CH341A Programmer USB to UART IIC SPI TTL ISP Converter

CH341A Programmer USB to UART IIC SPI TTL ISP Converter is a highly versatile and indispensable tool for electronics engineers and hobbyists who need to interface with various serial communication protocols. This multi-functional module acts as a powerful bridge between a computer’s USB port and external hardware, supporting SPI, I2C (IIC), and UART TTL communication modes. Consequently, it excels at flashing BIOS chips, programming EEPROMs, and debugging microcontrollers with remarkable efficiency. Utilizing the robust CH341A chipset, the programmer ensures stable data rates and broad compatibility across modern operating systems. Furthermore, the integrated jumper allows you to switch between “Parallel” (Programmer) and “Serial” (TTL) modes instantly. Therefore, you should include this compact converter in your toolkit to simplify complex firmware recovery and hardware prototyping tasks.

Key Features:

• Multi-Protocol Support: The device natively handles SPI, I2C/IIC, and UART TTL communication, providing a truly universal interface solution.
• High-Speed Programming: It facilitates rapid data transfer for flashing 24 series (I2C) and 25 series (SPI) flash memory chips.
• Mode Selection Jumper: A physical jumper on the board allows users to toggle between USB-to-Parallel (Programmer) and USB-to-Serial (TTL) functions easily.
• On-board Voltage Regulation: The module includes an integrated regulator to provide stable 3.3 V and 5 V power outputs for target components.
• ZIF Socket: Most variants feature a high-quality Zero Insertion Force (ZIF) socket, which ensures secure contact and prevents physical damage to delicate IC pins.

Technical Specifications:

• Main Chipset: WCH CH341A
• USB Interface: USB 2.0 (Full Speed 12 Mbps)
• Output Voltages: 3.3 V and 5.0 V (Selectable/Simultaneous)
• Supported EEPROM/Flash: 24XX Series (I2C) and 25XX Series (SPI)
• Baud Rate (UART): Supports standard baud rates up to ≈ 2 Mbps
• Operating Current: ≈ 30 mA to 100 mA (Depending on load)
• Status Indication: On-board Power LED and Data Transfer indicator.

Mechanical Specifications:

• Package Style: Open PCB Module with USB Type-A Male Connector
• Socket Type: 16-Pin ZIF (Zero Insertion Force)
• Header Pins: Standard 2.54 mm (0.1 inch) Pitch headers for ISP/UART signals
• PCB Finish: High-durability solder mask with clear silk-screen labeling

Dimensions:

• Total Length: ≈ 65 mm (Including USB connector)
• Width: ≈ 27 mm
• Height: ≈ 15 mm (Including ZIF socket lever)
• Weight: ≈ 22 g

Pinout and Wiring:

• USB Connector: Standard USB Type-A male for direct PC connection.
• ZIF Socket (24 Series): Left side of the socket handles I2C EEPROMs.
• ZIF Socket (25 Series): Right side of the socket handles SPI Flash ICs.
• UART Headers: Pins labeled TXD, RXD, and GND provide standard serial communication.
• ISP Header: Provides direct SPI signal access (MOSI, MISO, SCK, CS) for in-circuit programming.
• Power Pins: Outputs 3.3V and 5V relative to the common GND pin for the target device.

Datasheet Reference:

• Download WCH CH341A USB Interface Chip Datasheet

Commonly Used in:

• BIOS Repair: Rewriting corrupted BIOS chips on motherboards, laptops, and graphics cards.
• Router Hacking: Accessing and modifying firmware on networking equipment via SPI or UART.
• Development Kits: Serving as a low-cost ISP programmer for AVR or alternative microcontrollers.

Applications:

• Firmware Recovery: Unbricking devices after failed software updates.
• EEPROM Cloning: Copying configuration data between similar integrated circuits.
• Serial Debugging: Monitoring real-time logs from embedded systems using a terminal emulator.
• Hardware Research: Dumping firmware from unknown chips for security analysis or reverse engineering.

Equivalent Models:

• CP2102: A popular USB-to-UART bridge, however, it lacks the I2C and SPI programming features of the CH341A.
• FT232RL: A highly robust serial converter, but it usually requires bit-banging for SPI/I2C operations.
• Blackcat USB: A professional-grade multi-protocol programmer, although it carries a significantly higher price point.

Package Includes:

• 1 x CH341A Programmer USB to UART IIC SPI TTL ISP Converter Module