💎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