stm32-usbd-devboards

Development boards designed for USB-related projects based on STM32F0 and STM32G4 microcontroller series.

Why?

There are plenty of STM32 Nucleo boards available on the market, at very reasonable prices. The Nucleo-32 boards only have one USB connector, which is used by the built-in STLINK programmer. They don’t have any USB infrastructure for the main microcontroller’s USB FS device peripheral. These boards address this issue in a straightforward and cost-effective manner.

Design choices

• The boards use small microcontrollers (LQFP-32). These are ideal for bare-metal projects.
• The boards are designed to fit in a breadboard and are primarily based on PTH components.
• The boards have SWD headers and a jumper that activates the microcontroller's DFU bootloader.

STM32F0 Variant

This variant makes the HSE crystal optional. It uses the HSI48 clock as the main clock, allowing the user to expose the PF0 and PF1 GPIOs to the board pins. The maximum possible clock frequency is the same as the HSI48 (48MHz), which is self-calibrated by the USB host. A crystal is generally only when the USB port is used only to power the device.

Revision 20250412

• Interactive Bill of Materials
• Schematics
• Gerber files
• Supported microcontrollers: STM32F042K4T6, STM32F042K6T6.
• Supports HSE using a HC49 crystal.
• The JP1 solder bridge connects the GPIO PF1 to the board pin F1, and the JP2 solder bridge connects the GPIO PF0 to the board pin F0. These connections should not be made if a crystal is used as HSE.
• The current version of the board has undergone a modification in its pinout. Previously, pins F1 and F0 were interchanged, and they are now unconnected.

STM32G4 Variant

This variant usually requires the HSE crystal, even for USB-connected devices, because the HSI48 clock can't be used as the main clock. This means that if the HSI clock's precision isn't enough for the operation, a crystal must be installed for HSE. The PF0 and PF1 GPIOs are never exposed to the board pins.

Revision 20250412

• Interactive Bill of Materials
• Schematics
• Gerber files
• Supported microcontrollers: STM32G431K6T6, STM32G431K8T6, STM32G431KBT6.
• Supports HSE using a HC49 crystal.
• JP1 solder bridge skips the ferrite bead FB1 if that part is not available, or the application is purely digital.
• Only minor fixes since the previous revision.

Legacy Revisions

We have a dedicated page containing information about all legacy revisions.

License

The hardware is released under a CERN-OHL-S-2.0 license.