CH340: Difference between revisions

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=== Features ===
=== Features ===
* 🔌 **USB 2.0 Full-Speed Interface**: Supports data transfer rates up to 12 Mbps.
* 🔌 '''USB 2.0 Full-Speed Interface''': Supports data transfer rates up to 12 Mbps.
* ⚡ **Voltage Compatibility**: Operates at both '''3.3V''' and '''5V''' (configurable), accommodating various logic levels.
* ⚡ '''Voltage Compatibility''': Operates at both '''3.3V''' and '''5V''' (configurable), accommodating various logic levels.
* 🧰 **Minimal External Components**: Requires only a crystal oscillator and a few capacitors for operation.
* 🧰 '''Minimal External Components''': Requires only a crystal oscillator and a few capacitors for operation.
* 💾 **Driver Support**: Compatible with Windows, macOS, and Linux operating systems.
* 💾 '''Driver Support''': Compatible with Windows, macOS, and Linux operating systems.
* 🔄 **Standard UART Interface**: Provides '''TXD''', '''RXD''', '''RTS''', and '''CTS''' signals for serial communication.
* 🔄 '''Standard UART Interface''': Provides '''TXD''', '''RXD''', '''RTS''', and '''CTS''' signals for serial communication.
* 🧱 **Compact Package**: Available in SOP-16 package, suitable for space-constrained applications.
* 🧱 '''Compact Package''': Available in SOP-16 package, suitable for space-constrained applications.


=== Pinout ===
=== Pinout ===

Revision as of 12:11, 15 May 2025

CH340G USB-to-Serial Adapter

The CH340G is a low-cost USB-to-Serial (UART) bridge chip developed by WCH (Nanjing QinHeng Microelectronics). It enables communication between USB-equipped computers and devices with UART interfaces, such as embedded systems and microcontrollers. Widely used in development boards like Arduino clones, the CH340G is favored for its affordability and reliability.

Features

  • 🔌 USB 2.0 Full-Speed Interface: Supports data transfer rates up to 12 Mbps.
  • ⚡ Voltage Compatibility: Operates at both 3.3V and 5V (configurable), accommodating various logic levels.
  • 🧰 Minimal External Components: Requires only a crystal oscillator and a few capacitors for operation.
  • 💾 Driver Support: Compatible with Windows, macOS, and Linux operating systems.
  • 🔄 Standard UART Interface: Provides TXD, RXD, RTS, and CTS signals for serial communication.
  • 🧱 Compact Package: Available in SOP-16 package, suitable for space-constrained applications.

Pinout

Pin Number Name Description
1 VCC Power supply input (3.3V or 5V)
2 GND Ground
3 TXD Transmit data output
4 RXD Receive data input
5 RTS Request to send output
6 CTS Clear to send input
7 DTR Data terminal ready output
8 DSR Data set ready input
9 RI Ring indicator input
10 DCD Data carrier detect input
11 XI Crystal oscillator input
12 XO Crystal oscillator output
13 UD+ USB D+ signal
14 UD- USB D- signal
15 RESET Reset input
16 NC No connection

Applications

  • 🛠️ **Firmware Uploading**: Used to program microcontrollers via UART bootloaders.
  • 🖥️ **Serial Debugging**: Facilitates communication with serial consoles for debugging purposes.
  • 🔧 **Device Modding**: Enables interfacing with UART ports on various hardware for customization.
  • 📡 **Sensor Data Logging**: Collects data from serial-output sensors for analysis.

Driver Installation

  • **Windows**: Requires installation of the CH340 driver from the manufacturer's website.
  • **macOS**: Compatible with macOS 10.9 and later; driver installation may be necessary.
  • **Linux**: Supported natively by most distributions; the `ch341` kernel module handles the device.

Troubleshooting Tips

  • 🔌 **Connection Issues**: Ensure correct wiring of TXD and RXD lines; they should be cross-connected.
  • ⚠️ **Driver Conflicts**: Uninstall conflicting drivers that may interfere with CH340G operation.
  • 🔁 **Loopback Test**: Short TXD and RXD to test the adapter's functionality by checking for echoed data.

External Resources

Retrieved from "https://uart.codes/index.php?title=CH340&oldid=49"