CH340G – alternative USB to serial IC

Summary of CH340G – alternative USB to serial IC


The article discusses the CH340G chip, a low-cost USB-to-serial converter ideal for connecting microcontrollers like Arduino to PCs that lack traditional serial ports. Priced around 40 cents, it offers an affordable alternative to more expensive chips. The challenge addressed is the scarcity of official schematics, as the manufacturer only provides datasheets for other CH340 variants. The author compiled a working pinout, created an Eagle CAD part, and developed example schematics for the CH340G, facilitating its use in embedded programming projects.

Parts used in the CH340G USB to Serial Converter Project:

  • CH340G USB-to-serial converter chip
  • USB connector
  • Crystal oscillator (for clock signal)
  • Capacitors (for filtering and stabilization)
  • Resistors (for signal conditioning)
  • Voltage regulator (if required for power supply)
  • Microcontroller (e.g., Arduino) for serial communication

Hey, sorry everyone, I know it’s been a while. But I hope this post will make up for that! Anyone who has done embedded programming knows that an easy way for microcontrollers (like arduino) to connect  to a PC is through a serial connection. Unfortunately, not many computers have a serial port these days, and while are a lot of chips that will act like a usb-serial converter, they tend to be somewhere in the $3-5 range.

CH340G – alternative USB to serial IC

However, I found one chip, the CH340G, that only costs 40 cents! You can buy it on places like Aliexpress. The only problem is getting a working schematic. The company only releases a datasheet for the CH340T and CH340R versions of the chip. By trawling through several sites, I managed to create a pinout, an eagle part, and example schematics for the CH340G. Here they are!


About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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