CH340E USB to TTL Module Pro Mini Downloader
= Ultra-Compact USB to Serial Converter for Arduino and MCU Programming =
This CH340Ebased USB to TTL converter module is a compact, highperformance serial communication adapter designed for programming Arduino Pro Mini, STM32, STC, and ESP8266 microcontrollers .
Builtin Crystal Oscillator Eliminates the need for external crystal, simplifying circuit design
3.3V/5V Selectable Output - Compatible with both 3.3V and 5V logic systems
Operating Voltage: 5VDC input via USB port; selectable 3.3V or 5V output
Communication: Full-duplex UART with support for 50bps to 2Mbps baud rates
Ensure TXD connects to target RXD, and RXD connects to target TXD for proper communication
= Technical Specifications =
| Parameter | Value |
|---|
| Chip | CH340E (SOP8/MSOP10 package) |
| USB Interface | MicroUSB or TypeC (varies by module) |
| Logic Levels | 3.3V or 5V (selectable) |
| Data Rate | 50bps to 2Mbps |
| LED Indicators | PWR, TXD, RXD |
| Protection | 500mA polyfuse (self-resetting) |
| Dimensions | ~16 x 16mm |
= Key Features =
+UltraCompact PCB Design Small footprint ideal for portable and field programming
+DTR Pin Included Supports Arduino Pro Mini autoreset for seamless code uploads
+LED Status Indicators - Visual feedback for power, transmit, and receive activity
+Wide OS Compatibility - Supports Windows 98/ME/2000/XP/Vista/7/8/10, macOS, and Linux
== Applications ==
- Arduino Pro Mini program downloader
- STM32 and STC microcontroller programming
- Serial debugging and UART communication
- ESP8266 and ESP-01 module interfacing
- IoT device development
Ideal for Pro Mini Downloading - Includes DTR pin for automatic reset
Extremely Compact Perfect for portable and onthe-go programming
√ Type-C connector option for modern devices
√ Pre-soldered pin headers for easy breadboard use
√ Replaces CH340G and CH340C with improved features
= Troubleshooting =
Driver not recognized:
- Install CH340 driver manually for Windows (automatic for macOS/Linux)
- For Win10, some versions may require driver rollback to 2014 version
No data transmission:
- Verify TX/RX cross-connection (module TX to target RX, module RX to target TX)
- Check for correct voltage selection (3.3V or 5V)
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