Here is a basic design of a battery-powered STM32 board with USB:
- STM32 Microcontroller: Select an appropriate STM32 microcontroller that suits your application requirements. Consider factors such as the number of I/O pins, processing power, and memory.
- Power Management: Design a power management circuit to handle the battery charging and power supply to the STM32 board. This may include a charging circuit for connecting a USB power source or an external battery charger, as well as a power boost circuit to ensure stable power supply during operation.
- USB Connector: Include a USB connector for connecting the board to a computer or other USB devices. This allows for programming, data transfer, and power supply via USB.
- Battery: Select a suitable battery to power the STM32 board. Common options include lithium-ion batteries or rechargeable batteries. Consider factors such as battery capacity, voltage, and charging requirements.
- Voltage Regulation: Use voltage regulators to ensure that the proper voltage levels are supplied to the STM32 microcontroller and other components on the board. This helps protect the components from overvoltage or undervoltage conditions.
- Clock Circuit: Design a clock circuit to provide the necessary clock signal for the STM32 microcontroller. This may include an oscillator or crystal resonator.
- Reset Circuit: Include a reset circuit to ensure proper reset of the STM32 microcontroller during power-up or reset events.
- Peripherals: Depending on your application, you may need to add various peripherals such as LEDs, buttons, sensors, or communication interfaces (e.g., UART, SPI, I2C) to the board.
- PCB Design: Create a printed circuit board (PCB) layout to house the components and connect them properly. Ensure proper trace routing, ground planes, and component placement for signal integrity and electromagnetic compatibility.
- Programming and Debugging: Consider the options for programming and debugging the STM32 board. This may include using an onboard debugger or an external debugger/programmer.
- Enclosure and Packaging: Design an enclosure or packaging to protect the board and provide a user-friendly interface. Consider factors such as size, shape, and ease of access to connectors and components.
This is just a basic overview of the design process. The specific requirements and features of your application will determine the detailed design and components selection. It is recommended to refer to the STM32 datasheets, USB specifications, and other relevant resources for detailed design guidelines and component selection. Additionally, circuit simulation and prototyping can help validate the design before finalizing the PCB manufacturing.