CH340

1. PCB size: 14.86mm*11.5mm
2. PCB color: Black immersion gold
3. Utilizes the new CH340E chip, supporting all commercially available operating systems
4. Pinout includes inputs: GND, D+, D-, VCC; outputs: GND, TX, RX, VCC
5. Module input power supply: 3.3-5V; outputs default to 5V. To switch to 3.3V power, remove the 5V resistor and replace the 3.3V pad with a 0R resistor. Signal level: 3.3V.

CP2102

1. PCB size: 14.86mm*11.5mm
2. PCB color: Black immersion gold
3. Utilizes the new CP2102 chip, supporting all commercially available operating systems
4. Pinout includes inputs: GND, D+, D-, VCC; outputs: GND, TX, RX, VCC
5. Module input power supply: 3.3-5V; outputs default to 5V. To switch to 3.3V power, remove the 5V pad resistor. Replace the 3.3V pad with a 0R resistor. Signal level: 3.3V.

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