CH341A Programmer USB to UART/IIC/SPI/I2C Module User’s Guide

 

1. Hardware Overview

Pin Label	Function	Protocol
TXD/RXD	UART	Serial communication
SCL/SDA	I2C	Clock/Data lines
CS/CLK/MOSI/MISO	SPI	Chip Select, Clock, Data In/Out
GND/VCC	Power	3.3V or 5V depending on jumper

Voltage Note: Always verify jumper settings before connecting. CH341A can output 3.3V or 5V depending on configuration.

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2. Driver Installation

Windows:

1. Download the CH341A driver from WCH official site.
2. Run CH341SER.EXE and install.
3. Confirm device appears in Device Manager under “Ports (COM & LPT)” or “Universal Serial Bus controllers”.

Linux:

sudo modprobe ch341
dmesg | grep ch341

macOS:

Use HoRNDIS or check for CH341A support via USB serial drivers.

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3. Supported Chips & Protocols

• EEPROMs: 24Cxx (I2C), 25xxx (SPI)
• Flash ICs: W25Qxx, AT25DFxxx
• Microcontrollers: Some STM32, ATmega (via UART bootloader)
• UART Devices: ESP8266, ESP32, STM32 (via serial)

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4. Software Tools

Tool Name	Purpose	Notes
AsProgrammer	EEPROM/Flash programming	Supports 24/25 series
CH341A Programmer	Basic GUI tool	Limited chip support
Flashrom (Linux)	CLI flashing tool	Advanced users
PuTTY / TeraTerm	UART terminal	For serial debugging

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5. Wiring Examples

SPI Flash (e.g., W25Q32):

CH341A     →     Flash Chip
CS         →     CS
CLK        →     CLK
MOSI       →     DI
MISO       →     DO
GND        →     GND
VCC        →     VCC (3.3V)

I2C EEPROM (e.g., 24C02):

CH341A     →     EEPROM
SCL        →     SCL
SDA        →     SDA
GND        →     GND
VCC        →     VCC (3.3V or 5V)

UART (e.g., ESP32):

CH341A     →     ESP32
TXD        →     RX
RXD        →     TX
GND        →     GND
VCC        →     VCC (3.3V)

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6. Safety & Best Practices

• Always verify voltage compatibility before connecting.
• Use a logic level shifter if unsure about voltage.
• Avoid hot-plugging ICs while powered.
• For SPI flash, use SOIC8 clip carefully to avoid bent pins.

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7. Troubleshooting

Issue	Solution
Device not recognized	Reinstall driver, try different USB port
Flash not detected	Check wiring, chip orientation, voltage
Write fails	Use external power, reduce SPI speed
UART garbage output	Confirm baud rate and voltage levels

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