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):
(1) UART model: the jumper cap is inserted into the UART, the D2 indicator light (blue) on;
(2) I2C/SPI and EPP/MEM parallel mode: the jumper cap is inserted into the I2C/SPI, the D1 indicator light (red) on;
(3)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 Fasizi CH341A USB to UART/IIC/SPI/TTL/ISP adapter EPP/MEM Parallel converter