JZ-F407VET6: overview of the STM32F407VET6 board

# JZ-F407VET6 Development Board with STM32F407VET6: Hardware Features and Limitations

The JZ-F407VET6 development board is equipped with the STM32F407VET6 microcontroller and offers a comprehensive set of peripheral interfaces for embedded project development. The board is the size of two credit cards, with all components on the top layer of the PCB. Documentation is limited, and the schematics were recovered from open sources.

Main MCU and Peripherals Specifications

STM32F407VET6 is an ARM Cortex-M4 running up to 168 MHz, with 512 KB Flash and 192 KB SRAM. The pinout is brought out to PLD connectors, including key debug pins.

Key interfaces:

• Ethernet DP83848IVV (10/100BASE-TX)
• Two CAN transceivers
• RS485 transceiver
• RS232 (UART1)
• Two USB (Host and Device)
• SDIO for microSD
• SPI NOR Flash 16 MB
• I2C EEPROM 256 KB
• RTC with CR1220 battery
• JTAG for debugging

Silkscreen markings make it easy to navigate the board. 3 mm mounting holes in the corners allow securing the board in an enclosure.

Available Debug Resources

Pins PA8 (MCO1) and PLL are available on P5.4 for monitoring clock frequency. DAC_OUT1 (PA4) and DAC_OUT2 (PA5) are brought out to P4.6 and P4.3—handy for visualizing variables on an oscilloscope.

LEDs on PE13/PE14 support hardware PWM, allowing brightness control without burdening the CPU:

// Example PWM initialization for PE13/PE14
tim1_init();
htim1.Instance->CCR1 = duty_cycle;

HW Reset on S4, three user buttons. GPIOs are brought out to PLD.

Board Strengths

The board is ideal for prototyping thanks to its dense peripheral integration. The hardware RTC keeps time even when powered off. The SD slot (J2) uses SDIO, while SPI NOR and EEPROM expand storage options.

Advantages compared to typical development boards in the table below:

| Feature | JZ-F407VET6 | Typical STM32 board |

|------------------|-----------------|---------------------|

| Ethernet | Yes (DP83848) | Rarely |

| CAN x2 | Yes | Often (1) |

| USB Host/Device | Yes | Often |

| RTC + battery | Yes | Rarely |

| JTAG | Full-featured | Often SWD |

Limitations and Design Notes

No interface protection: missing ESD suppressors and TVS diodes on USB, CAN, RS485. Power supply lacks stabilizers for pulse currents. SD slot without a nearby capacitor—risk of voltage droops under peak card loads.

Other drawbacks:

• No hardware crypto accelerator (unlike STM32F415).
• SDIO instead of SPI for microSD reduces compatibility.
• Only 3 red LEDs, despite space for 5+ indicators.
• Full-size JTAG (20 pins) instead of compact SWD (4-6 pins).
• Sharp PCB corners without chamfers.
• Redundant RS232 instead of a simple UART on PLD.

Project Ideas

The board is well-suited for industrial prototypes. Possible projects:

• USB-to-CAN adapter
• USB-to-RS485 converter
• Ethernet-to-CAN media converter
• USB Flash emulator
• SD Card Reader
• Hardware password manager with RTC

For implementation, use JTAG/RTT for debugging and DAC for signal tracing.

Key Points

• Peripherals for embedded: Ethernet, CANx2, USB, RS485/RS232—ready-made set for industrial interfaces.
• Debugging: JTAG, MCO, DAC on PLD, PWM-LED without CPU overhead.
• Storage: 16MB SPI Flash + 256KB EEPROM + microSD.
• Limitations: No circuit protection, SDIO-only, JTAG instead of SWD.
• Applications: Prototyping CAN/USB/RS485 devices, firmware training.

The extensive peripherals make the JZ-F407VET6 a versatile board for mid-level and senior developers, despite needing tweaks in future revisions.

— Editorial Team