Spark Logic

BluePill F4 connection guide

BluePill F4 BluepillF405 prototype wiring guide with power, signal assignments, and bench checks.

BluepillF405 prototype

54 contacts Current package

STM32duino community project · The prototype schematic fits STM32F405RGT6 and uses separate 3.3 V digital and analog regulators. Confirm the PCB revision before applying these header numbers.

Power the board from USB

Required

Use a single USB cable to power the board through its native connector. Leave external power headers disconnected. Check the 3.3 V rail before attaching the debug probe.

Bench checks

  • Identify the USB power input and ground in the board schematic.
  • Measure roughly 3.3 V between the board logic rail and ground. Check for a short or wrong connector if the rail is low.

BluepillF405 prototype connector map

Connection scenarios

Attach an SWD probe

Use the USB supply from the required step. Configure the probe for a powered 3.3 V target. Connect the probe’s reference input to the board logic rail, then wire SWDIO, SWCLK and ground.

Bench checks

  • Check pin 1 orientation and verify each connection with the cable unplugged.
  • Select the exact MCU and use a low SWD clock for the first connection.

BluepillF405 prototype connector map

BluepillF405 prototype wiring map

Highlighted contacts are used in the required step or selected circuit. Select a contact to inspect it.

Header · J5
Use the board connector marking and locate contact 1 before wiring.
Header · J6
Use the board connector marking and locate contact 1 before wiring.
SWD header · J1
Use the board connector marking and locate contact 1 before wiring.
USB connector · J2
Use the board connector marking and locate contact 1 before wiring.
Boot header · J3
Use the board connector marking and locate contact 1 before wiring.
Selected pin details

J6-3 · +5V

Power · Power

Connects to 5V. Use the specified board power connection.

BluepillF405 prototype connector map

Electrical limits · Pin in the reference

Models and documents

The maps follow the listed PCB variants. Match the board markings and connector positions to the referenced schematic before applying power.

BluepillF405 prototype
The prototype schematic fits STM32F405RGT6 and uses separate 3.3 V digital and analog regulators. Confirm the PCB revision before applying these header numbers.