Small breakout board designed for the SAM D20 and SAM D21 ARM Cortex-M0+ microcontrollers from Microchip

• minimal subset of components, no power regulation etc.
• optional external main and real-time crystals - if not used, their GPIO pins can be connected to the user header by soldering relevant 0R resistors (see schematic)
• one buffered user LED, connected to the header - no reserved GPIO
• reset button
• standard 0.05" pitch SWD programming header, SWD signals also present on the pin headers

Designed in KiCad 5.1.6

Schematic: PDF

License: CC BY-SA 4.0