Circuit for generating dying gasp signals and electronic...

Details Circuit for generating dying gasp signals and electronic... Circuit for generating dying gasp signals and electronic...

2005-12-30

2009-08-11

Payne, David C (Department: 2611)

Pulse or digital communications

Cable systems and components

C375S222000

Reexamination Certificate

active

07573941

ABSTRACT:
An exemplary circuit for generating dying gasp signals (30) includes a power loss detecting circuit (320), a Digital Signal Processor (DSP) (310), a unipolar switch circuit (330), and a capacitor (C1). The power loss detecting circuit is used for detecting power loss statuses and generating interrupt signals, and includes a first input end. The DSP is connected to the power loss detecting circuit, and is used for generating dying gasp signals according to the interrupt signals. The unipolar switch circuit includes a second input end connected to the first input of the power loss detecting circuit, and a first output end connected to the DSP. The capacitor includes one end connected to the first output end of the unipolar switch circuit, and another end connected to ground.

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