (using Microchip C, Swordfish Basic) in few days.

Here some photos of the board
20161110_005152.jpg (156.98 KiB) Viewed 2613 times
20161110_004703.jpg (125.62 KiB) Viewed 2613 times
20161110_010125.jpg (225.92 KiB) Viewed 2613 times

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David Barker
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Re: PIC18F2550 / PIC18F25K50 board

Post by David Barker » Thu Nov 10, 2016 9:14 am

I look forward to seeing the code you come up with...

Jerry Messina
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Re: PIC18F2550 / PIC18F25K50 board

Post by Jerry Messina » Thu Nov 10, 2016 10:49 am

Nice little board octal.
I want to check the possibility to do USB using internal crystal only
I have the 45K50 running USB with SF using the internal osc. The chip has Active Clock Tuning (ACT) which is supposed to keep it to +/-0.2% over the full temperature range.

So far, it seems to work ok.

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