SparkFun Serial Basic Breakout - CH340C and USB-C

This SparkFun Serial Basic Breakout is an easy-to-use USB-to-Serial adapter based on the CH340C and takes advantage of the handy USB-C connector. With USB-C you can get up to three times the power delivery over the previous USB generation at 1.5A and and also solves the universally frustrating dilemma of plugging a USB cable in correctly, because it’s reversible! The Serial Basic works with 5V and 3.3V systems and possesses the capability to auto install on most operating systems without the need for additional drivers. The Serial Basic uses the CH340C IC to quickly and easily convert serial signals to USB.

The pinout of the Serial Basic mimics the common DTR/RXI/TXO/VCC/CTS/GND pinout found on hundreds of FTDI-to-USB derivatives. It can also be used as a general serial device for debugging (such as with a GPS module). There is a jumper on the rear of the board that controls the output voltage on the VCC pin. By default, the board outputs 3.3V and has 3.3V signals. Changing this jumper to 5V will cause the board to output 5V on the VCC pin with 5V signals.

SparkFun Serial Basic Breakout - CH340C and USB-C Product Help and Resources

SparkFun Serial Basic CH340C Hookup Guide

December 13, 2018

SparkFun Serial Basic Breakout takes advantage of USB-C and is an easy-to-use USB-to-Serial adapter based on the CH340C IC from WCH. With USB-C you can get up to three times the power delivery over the previous USB generation and has the convenient feature of being reversable.

SparkFun Edge Hookup Guide

September 26, 2019

Get to know your Edge board, including both the hardware features for you to utilize as well as how to get talking to it.

How to Install CH340 Drivers

August 6, 2019

How to install CH340 drivers (if you need them) on Windows, Mac OS X, and Linux.

Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

2 Electrical Prototyping

Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
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Looking for answers to technical questions?

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  • Worked great the first time we tried it. Default was 3.3v and signals were correct polarity.

  • I think I'm slightly confused. What's the difference between this and an FTDI Basic Breakout?

    • It is a serial device exactly the same as an FTDI, but with the difference being the chip on the product: a CH340C. It also uses a USB-C connector.

  • I really don't understand why sparkfun does not put a decent voltage selector like jumpers or a small switch on their serial breakouts. :(

    • Hello Vitor! If you look at the picture of the underside of the Serial Basic, it has a jumper for voltage selection (defaults to 3.3V).

      • yeah yeah, i know, but meant actually using jumper headers: For example, this one is a really nice designed one with both a jumper selector to 5V and 3.3V AND disabling the power to the device.

  • if this only had a pin jumper instead of solder pads for the voltage selection it would be more useful than the visiport2.

Customer Reviews

5 out of 5

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No problems using Ubuntu 18.04 and pyserial

I thought that there was a problem with the linux kernel driver, but after using python to talk to the ch340g from a ch340c determined that there was no problem. I was able to transmit and receive at 9600, 115200 and 921600.