enishyseni/pcbdesignA KiCad 8 circuit board project for an STM32F405RGT6-based development board with USB-C connectivity.
Stm32 usbc board is an open-source printed circuit board by enishyseni, from the enishyseni/pcbdesign repository on GitHub. It is a 4-layer board of 55 × 40 mm with 22 parts on 15 nets.
It is built around the STM32F405RGT6 and AP2112K-3.3. Its parts include 12 capacitors, 4 resistors, 2 ICs, 2 switches and 1 connector. It belongs with the STM32 boards of this library.
A KiCad 8 circuit board project for an STM32F405RGT6-based development board with USB-C connectivity.
USB-C (5V) ──► AP2112K-3.3 LDO ──► 3.3V Rail ──► STM32F405RGT6
│ │
├── D+/D- ──────────────────────────── PA12/PA11 (USB OTG FS)
├── CC1 ── 5.1kΩ ── GND │
└── CC2 ── 5.1kΩ ── GND 8MHz Crystal ── PH0/PH1 (HSE)
│
NRST ── 10kΩ ── 3V3 + Reset Button
BOOT0 ── 10kΩ ── GND + Boot Button| File | Description |
|---|---|
stm32_usbc_board.kicad_pro | KiCad project settings (4-layer PCB, net classes) |
stm32_usbc_board.kicad_sch | Complete schematic with all components wired |
stm32_usbc_board.kicad_pcb | PCB layout template (40×30mm, 4-layer stackup) |
sym-lib-table | Symbol library references (KiCad standard libs) |
fp-lib-table | Footprint library references (KiCad standard libs) |
BOM.csv | Full Bill of Materials with MPNs and supplier info |
generate_schematic.py | Python script to regenerate the schematic |
| Ref | Value | Package | Description |
|---|---|---|---|
| U1 | STM32F405RGT6 | LQFP-64 | ARM Cortex-M4 MCU, 168MHz, 1MB Flash, USB OTG |
| U2 | AP2112K-3.3 | SOT-23-5 | 600mA LDO Regulator, 3.3V Fixed Output |
| Ref | Value | Package | Description |
|---|---|---|---|
| J1 | USB-C | 16-Pin SMD | USB Type-C Receptacle (USB 2.0) |
| Ref | Value | Package | Description |
|---|---|---|---|
| C1, C2 | 2.2µF | 0402 | VCAP1 and VCAP2 (STM32 internal regulator) |
| C3 | 10µF | 0805 | 3.3V bulk decoupling |
| C4–C9 | 100nF | 0402 | VDD/VDDA/VBAT decoupling (×6) |
| C10, C11 | 22pF | 0402 | HSE crystal load capacitors |
| C12 | 4.7µF | 0402 | LDO input capacitor |
| Ref | Value | Package | Description |
|---|---|---|---|
| R1, R2 | 5.1kΩ | 0402 | USB-C CC1/CC2 pull-down (device mode) |
| R3 | 10kΩ | 0402 | NRST pull-up to 3.3V |
| R4 | 10kΩ | 0402 | BOOT0 pull-down to GND |
| Ref | Value | Package | Description |
|---|---|---|---|
| Y1 | 8MHz | 3215 SMD | HSE crystal (required for USB timing) |
| Ref | Value | Package | Description |
|---|---|---|---|
| SW1 | Reset | SMD Tactile | Pulls NRST low to reset MCU |
| SW2 | BOOT0 | SMD Tactile | Pulls BOOT0 high for DFU bootloader |
stm32_usbc_board.kicad_proIf you modify the circuit design:
python3 generate_schematic.pyThis regenerates stm32_usbc_board.kicad_sch from the Python source.
fabrication/fabrication/ folder for your PCB manufacturerdfu-util or STM32CubeProgrammer to flash firmwareConnect an ST-Link or J-Link to the SWD pins:
For an 8MHz crystal with specified load capacitance $C_L$:
$$C_{load} = 2 \times (C_L - C_{stray})$$
With $C_L = 20\text{pF}$ and $C_{stray} \approx 5\text{pF}$:
$$C_{load} = 2 \times (20 - 5) = 30\text{pF} \implies 22\text{pF per side (standard value)}$$
The 22pF caps (C10, C11) are suitable for most 8MHz crystals with 18–20pF load spec.
This hardware design is provided as-is for educational and development purposes.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100n | Capacitor_SMD:C_0402_1005Metric | C4, C5, C6, C7, C8, C9 |
| 2 | 10k | Resistor_SMD:R_0402_1005Metric | R3, R4 |
| 2 | 2.2u | Capacitor_SMD:C_0402_1005Metric | C1, C2 |
| 2 | 22p | Capacitor_SMD:C_0402_1005Metric | C10, C11 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 1 | 10u | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 4.7u | Capacitor_SMD:C_0402_1005Metric | C12 |
| 1 | 8MHz | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | BOOT0 | Button_Switch_SMD:SW_SPST_TL3342 | SW2 |
| 1 | Reset | Button_Switch_SMD:SW_SPST_TL3342 | SW1 |
| 1 | STM32F405RGT6 | Package_QFP:LQFP-64_10x10mm_P0.5mm | U1 |
| 1 | USB_C | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
It measures 55 × 40 mm and has 4 copper layers, 1.6 mm thick.
22 parts, built around the STM32F405RGT6 and AP2112K-3.3. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the enishyseni/pcbdesign repository on GitHub, at the commit this page was made from: the board is stm32_usbc_board.kicad_pcb and its schematic stm32_usbc_board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask enishyseni before reusing the design.
GabuGravin41/rlpcb
RL PCB sits beside KiCad and works like a senior hardware engineer looking over your shoulder. You describe what you want to build; it helps you choose real parts from your KiCad libraries, works out the values, places…
ajisrawi/5g-3d-printed-drone
3D-printed quadcopter with a custom F405 flight controller, 4G/5G companion connectivity, and phone control
eggsacc/pcb-MeowCU
4-layer STM32F405RGT6 MeowCU 🐱 (MCU) dev module with commonly used peripherals broken out for easy access, and a dedicated CAN transceiver. Also includes 2 user programmable buttons and mini OLED display.
stefanpopovic-dev/fpv-flight-controller
An open-hardware, 4-layer FPV flight controller board built around the STM32F405RGT6, designed in KiCad. Currently at hardware revision REV3. Designed to run Betaflight.
shamansystems/Cheap-FOCer-2
Low-Cost Motor Controller based on the VESC 6
pms67/LittleBrain-STM32F4-Sensorboard
STM32F4-based PCB interfacing with a variety of sensors.
nordstream3/FOC
Date | Manufacturer | amount | includes | shipping & tax | price | -------- | -------- | -------- | -------- | -------- | -------- | 2024-01-17 | JLCPCB | 10 boards | All assembled excl fets and caps | YES, to EU |…