USB (universal serial bus) and ADC (analog-to-digital converter) interface multiplex circuit

The utility model relates to a USB (universal serial bus) and ADC (analog-to-digital converter) interface multiplex circuit which comprises an external pin, a multiplex control circuit, a USB module and an ADC module. The external pin, the multiplex control circuit and the USB module are sequentially electrically connected, and the external pin, the multiplex control circuit and the ADC module are sequentially electrically connected. The USB and ADC interface multiplex circuit is unique in structure, a chip interface can work in a time-sharing manner in a USB mode and an ADC mode, interface types of a processor are enriched, and the number of universal pins of the processor is decreased.