Identification of a peripheral connection state with a universal serial bus
AssigneeInfineon Technologies AG
InventorsJens Barrenscheen, Peter Schneider
Life of this patent
Estimating the term…
Abstract
A circuit configuration for a USB peripheral has an integrated circuit, which has two pins for connecting to two data transmission lines of a USB connection. A peripheral functional information resistor, which is specified as being essential in accordance with USB, is connected to one of the pins. The other pin is connected to the operating voltage via an electrically conductive component. The integrated circuit has an evaluation device, which identifies the USB connection state in dependence on the potential that is present on the other pin.
Claims13
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;
- and
- 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 USB connection is connected to the USB peripheral;
- 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.
An integrated circuit for a USB peripheral, the integrated circuit comprising:
- two pins, including a first pin and a second pin, for connecting to two data transmission lines of a USB connection, said second pin to be connected to an operating voltage through a peripheral functional information resistor of the USB peripheral, said peripheral functional information resistor being present as an essential feature as specified in accordance with USB specifications;
- and
- an evaluation device for identifying a USB connection state in dependence on an electrical potential present on said first pin, said evaluation device coupled to said first pin.
A method for determining, in an integrated circuit of a USB peripheral, whether the USB peripheral is or is not connected to a USB connection, the integrated circuit having two pins, including a first pin and a second pin, for connecting to two data transmission lines of the USB connection, which comprises the steps of:
- connecting the second pin to an operating voltage through a peripheral functional information resistor of the USB peripheral, the peripheral functional information resistor being specified as an essential feature in accordance with USB specifications;
- connecting the first pin one of permanently to the operating voltage and to the operating voltage at times via an electrically conductive component, and, upon connection of the electrically conductive component to the first pin, an electrical potential present on the first pin being dependent on whether or not the USB connection is connected to the USB peripheral;
- and
- evaluating the electrical potential present on the first pin in the integrated circuit to identify a USB connection state.
Dependencies are inferred from the claim text.