Unit for sensing physical quantity

Details Unit for sensing physical quantity Unit for sensing physical quantity

Filed on

2006-08-29

Date issued

2006-08-29

Examiner

Mullen, Thomas (Department: 2612)

Patent Class

Communications: electrical

SubClass

Condition responsive indicating system

SubSubClass

Specific condition

Other Related Categories

C340S661000, C340S663000, C340S636150

Type

Reexamination Certificate

Status

active

Patent number

07098799

Description

ABSTRACT:
A sensor unit sensing a physical quantity comprises a first voltage evaluation circuit, a second voltage evaluation circuit, an alarm signal output circuit, and a sensor output circuit. The first voltage evaluation circuit evaluates a power voltage by comparing it with a reference voltage and outputs an accident signal when the power voltage is lower than a first predetermined voltage. The second voltage evaluation circuit working in a lower voltage range in which the first voltage evaluation circuit is insensitive outputs the accident signal when the power voltage is lower than a second predetermined voltage. The alarm signal output circuit outputs an alarm signal in response to the accident signal. The sensor output circuit outputs a sensor signal and inhibits the circuit from outputting the sensor signal in response to the accident signal, so that the alarm signal output circuit provides the alarm signal in response to the accident signal.

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patent: 6401018 (2002-06-01), Oba et al.
patent: 2005/0174249 (2005-08-01), Weder
patent: 60-119470 (1985-06-01), None
patent: 61-191630 (1986-11-01), None
patent: 2001-183164 (2001-07-01), None

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