USB KEY DEVICE AND METHOD FOR REALIZING INTELLIGENT CARD COMMUNICATION USING USB INTERFACE

摘要

A USB key device and method for realizing the intelligent card communication using the USB interface are provided. The USB key device includes: a USB interface (1), which is electrically connected with a safety chip (4) via a USB interface circuit (2) and an IO interface circuit (3) respectively; a clock (7) and a clock frequency setting unit (6), which are electrically connected with the security chip (4); in which the pin D+ of the USB interface (1) is electrically connected with the pin D+ of the USB interface circuit (2), the pin D− of the USB interface (1) is electrically connected with the pin D− of the USB interface circuit (2); the IO interface circuit (3) comprising a bilateral interface and an input interface; in which the pin D+ of the USB interface (1) is electrically connected with one of the interfaces of the IO interface circuit (3), and the pin D− of the USB interface (1) is electrically connected with another interface of the IO interface circuit (3) except the connected pin; an interface processing unit (5), which is used for setting the bilateral interface of the IO interface circuit (3) on input mode, judging the level of the bilateral interface, and turning on or off the USB interface circuit (2) according to the level of the bilateral interface.