Patent ID: 8373951
Filing Date: 2013-02-12
Classification: G06F,H01L

Abstract:
1. A universal serial bus (USB) protection circuit, the circuit comprising: a V+ line configured to be connected to a V+ connection of a USB cable; a ground line configured to be connected to a ground connection of the USB cable; a D+ line configured to be connected to a D+ connection of the USB cable; a D− line configured to be connected to a D− connection of the USB cable; a first resettable device coupled to the V+ line and linking the V+ line to a V+ of a local device; a second resettable device coupled to the ground line and linking the ground line to a common node of the local device; a windowing comparator having a negative input coupled to the common node and a positive input coupled to the ground line; a first switch coupled between the D+ line and a D+ of the local device, the first switch driven by an output of the comparator; and a second switch coupled between the D− line and a D− of the local device, the second switch driven by the output of the comparator.