Universal serial bus wakeup circuit

Details Universal serial bus wakeup circuit Universal serial bus wakeup circuit

2011-01-11

2011-01-11

Du, Thuan N (Department: 2116)

Electrical computers and digital processing systems: support

Computer power control

Power conservation

C713S324000, C713S340000

Reexamination Certificate

active

07870408

ABSTRACT:
A circuit is attached in parallel to a universal serial bus interface of a data processing system. A capacitor in the circuit 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 is unpowered while the data processing system is not in a reduced power state. The vibration sensor is disconnected from a data pin of the universal serial bus interface while the data processing system is not in a reduced power state. When the data processing system enters a reduced power state, the capacitor provides power to the vibration sensor. When a vibration is detected by the vibration sensor, a 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.

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patent: 2007/0130479 (2007-06-01), Price et al.

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