F401 Minimal System Board

Onboard TLV62596 (DC-DC) . I bought more and used it for the microcontroller. It has 2A current and does not burn no matter how I play. The chip produced by TI is still good.

There is a CH340N usb to ttl chip onboard. The main reason is that this chip is small and easy to draw (it has its own crystal inside). Although it is more comfortable to use USB VCP (an advantage), it can also be used for DFU self-service downloading.

The board is verified to be normal through all functions.

If you buy a chip on Taobao, it is most likely a disassembled chip. Just use stlink to unlock it.

Then there is the design problem : I parachuted the RST and did not put it on the pins. I only gave the buttons, which made it difficult to build the bottom board and could not lead out the RST. The author is lazy and doesn’t want to draw anymore. Friends who have time can draw by themselves.