SushiBits One

ARM Cortex-M in Arduino form factor, and consumes very little power.

Introduction & Goal

This is one of my "design challenges" to myself:

• Arduino-compatible form factor,
• Take an 48-pin STM32 microcontroller (since STM32F103CBT6 are that cheap,)
• Bring all I/O pins out somewhere, be it the connectors, JTAG or USB,
• No two pins can be shorted together,
• Use only switch-mode power supply,
• Two layer PCB only,
• Single side load.

Main components

• STM32 microcontroller in LQFP-48 package. I have tested the following:
  • STM32F072C8T6 (Cortex-M0 @48MHz)
  • STM32F103CBT6 (Cortex-M3 @72MHz)
  • STM32L151CCT6 (Cortex-M3 @32MHz, ULP)
  • STM32F303CCT6 (Cortex-M4F @72MHz)
  • STM32F373CCT6 (Cortex-M4F @72MHz)
• WCH CH340B: USB to UART adapter.
• TI TPS562200: VIN to 5V buck converter.
• TI LM3671-3.3: 5V to 3.3V buck converter.

License

This is open source hardware, licensed under the 3-clause BSD license.