CH340G USB TO TTL Converter Module

CH340G USB TO TTL Converter Module is an essential, low-cost solution for establishing reliable serial communication between a computer and microcontrollers or embedded systems lacking native USB capabilities. This module integrates the popular CH340G chip, providing a stable virtual COM port for quick and easy data transfer. Consequently, you can use it for programming devices like Arduino Pro Mini, ESP8266 modules, or setting up serial consoles. The board design includes selectable voltage levels (3.3V and 5V), making it highly versatile for interacting with diverse logic circuits. Therefore, the CH340G module has become the preferred choice for hobbyists and professionals seeking an efficient, yet affordable, USB-to-UART bridge solution.

Key Features:

• USB-to-Serial Conversion: Utilizes the CH340G IC to provide a stable, standard UART (TTL-level) interface over a USB connection.
• Dual Voltage Output: Features a jumper or switch to easily select 3.3 V or 5 V logic levels for compatibility with various microcontrollers.
• Integrated Status LEDs: Includes LED indicators for power, and dedicated RX/TX activity, allowing for easy monitoring and troubleshooting of data flow.
• Wide Baud Rate Support: Supports common baud rates ranging from 50 bps up to 2 Mbps, accommodating both slow and high-speed serial tasks.
• Driver Compatibility: Drivers are readily available and supported across major operating systems, including Windows, macOS, and Linux.

Technical Specifications:

• Main Chipset: WCH CH340G
• Interface: USB 2.0 (Type-A) to UART (TTL)
• Output Logic Voltage: Selectable 3.3 V or 5 V D_C
• Input Voltage (USB): 5 V D_C
• Maximum Baud Rate: 2 Mbps
• Supported Signals: TX, RX, VCC, GND, DTR/RTS (depending on module version)
• Operating Temperature Range: −40°C to +85°C

Mechanical Specifications:

• Package Type: Small Form Factor PCB Module
• USB Connector: Type-A Male (Direct plug into PC) or Mini/Micro-USB (depending on module variant).
• Pin Pitch: Standard 2.54 mm (0.1 inch) header pins for connection to breadboards or jumper wires.

Dimensions:

• Board Length: ≈ 42 mm
• Board Width: ≈ 16 mm
• Board Height: ≈ 8 mm (Excluding pin length)
• Connector Type: Varies (Often USB Type A, Mini-B, or Micro-B)

Pinout and Wiring:

• VCC: Power output pin. Selectable to 3.3 V or 5 V, supplying power to the connected target device.
• GND: Ground reference pin. Connect to the ground of the target device.
• RXD (Receive Data): Connect this pin to the TX (Transmit) pin of your target microcontroller.
• TXD (Transmit Data): Connect this pin to the RX (Receive) pin of your target microcontroller.
• DTR/RTS: Data Terminal Ready / Request to Send. Used primarily for automatic reset during microcontroller programming (e.g., Arduino).
• Wiring Tip: Always cross the data lines: CH340G TXD goes to MCU RXD, and CH340G RXD goes to MCU TXD. Furthermore, ensure the VCC level matches the target microcontroller’s operating voltage.

Datasheet Reference:

• Download WCH CH340 Datasheet

Commonly Used in:

• Microcontroller Programming: Directly uploading code to devices like the Arduino Pro Mini, ESP-01/ESP8266, and other boards without a built-in programmer.
• Router Hacking: Accessing the serial console of network hardware for configuration and debugging.
• Embedded System Debugging: Sending debug logs from firmware to a computer’s terminal program.

Applications:

• Firmware Upload: Facilitating the bootloader process for microprocessors using UART serial communication.
• GPS Communication: Reading NMEA data streams from GPS modules via serial interface.
• Data Logging: Acting as the interface between a data logger’s UART output and a PC for data retrieval.

Equivalent Models:

• FT232RL (FTDI): The industry-standard USB-to-Serial converter, offering similar functionality but typically at a higher cost.
• CP2102 (Silicon Labs): Another popular and stable USB-to-UART bridge IC, serving as a direct functional replacement.
• PL2303 (Prolific): A long-standing alternative chip often used in budget converter cables. However, it may face occasional driver compatibility issues with newer Windows versions.

Package Includes:

• 1 x CH340G USB TO TTL Converter Module