STM32F103C8T6 minimum system

STM32F103C8T6 microcontroller is the smallest system board, measuring 31.54mm × 40mm. It is very small and suitable for embedding in your own projects. All 34 IO ports are lead out. The spacing is set. It can be inserted directly into the hole board. The input voltage is 5V. SW debugging The pins are lead out individually.

I redrawn a version, which is not much different from the original one. All the resistors and capacitors were replaced with 0603 packages.

Program download method:

1. Serial port download method, use a USB to TTL module, BOOT0 is pulled down by default, use a jumper cap to connect to VCC, PA9-RX, PA10-TX, then connect the module to the computer, use the serial port download software to download the program ;

2. ST-Link download, use an ST-Link downloader, connect it to the SW debugging pin, and use STM32 ST-LINK Utility software or STM32CubeProgrammer software to download. (STM32CubeProgrammer can also use the serial port download method)

The BOM is missing a chip, a pin header and an R5. The chip and pin header are cheaper. Hey, hey, the resistance of R5 can be changed. It doesn’t matter if it’s too small or too big. There’s no need to buy the same 620Ω. Use whatever you have on hand. .

Actual picture front and back