CH9328 is a serial UART to HID keyboard chip that is identified as a standard USB HID keyboard device on computers. CH9328 supports one-way data transmission, it can receive the serial UART data (such as ASCII code), and according to the HID keyboard device specification, the data is packaged into a standard keyboard code and uploaded to the computer through the USB port. Through the provided Windows software, the user can also configure the chip’s VID, PID, and various string descriptors. The figure below shows the diagram of its general application.
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|CH9340DS.PDF||CH9340 datasheet, USB CDC to single serial port, built-in crystal oscillator, supports built-in CDC driver in operating system.|