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Project Notes

#736 CH340 on Apple Silicon

Programming over CH340-based serial interfaces (such as with some versions of the Arduino Nano) from macOS on Apple Silicon



Apple’s macOS does not come with drivers for the CH340 series of USB-Serial interface chips.

The CH340 is commonly used instead of FTDI chips and drivers. They are produced by 南京沁恒微电子股份有限公司 (Nanjing Qinheng Microelectronics Co., Ltd.).

Circuit Design

I am testing with a version of the Arduino Nano that uses the CH340G chip.



Obtaining Drivers

Current drivers are available for Mac, Windows and Linux. Mac download here.

The download includes:

  • CH34xVCPDriver.pkg - I think for use with OS X 10.9 to OS X 10.15
  • CH34xVCPDriver.dmg - for use in later macOS version (this is the driver I am using)
  • CH34X_DRV_INSTAL_INSTRUCTIONS.pdf - installation instructions

Driver Installation

Running CH34xVCPDriver.dmg - drag to Applications to install as usual


run the app from the Applications folder. Grant first-time access


System Extension is initially blocked - go to System Settings


From System Settings, allow the application:


Install is a success!


Programming a CH340G Nano

Plugging in my Nano with hte CH340G interface driver, I see it correctly recognised in the System Report USB tree. The Vendor ID 0x1a86 is the expected value.


Programming the Nano with the AppleSilicon.ino sketch works perfectly:


Credits and References

About LEAP#736 ArduinoAVRApplemacOSUSB
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LEAP is just my personal collection of projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

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