Interface circuit

Details Interface circuit Interface circuit

2003-09-17

2009-08-11

Lee, Thomas (Department: 2116)

Electrical computers and digital processing systems: support

Computer power control

Power conservation

C713S320000, C713S600000, C713S601000

Reexamination Certificate

active

07574618

ABSTRACT:
Noise removal and detection are performed for a signal VBUS in a detection portion in accordance with a low-frequency clock signal CLK generated by a CR oscillation circuit, and a detection signal VBD is received by a process control portion. A signal VBC detected by the detection portion is supplied to a quartz oscillation circuit as an operation-enable signal ENB. Thus, when a data transmission is designated by the signal VBUS, the quartz oscillation circuit supplies a high-frequency clock signal CK to a transmission function portion, enabling a data transmission. The operation-enable signal ENB is not supplied to the quartz oscillation circuit when data transmission is not performed. The power consumption of the CR oscillation circuit is small, so power consumption can be reduced.

REFERENCES:
patent: 5151613 (1992-09-01), Satou et al.
patent: 5621361 (1997-04-01), Adduci
patent: 6275087 (2001-08-01), Dehghan
patent: 6434704 (2002-08-01), Dean et al.
patent: 6467042 (2002-10-01), Wright et al.
patent: 6473477 (2002-10-01), Watanabe
patent: 6845454 (2005-01-01), Kim
patent: 2001-211276 (2001-08-01), None
patent: 2002-152439 (2002-05-01), None
“Introduction to USB On-The-Go”.

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