STM32 Pro Mini

• STM32 Pro Mini dev board

  • 17.8 x 33mm size (excluding USB port)
  • 28 GPIOs

• Based on STM32F411CEU6 MCU (100MHz ARM Cortex M4 CPU, 512kB Flash, 128kB SRAM) or STM32F103CxT6 MCU (72MHz ARM Cortex M3 CPU, 64kB/128kB Flash, 20kB SRAM)

  • Virtually support all 48 pin packaged(LQFP48, UFQFPN48, ...) STM32 MCUs.

• Two main devices are being supported as of now, one with STM32F103Cx and the other with STM32F411Cx.

Getting a board

Manufacture yourself

• You can manufacture your own STM32 Pro Mini board with provided files in this repo.
• Use gerber files in fabrication/gerber/v6 directory.
• Use BOM and CPL(Pick&Place) files included in fabrication directory.
• Recommended board specifications:
  • Material: FR-4
  • Layers: 2
  • PCB color / silk color: Any
  • Thickness: 1.0mm
  • Surface finish: ENIG
• All parts can be placed with included BOM/CPL file.

Get a free board

• Leave an issue and I may send you a free STM32 Pro Mini board.

Variants and generations

Gen	CPU	Versions	Features	Board peripheral	Default BOOT configuration
1	STM32F103Cx	V1 (STM32F103C8), V3 (STM32F103CB)	8MHz ±20ppm HSE, Compatible with common 'Blue Pill' development boards.	None	BOOT0 (0) BOOT1 (0)
2	STM32F411CE	V2	8MHz ±20ppm HSE	Removable USB port	BOOT0 (0) BOOT1 (0)
3	STM32F411CE	V4, V5, V6	12MHz ±10ppm HSE, 32.768kHz ±20ppm LSE (V5, V6), A dedicated analog power rail with noise supression (V5, V6), Castellated edges (V6 only)	Removable USB port	BOOT0 (0) BOOT1 (0)

ProMini 3rd gen (F411 (V4, V5, V6))

• Fully redesigned STM32 Pro Mini dev board
• A dedicated analog voltage supply for noise reduction (from V5 and afterwards)
• Ultra low noise, low Iq LDO regulator added to minimize static power draw. (from V5 and afterwards)
• LSE crystal added (from V5 and afterwards)
• PB11 pin is removed and additional GND pin is added.

ProMini 2nd gen (F411 (V2))

• Based on STM32F411CEU6 MCU
• PB11 is disabled in this variant, being used to connect a capacitor to supply internal voltage.

BOM

• 2.2uF or 4.7uF ceramic capacitor with low ESR have to placed on C13.
• USB pull-up resistor R1 is not needed. (The MCU integrates pull-up resistor for USB D+.)

ProMini 1st gen (F103 (V1, V3))

• Based on STM32F103C8T6 (V1) / STM32F103CBT6 (V3) MCU
• Compatible with common Blue Pill development board with STM32F103C8T6, except for absence of 32.768kHz crystal.

BOM

• C13 is not needed in F103 variant.
• An 1.5k pull-up resistor R1 for USB D+ is needed.

Schematic

PDF version

PCB layout

Setup for Arduino IDE

• Install STM32duino package along with STM32CubeProgrammer.
• Add ./variants/PROMINI_F411 (V3-V4) or ./variants/PROMINI_F411_V5 (V5, V6) directory to Arduino IDE packages/STM32/hardware/stm32/(version)/variants directory.
• Add the content of boards-add.txt to packages/STM32/hardware/stm32/(version)/boards.txt.

Programming

• USB HID bootloader fork may be used to upload using the integrated USB port.

Tutorial

• Getting started with STM32 Pro Mini