CH341T USB to UART & I2C Serial 2-in-1 Converter Module - Dual Mode

Specifications

• Chipset: CH341T.

• USB Interface: USB 2.0 Full Speed (Standard Type-A).

• UART Mode: Supports baud rates from 50bps to 2Mbps with a full-duplex hardware buffer.

• I2C Mode: Master mode support with 4 selectable speeds (20K, 100K, 400K, 750K).

• Operating Voltage: Dual 3.3V and 5V support (Jumper Selectable).

• Indicators: Dedicated on-board LEDs for Power, UART activity, and I2C/SPI status.

• Protection: Integrated 500mA self-recovery fuse to protect your PC's USB port.

• Compatibility: Windows (7/8/10/11), Linux, and macOS.

Key Applications & Projects

• EEPROM/Flash Programming: Read and write to 24-series I2C EEPROMs directly from your PC.

• Sensor Debugging: Test I2C sensors (MPU6050, BME280, OLEDs) without writing a single line of MCU code.

• Industrial Protocol Bridging: Convert legacy serial equipment to modern USB interfaces.

• Automated Testing: Use Python or LabVIEW to control I2C peripherals during hardware-in-the-loop (HIL) testing.

Project Evolution

• Past Projects (Prerequisites): If you’ve used basic CP2102 or CH340 modules for simple serial logging, you’re ready for the next step.

• Feature Upgrade: This module unlocks the ability to act as an I2C Master. This means you can "talk" to sensors directly from your computer terminal—a massive time-saver compared to uploading code to an Arduino every time you want to change a register.

• Effort/Requirements: Intermediate. Requires basic knowledge of I2C addressing and driver installation.

Virtual Technician & Wiring

⚠️ Safety Warning: Always set the voltage jumper (3.3V or 5V) before connecting your target device to prevent overvoltage damage.

Helpful Tutorials & Resources

• CH341T USB to UART I2C Serial 2 in-1 Converter Module-Tutorials

• CH341 Driver Download

• I2C Debugging Guide with Python

Package Includes: 1 x  CH341T USB to UART & I2C Serial 2-in-1 Converter Module

Frequently Asked Questions (FAQ)

• What is the difference between CH341T and CH341A? The 'T' version is more compact and optimized for UART/I2C, whereas the 'A' version often includes parallel port features not needed for serial debugging.
• Does this work with Windows 11? Yes, it uses the standard WCH serial/parallel driver suite.
• Can I use this as an SPI programmer? While the CH341 chip supports SPI, this specific breakout is optimized for UART and I2C.
• How do I switch between UART and I2C? Move the on-board jumper to the labeled mode pins before plugging in the USB.
• Does it support 1.8V logic? No, it supports 3.3V and 5V levels.
• Can it program an Arduino? Yes, it can be used as a standard USB-to-Serial uploader for Arduino Pro Mini or custom boards.
• Is there a Linux driver? Yes, it is supported by the ch341 kernel driver.
• What is the maximum I2C speed? It supports up to 750kHz, though 400kHz is the standard stable limit.
• Can I read BIOS chips with this? Yes, for 24-series EEPROMs. For 25-series SPI Flash, an SPI-specific variant is recommended.
• Does it include pull-up resistors for I2C? Yes, the board includes integrated pull-ups for stable I2C communication.
• Can it power my external sensor? Yes, but limit current draw to under 200mA.
• Is it compatible with macOS? Yes, drivers are available from the manufacturer (WCH).
• Why are there two LEDs? One indicates power, while the other shows data transmission activity.
• Can I use this with Python? Yes, libraries like pySerial (UART) and smbus (I2C) are compatible.
• What is the default I2C address of the module? As a Master, it does not have an address; it initiates communication with Slaves.
• Is it breadboard friendly? Yes, the standard 2.54mm pitch pins fit perfectly.
• Does it support hardware flow control? This specific module breaks out the primary UART pins; full hardware handshaking is not supported on this compact header.
• Can I use this for 2-wire serial (TTL)? Yes, that is the primary UART function.
• What happens if I set the jumper to 5V for a 3.3V sensor? You will likely damage the sensor's I/O pins. Always double-check!
• Is this genuine WCH silicon? Yes, we source only original-grade chips for consistent timing and driver stability.