Switch branches/tags
Nothing to show
Find file History
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Permalink
..
Failed to load latest commit information.
README
mini48-v0.3-schematic.pdf
mini48-v0.3.brd
mini48-v0.3.sch

README

Mini48 is a STM32 development board for OpenSTM32 project (https://github.com/gbulmer/openstm32).
This design is significantly modified Maple Mini R2 with some changes in schematic (no separate
analog ground, added RTC crystal) and completely new PCB (single layer, 0.7" row header spacing).

Copyright (C) LeafLabs (sorry, don't know exact years) 
Changes Copyright (C) 2012 Sergiy Yevtushenko.

Just like original design, modified version is distributed under terms and conditions
of Creative Commons Attribution-ShareAlike license 
(see http://creativecommons.org/licenses/by-sa/3.0/legalcode for details).

Features:
- Small (51.4x21.2mm) breadboard compatible design.
- Compatible with Maple Mini, although ADC noise characteristics might be worse
- RTC crystal on board

The design files were created in Eagle 5.11. Pictures of board can be found at 
https://picasaweb.google.com/101499174242780444159/Mini48.

At present design is single sided and suitable for DIY PCB production, although the requirements
to the production process is quite high - board uses 0.15/0.15mm traces/spaces and designed with
presence of solder mask in mind. The design is optimized for dry film negative photoresist process. 
Design files as-is are ready to use for ordering boards at some PCB production service.
Although they can be used for DIY production too, it might be useful to do following changes 
in the design files before creating photomask:

- Increase width of the dimension rectangle to 0.2mm and include it into top layer and 
  solder mask photomasks.
- Change width of default net class tracks to 0.17mm.
- Change width of vcc net class tracks except GND polygon to 0.32mm. 
- Change width of GND polygon wire to 0.1mm

NOTE: After these changes board will not pass DRC! If you plan make further modifications in the 
PCB changed as described above, change DRC rules accordingly.

Comments and suggestions are welcome.

Regards,
    Sergiy Yevtushenko <Sergiy.Yevtushenko@gmail.com>