The chip is based on CH340C, which requires no external crystal oscillator and simplifies the circuit. Add a 100nF decoupling capacitor to the 3V3 pin. Failure to add it may cause the CH340 to generate a lot of heat and fail to work.
The onboard AMS1117 LDO provides 3.3V and 5V common voltages.
Lead out 5v, 3v3, TXD, RXD, DTR, RTS, easy to connect to any DuPont line interface
The 3p interface leads to TXD and RXD for data transmission, and GND is used to establish the same ground, otherwise there may be problems with the serial port data.
5p adds RST and BOOT lines to the 3p interface. During automatic downloading, RST and BOOT will be pulled down. Just connect the lines to the corresponding pins.
I don’t have much experience with drawing boards. Please let me know if I have any shortcomings.
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