CH340C USB to TTL Serial Module Micro usb

SKU: FA2046-1
Main Chipset

CH340C (Crystal-less Version)
USB Interface

Micro-USB (Type-B)
Output Logic

3.3V or 5V (Selectable via Jumper)
Baud Rate Range

50 bps to 2 Mbps
Power Output

5V (up to 500mA) / 3.3V (up to 100mA)
Supported OS

Windows 7/8/10/11, macOS, Linux, Android
Communication

Full-Duplex UART
PCB Dimensions

~25mm x 16mm
Product Description
The CH340C Micro-USB to TTL Serial Module is a versatile and cost-effective solution for establishing a reliable serial link between your computer and microcontroller. Utilizing the advanced CH340C chipset, this module features an internal clock oscillator, eliminating the need for an external crystal and resulting in a more compact, vibration-resistant board design.
Equipped with a standard Micro-USB port, it allows you to use the same common cables found with smartphones and modern electronics. The module is a “must-have” for developers, providing a bridge for uploading code, debugging terminal outputs, and flashing firmware. With an onboard jumper to switch between 3.3V and 5V logic, it is fully compatible with a wide range of hardware, from classic Arduino boards to modern, low-power ESP32 and STM32 systems.
Key Features
  • Integrated CH340C Chipset: High-performance USB-to-serial conversion with an internal oscillator for improved stability and a smaller footprint.
  • Universal Micro-USB Interface: Convenient connectivity using standard Micro-USB cables—no specialized adapters required.
  • Dual-Voltage Versatility: Easy-to-use jumper allows you to toggle the VCC and logic levels between 3.3V and 5V to match your project’s requirements.
  • Onboard Status LEDs: Includes Power (PWR), Transmit (TX), and Receive (RX) indicators for instant visual debugging and data flow confirmation.
  • Built-in Fuse Protection: Features a self-restoring fuse to safeguard your computer’s USB port against accidental overcurrent or short circuits.
  • Full Pinout Access: Provides all essential pins (3.3V, 5V, TXD, RXD, GND, and DTR) for standard serial communication and “Auto-Reset” programming.
Usage & Applications
  • Microcontroller Programming: Effortlessly upload sketches to Arduino Pro Mini, ESP8266, and custom-built AVR/ARM boards.
  • Firmware Flashing: Update or recover software on routers, hard drives, WiFi modules, and 3D printer motherboards.
  • Serial Debugging: Monitor real-time serial print statements from your embedded code to identify and fix bugs.
  • Industrial Interfacing: Connect TTL-level sensors (GPS, Fingerprint Scanners, Bluetooth) to a PC for data logging.
  • IoT Development: A compact bridge for configuring ESP32 or LoRa modules during the prototyping phase
Q: How does the CH340C differ from the standard CH340G?

The CH340C includes a built-in clock crystal. This makes the module more reliable in environments with physical vibration and allows for a smaller overall PCB size while maintaining 100% driver compatibility with the CH340G

Q: Do I need to install drivers?

Most Windows 10/11 and Linux systems will automatically detect the CH340C. If not, the CH340 driver is widely available and very easy to install

Q: Can I use this to program an Arduino Pro Mini?

Yes. This module includes the DTR pin, which is necessary for the “Auto-Reset” function in the Arduino IDE. Simply connect DTR to the Reset pin on your Pro Mini

Q: What happens if I set the jumper incorrectly?

If you send 5V logic to a 3.3V device (like an ESP8266), you risk damaging the device. Always double-check that your jumper matches the operating voltage of your microcontroller before connecting

Q: Can this module be used as a power supply for my project?

It can provide a small amount of power (up to 500mA on the 5V rail). While sufficient for basic sensors and small MCUs, high-power components like motors or cellular modems will require a separate power source

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