Identification of a peripheral connection state with a universal serial bus

Claim 1

A circuit configuration for a universal serial bus (USB) peripheral, the circuit configuration comprising: an operating voltage terminal providing an operating voltage; an integrated circuit having two pins, including a first pin and a second pin, for connecting to two data transmission lines of a USB connection; a peripheral functional information resistor connected between said second pin and said operating voltage terminal, said peripheral functional information resistor being present as an essential feature as specified in accordance with USB specifications; an electrically conductive component connected or connectable between said first pin and said operating voltage terminal, upon connection of said electrically conductive component to said first pin, an electrical potential impressed on said first pin being dependent on whether or not the USE connection is connected to the USB peripheral; and a changeover switch connected between said first pin, said second pin, said peripheral functional information resistor and said electrically conductive component, using said changeover switch said peripheral functional information resistor can be disconnected from said second pin and connected to said first pin, and using said changeover switch said electrically conductive component can be disconnected from said first pin and connected to said second pin; said integrated circuit having an evaluation device coupled to said first pin for identifying a USB connection state in dependence on the electrical potential present on said first pin.