UNIVERSAL SERIAL BUS HOST, UNIVERSAL SERIAL BUS SYSTEM AND METHOD OF DRIVING THE SAME

摘要

A USB(Universal Serial Bus) host, a USB system, and a driving method thereof are provided to automatically get out from a deadlock state without removing and reconnecting a USB cable when USB data communication is got into a deadlock state. A device(200) is connected to the host(100) through the USB cable(300). If the deadlock state is generated, the host cuts off power supplied to the device through a power line and supplies again the power to the device after an initialization process. The host includes the first switch for controlling power supply for the device by connecting to the power line. The device is equipped with a pull-up resistor connected to a data line of the USB and the pull-up resistor is connected to the second switch. The second switch cuts off the connection between the pull-up resistor and the data line if the power supply through the power line is cut off, and makes the connection between the pull-up resistor and the data line if the power supply is restarted.