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openstm32hw README
The aim is to provide Open Source hardware designs for STM32.
This repository grew from a discussion thread on LeafLabs Maple forum:
http://forums.leaflabs.com/topic.php?id=1303
It was initially triggered by ala42 who had released a first cut at libmaple for STM32F4:
http://forums.leaflabs.com/topic.php?id=1268&page=2#post-7828
and siy's hardware design:
http://forums.leaflabs.com/topic.php?id=1303&page=2&replies=46#post-7882
Subdirs:
MM4 - Leaf Labs Maple Mini clone for 64 pin F1/L1/F4 processors
in 0.8" width and 2 layers.
Mini64 - STM32 development board for OpenSTM32
Features:
- Small (52x38.4mm) breadboard compatible design.
- Support for STM32F103/F2xx/F4xx in 64-pin packages.
- Uses Eagle 5.1
Mini48 - Reworked version of Maple Mini suitable for DIY PCB production
and on-board RTC crystal. Uses Eagle 5.1
Mini48U - Ultimate version of Mini48. Still suitable for DIY PCB production
but smaller parts (0402) and optimized layout allowed make it in the
format of original Maple Mini with 0.6" pin header rows pitch.
Uses Eagle 5.1
Mini48SE - This version is very similar to Maple Mini, but it does not preserve
its pinout. It also heavily utilizes second side to achieve maximal possible density.
As a consequence this version is probably smallest STM32F103Cxx board - it has 0.5" pitch
and size only 50.5x15mm. At the same time board uses no extremely small components - all
resistors and capacitors are 0603 (one even 0805), LED - 1206, LDO - 1117.
Uses Eagle 6.3.0
The design is not yet tested.
Mini64SE - Different approach to boards based on MCU in LQFP64 package. It has DIP48 format with 0.8" pitch.
The design follows same approach as Mini48SE and utilizes both sides. Separate versions of design for
F1 and F2/F4 series are provided. Version for F2/F4 uses different ESD protection and lacks external
disconnect cirquitry. These changes are necessary to enable F2/F4 chips work properly in all supported
USB modes and with different powering (self powering and bus powering).
Uses Eagle 6.3.0
Designs are not yet tested.
PiXe-2: 'Stamp' format, 64pin STM32F103 MCU. Eagle 5.1
Features:
- Dual-in-line 0.1" grid
- 0805 or larger parts -> easier assembly
- Internal Maple pins available & re-configurable
- modest 10mil track/space rules DIY-able
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