CH343P is a USB bus adapter chip that realizes USB to high-speed asynchronous serial port. It also supports automatic identification and dynamic adaptation of communication baud rate of 115200bps and below. It provides commonly used MODEM contact signals to expand asynchronous serial ports for computers. Or upgrade ordinary serial devices or MCU directly to the USB bus. In this solution, the 5V or 3.3V serial port power supply can be selected through a jumper cap. The 3.3V voltage is derived from the internal conversion of the chip.
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