CH340G
Overview
The CH340G is a low-cost USB-to-UART bridge IC from WCH. It provides a USB 2.0 interface and converts between USB and TTL-level serial, with support up to 2 Mbaud. The device comes in a small SOP-16 package and is widely used as an inexpensive alternative to FTDI USB-serial chips.
Why Choose This Part
Very low unit cost and widespread use make the CH340G attractive for budget products and hobbyist boards. Drivers are readily available and many operating systems already include or support CH34x drivers, so devices typically enumerate as a standard COM/ttyUSB port. The SOP-16 package is easy to place on PCBs or include on small breakout boards.
Applications
Getting Started
Commonly found on inexpensive Arduino-compatible boards and USB-serial adapters; to use, install the WCH drivers if your OS does not already recognize the chip, then connect TX, RX and GND to the target and open a serial terminal (PuTTY, minicom, screen) at the target baud rate. Verify voltage levels on the target before connecting (many breakouts offer either 3.3V or 5V operation).
