Your cart is empty.
Your cart is empty. Overview
CH341A USB conversion module equipped with CH341A chip, CH341A is a USB bus adapter chip, through the USB bus to provide asynchronous serial port, parallel port, print and 2 line and 4 line common synchronous serial interface, the module can be used for serial expansion, I2C interface EEPROM,SPI interface FLASH and STC MCU programming, program debugging, data acquisition, brush machine etc.
Interface description:
VCC, RXD, TXD, GND: UART interface
VCC, SDA, SCL, GND: I2C interface
MISO,MOSI,SCK,CS2,CS1,CS0,GND,VCC: SPI interface
The 10P_2.54mm pin is print port and EPP/MEM port, pin's definition can refer to manual.
Work mode ( jumper cap on the right of USB):
UART model: the jumper cap is inserted into the UART, the D2 indicator light (blue) on;
I2C/SPI and EPP/MEM parallel mode: the jumper cap is inserted into the I2C/SPI, the D1 indicator light (red) on;
The printer parallel port mode: the need to unplug the jumpers,and SDA and SCL connected together.
The output voltage of VCC and signal level selection (2 jumper cap on the left of USB):
When the 2 jumper cap is inserted into the 3V3 side is 3.3V;
When the 2 jumper cap also plug to the other side is 5V
Package Includes:
1x DollaTek CH341A USB to UART/IIC/SPI/TTL/ISP adapter EPP/MEM Parallel converter
Morgan
Reviewed in the United States on March 18, 2025
doesn’t work well. We had a sold some other stuff to it to make it work well.
Matthew Johnson
Reviewed in the United States on March 10, 2025
Connections were bad, never could get it to communicate in order to flash eth01
Midwestern Review
Reviewed in the United States on May 26, 2024
This review should include all the information that the seller didn't provide. Pics include the chip schematic, board layout, and component list. The picture showing the board plugged is illustrating how to connect it in serial port mode, using pins D2 and D5 for the serial port RI (ring indicator) pin and DTR (data terminal ready) pin, respectively. Notice that the jumper is in UART mode, to enable full serial port conversion.To enable SPI/I2C/EPP/MEM mode, move the jumper over to the other side of that 3-pin header. Then for printer parallel port mode, remove the jumper from that header and move it to short out the SCA and SCL pins on the other 16-pin header.For 5v outputs, leave the two bottom jumpers connected to the 2 pins nearest the USB side of the board. For 3.3v outputs, move the two bottom jumpers to the left side of that 6-pin header.This board works great for so many purposes. It's not a bad idea to have a couple on hand for random projects! For the price and quick delivery (next day for me) you cannot beat it.Modern Linux distributions do not need any additional software driver installed for the serial port mode.
Customer
Reviewed in the United States on December 24, 2024
Have to be very careful because only the pens are soldered to the board not the metal shield part so they bend quite easily and it's difficult to work with that way
hermes
Reviewed in the United States on December 15, 2024
Unlike the popular Black/Yellow ch341A board, this one does not pump out 5v when set to 3.3v. All I've used it for so far is dumping/patching/flashing a SPI flash IC, but it worked well for what I needed it to do, so I expect its other functions are equally sufficient.
Mike
Reviewed in the United States on April 3, 2024
Long story short. I have two NOS 2.5" PATA HDDs. They both worked on Windows with a USB to PATA adapter but only one worked with a BOSE Lifestyle AV48, an ancient surround sound system. The two HDDs had different firmware revisions.If a swapped the HDD controller boards the problem stayed with the controller.The technician at work helped remove the SOIC flash chips and I was able to read the working firmware flash image and program the second flash chip. That fixed the issue.I needed test leads and clips, the CH341PAR driver, and AsProgrammer.This converter worked seamlessly! Now I need to figure out what to use it for next....
Higgmeister
Reviewed in the United States on April 26, 2024
I purchased this for use as a standard UART (Rx Tx) serial interface. The drivers can be had from wch-ic.com. They have both the SER and PAR drivers there and they work. There is another seller on Amazon for this product that has a picture of this board with descriptions which helped figure out what the different jumpers do. The lack of documentation from this seller is why I only gave it only 4 stars, but the board works as advertised.
Nathan
Reviewed in the United States on October 4, 2023
Works great, just install the driver google CH341A to find it, the company that makes the chip called wch-ic has the driver on their website, and the driver is called CH341SER for USB to serial port (UART) and CH341PAR for USB SPI/I2C/EPP parallel/MEM parallel. Once you install the driver windows should recognize it. You can switch between UART mode and I2C/SPI mode by moving the jumper located near the usb port (it is label). There is also a two jumper to toggle between 3.3v and 5.0v logic levels. There is also drivers available for Linux and android as well. Windows can then interface it with any software that uses serial or i2c ports.
Recommended Products
