Patent ID: 7870408
Filing Date: 2011-01-11
Classification: H03K

Abstract:
1. A circuit comprising: a capacitor, wherein the capacitor is charged by receiving power from a power pin of the universal serial bus interface while the data processing system is not in a reduced power state; a vibration sensor, wherein the vibration sensor does not receive power while the data processing system is not in the reduced power state, and wherein the vibration sensor is disconnected from a data pin of the universal serial bus interface while the data processing system is not in the reduced power state, wherein the capacitor provides power to the vibration sensor while the data processing system is in the reduced power state; a switch, wherein responsive to a vibration detection from the vibration sensor while the data processing system is in the reduced power state, the switch connects the vibration sensor to the data pin of the universal serial bus interface, providing a wake up signal to the data processing system.