Robert Boschgmbh

David John Vetter

Frank E Anderson

A universal serial bus (USB) protection circuit. The circuit includes a V+ line, a ground line, a D+ line, a D&#x2212; line, a first resettable device, a second resettable device, a windowing comparator, a first switch, and a second switch. The V+ line is configured to be connected to a V+ connection of a USB cable. The ground line is configured to be connected to a ground connection of the USB cable. The D+ line is configured to be connected to a D+ connection of the USB cable. The D&#x2212; line is configured to be connected to a D&#x2212; connection of the USB cable. The first resettable device is coupled to the V+ line and links the V+ line to a V+ of a local device. The second resettable device is coupled to the ground line and links the ground line to a common node of the local device. The windowing comparator has a negative input coupled to the common node and a positive input coupled to the ground line. The first switch is coupled between the D+ line and a D+ of the local device, and is driven by an output of the comparator. The second switch is coupled between the D&#x2212; line and a D&#x2212; of the local device, and is driven by the output of the comparator.

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Goleta, CA, United States of America

David John Vetter