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USB To TTL Serial 5v/3.3v Alternative CH340G Module

USB To TTL Serial 5v/3.3v Alternative CH340G Module

The CH340 is a USB bus conversion chip that enables USB to UART or USB to printer interface functionality. In UART mode, the CH340 provides standard MODEM control signals and is commonly used to expand UART interfaces on computers or upgrade traditional serial devices to communicate over USB.
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Features:

  • Full-speed USB device interface, compatible with USB V2.0.
  • Emulates a standard UART interface, useful for upgrading serial peripherals or expanding UART interfaces via USB.
  • Fully compatible with existing serial applications on Windows — no software modifications required.
  • Hardware full-duplex UART interface with built-in transmit and receive buffers.
  • Supports baud rates from 50bps up to 2Mbps.
  • Supports standard MODEM signals: RTS, DTR, DCD, RI, DSR, CTS.
  • Can be used with external level conversion chips to provide RS232, RS485, RS422 interfaces.
  • CH340R variant supports IrDA SIR infrared communication, with baud rates from 2400bps to 115200bps.
  • Software compatible with CH341, using the same driver.
  • Supports 5V, 3.3V, and even 3.0V power supply.
  • CH340E includes a built-in crystal oscillator — no external crystal required.

CH340 USB to UART Module

STC Microcontroller Download Mode:

  1. Connect the following three wires:
    • TXD (from USB downloader) → P3.0 (RX) on STC MCU
    • RXD (from USB downloader) → P3.1 (TX) on STC MCU
    • GND (from USB downloader) → GND on STC MCU
  2. Power the development board separately.
    Note: Even with the board's power switch off, the power LED may dimly light up — this is normal. Use serial mode to download firmware. Ensure the system is cold started after powering.

STM32 Microcontroller Download Mode:

  1. Connect the following three wires:
    • TXD (from USB downloader) → PA10 (RX1) on STM32
    • RXD (from USB downloader) → PA9 (TX1) on STM32
    • GND (from USB downloader) → GND on STM32
  2. Power the STM32 board either separately or through 5V via the USB downloader.
    During download:
    • Set BOOT0 to VCC
    • After download, set BOOT0 back to GND
    • Press the reset button to complete the process

Operating System Support:

  • Windows 7 (32-bit and 64-bit)
  • Windows XP