Using 4-port high-speed USB HUB controller chip CH334 and high-speed USB to 8-port serial port chip CH348, USB can be converted to 32-way high-speed serial port. Compared with the traditional method, the USB to multi-serial port solution implemented by cascading multiple CH340s through a multi-level HUB can save multiple HUB chips and product size, and each serial port of the CH348 has excellent performance in various indicators such as communication speed and communication voltage range. Compared with CH340, they are all enhanced. The eight serial ports of the CH348 chip support independent I/O power supply and hardware flow control, support multiple serial ports for continuous and stable transmission at the highest communication baud rate of 6Mbps, support Windows/Linux/Android/macOS and other operating systems, and can be used in industrial control Host, serial port server, Android embedded motherboard serial port expansion, debugging download, high-speed serial port data recording, etc.
CH334: 4-port USB HUB controller chip, HUB - hub, a USB device used to extend the USB interface between host and device. CH334 can expand 4 USB device ports. The upstream port supports USB2.0 high speed and full speed, and the downstream port supports USB2.0 high speed 480Mbps, full speed 12 Mbps and low speed 1.5Mbps. In addition to CH348Q, CH334 can also be connected to other USB devices, which can realize multi-device combination solutions such as multi-channel serial port + "U disk" + "analyzer".
CH348: USB to 8 serial port chip, each UART has built-in independent sending and receiving FIFO, the sending FIFO is 1K bytes, and the receiving FIFO is 2K bytes. The serial port baud rate supports 6Mbps, and the serial port IO voltage supports 3.3V/2.5/1.8V, etc. Provides up to 48 channels of GPIO and RS485 transceiver control function.
