Description
CH340N USB to TTL Converter Module
The UGE CH340N USB to TTL Converter Module is a compact, reliable, and cost-effective USB-to-serial communication adapter. It allows easy interfacing between a PC’s USB port and microcontrollers or other UART-based devices. Designed around the CH340N chip, this module offers stable communication at various baud rates and supports 5V logic levels, making it ideal for development, programming, and debugging tasks.
Key Features
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💻 USB to TTL Serial Converter — enables communication between a USB host (PC/laptop) and UART-based devices.
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⚙️ High Stability CH340N Chip — proven performance with robust signal integrity and wide driver support for Windows, Linux, and macOS.
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🔌 Built-in PCB USB Connector — designed for direct plug-in to a USB port (Type-A male edge).
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⚡ 5V Logic Level Output — suitable for Arduino, ESP8266, STM32, AVR, and other 5V microcontrollers.
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🔄 Standard UART Interface — provides RST, RXD, TXD, +5V, and GND pins for flexible integration.
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💡 Onboard Power LED Indicator — indicates active USB connection and power status.
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🧩 Compact PCB Design — ideal for breadboard use, development boards, or direct wiring applications.
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🔧 Protection Components — includes filtering capacitors and series resistors for reliable operation and ESD protection.
Technical Specifications
| Parameter |
Specification |
| IC |
CH340N (USB to UART bridge) |
| USB Connector |
PCB edge Type-A male |
| Interface Pins |
RST, RXD, TXD, +5V, GND |
| Logic Voltage |
5V |
| Input Voltage (from USB) |
5V DC |
| Baud Rate |
2400 bps to 2 Mbps |
| Communication Format |
8 data bits, 1 stop bit, no parity (default) |
| Operating Temperature |
-40°C to +85°C |
| Driver Compatibility |
Windows XP/7/8/10/11, Linux, macOS |
| PCB Dimensions |
Approx. 38 × 18 mm |
| Current Consumption |
<15 mA (idle) |
Pin Description
| Pin |
Function |
| RST |
Reset output for microcontroller or ISP interface |
| RXD |
Receive data (from target device TX) |
| TXD |
Transmit data (to target device RX) |
| +5V |
USB 5V output (can power small circuits) |
| GND |
Ground reference |
Typical Applications
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USB-to-serial communication with Arduino, STM32, ESP8266, and other microcontrollers
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Firmware uploading / bootloader communication
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Debugging serial output from embedded systems
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USB interface for TTL-level serial modules (GPS, GSM, Bluetooth, etc.)
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General-purpose serial data transfer or logging
Included Components
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Fully assembled CH340N USB-TTL converter board
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Onboard resistors (22 Ω for D+/D- lines)
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Decoupling capacitors (100 nF and 104)
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Power LED indicator
Usage Notes
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Plug the module directly into your PC’s USB port.
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Install CH340 drivers if not already available (download from WCH official site).
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Connect the RX pin of the module to the TX of your target device and vice versa.
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Use the +5V and GND pins to power your circuit if needed.
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Open your preferred serial terminal software (e.g., Arduino Serial Monitor, PuTTY) to communicate.
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