CH9102F is a USB bus adapter chip that realizes USB to asynchronous serial port. Provides commonly used MODEM contact signals for expanding asynchronous serial ports for computers, or directly upgrading ordinary serial devices or MCUs to the USB bus. The CH9102F serial port I/O is independently powered and supports 5V, 3.3V, 2.5V, and 1.8V power supply voltages. In this solution, the serial port voltage of 5V or 3.3V can be selected by shorting VIO with a jumper cap.
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