CH340: Difference between revisions
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=== External Resources === | === External Resources === | ||
* [ | * [https://www.alldatasheet.com/view.jsp?Searchword=CH340G Official CH340G Datasheet (PDF)] | ||
* [ | * [http://wch.cn WCH Official Website] | ||
* [ | * [http://www.wch.cn/downloads/CH341SER_EXE.html CH340G Driver Downloads] | ||
[[Category:USB-to-Serial Adapters]] | [[Category:USB-to-Serial Adapters]] | ||
[[Category:Hardware Modding]] | [[Category:Hardware Modding]] | ||
Revision as of 12:12, 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.