CH340G STC Microcontroller USB TTL 3.3V 5V Automatic Programmer

Description

CH340G STC Microcontroller USB TTL 3.3V 5V Automatic Programmer

Key Features

• Based on CH340G USB-to-UART converter

• Designed for STC microcontroller programming

• Selectable output voltage: 3.3V or 5V

• Integrated TPS70933DBVR 3.3V LDO regulator

• Dual header arrangement:

  • GND, VCC, TX, RX

  • VCC, GND, TX, RX

• Onboard TX and RX indicator LEDs

• Compact USB direct-plug design

• Stable crystal oscillator for reliable UART communication

Technical Specifications

USB Interface

• USB Type: USB Type-A

• USB-to-Serial IC: CH340G

• Communication Interface: UART (TTL level)

• Baud Rate: Supported by CH340G (software configurable)

Output Voltage

• Selectable via onboard switch:

  • 5V

  • 3.3V

Voltage Regulation

• LDO Regulator: TPS70933DBVR

• 3.3V regulated output for target MCU

• Low dropout and stable output performance

Header Configuration

• 4-Pin Programming Header

• Dual pin layout for compatibility:

  • GND, VCC, TX, RX

  • VCC, GND, TX, RX

Indicators

• TX LED

• RX LED

Board Type

• Fully Assembled and Tested

Power & Programming

• Powered directly from USB port (5V)

• Output voltage selectable (3.3V / 5V) for target MCU

• TTL UART interface for STC ISP programming

• Compatible with official STC ISP programming software

• No external power supply required for small target circuits

Applications

• STC 8051 microcontroller programming

• UART-based firmware downloading

• Embedded development and debugging

• Production programming tools

• General USB-to-TTL serial communication

What’s Included

• 1x STC USB Programmer (Fully Assembled)

Notes

• Ensure correct voltage selection before connecting to target MCU.

• TX of programmer connects to RX of target, and RX to TX.

• Not intended for RS232 voltage-level communication (TTL only).

• Driver installation for CH340G may be required depending on operating system.