Emulate standard UART interface, used to upgrade the original serial devices or expand additional UART via USB.Only compatible with the applications, and cannot be absolutely the same.RoHS compliant SOP-28, SSOP-20 and QFN28 lead-free package.Low cost, convert the original serial port peripheral devices, the original print port printer, and the original parallel port peripheral devices to USB directly.Optional: customize the vendor ID, product ID, serial number, etc.Full speed USB device interface, USB 2.0 compatible.In addition, CH341B/F/A support commonly used synchronous serial interfaces such as 2-wire interface (SCL line, SDA line) and 4-wire interface (CS line, SCK/CLK line, MISO/SDI/DIN Line, MOSI/SDO/DOUT line), etc.

In parallel port mode, CH341 provides an 8-bit parallel interface in EPP mode or MEM mode for input and output data directly without a microcontroller/DSP/MCU. In LPT mode, CH341 provides a standard USB print port compatible with USB-related specifications and the Windows operating system for upgrading a print port printer directly to the USB. In UART mode, CH341 provides UART transmit enable, UART receive ready rate control signals and so on, and common MODEM interface signals, to expand UART interface of computer or upgrade common serial communication devices to USB directly. CH341 is a USB converter chip, which converts USB to serial UART interface, printer interface, parallel port interface, and common 2/4 synchronize serial communication interfaces etc.

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