Nothing close enough? Start from a blank circuit diagram → Describe it in one paragraph.
How to use a circuit diagram template.
- 01Select STM32 MCU
Pick an STM32 with Ethernet MAC and UART peripherals, like STM32F107 or STM32H7, from the component library.
- 02Place RS-232 Transceiver
Add a MAX3232 or similar chip to convert RS-232 voltage levels to the MCU’s UART logic.
- 03Add Ethernet PHY
Include a PHY such as LAN8720 or DP83848, connected via RMII to the STM32 MAC.
- 04Wire Signal Paths
Connect UART TX/RX to the transceiver, and RMII/MDC/MDIO lines between MCU and PHY.
- 05Label and Export
Annotate nets with signal names, then download your circuit diagram as a clean PDF or image.
Questions about circuit diagram templates
Which STM32 series support both RS-232 and Ethernet?
STM32F107, F207, F4, F7, and H7 families include Ethernet MAC peripherals and multiple UARTs suitable for RS-232.
Do I need an external Ethernet PHY?
Yes. Most STM32 MCUs with Ethernet require an external physical layer transceiver, such as the LAN8720 or DP83848, connected via RMII.
How do I level-shift RS-232 signals for an STM32?
Use a dedicated RS-232 transceiver like MAX3232 (3.3V) to convert the ±12V RS-232 levels to 3.3V UART logic.
Can these diagrams be used in commercial products?
They are example designs. You should validate component values, PCB layout, and compliance for your specific product requirements.