Circuit and method for controlling an alarm
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United States of America Patent
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Feb 12, 2002
Grant Date -
N/A
app pub date -
Dec 20, 1999
filing date -
Dec 20, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
An alarm circuit (10) includes a sensor (11), a comparator (13), a control circuit (16), and a transducer (19). The control circuit (16) controls the transducer (19) and has three modes of operation: standby mode, alarm mode, and silence mode. The comparator (13) compares the voltage of an input signal from the sensor (11) to a first threshold level during the standby mode of operation. The control circuit (16) enables the transducer (19) and transitions to the alarm mode of operation after the voltage of the input signal exceeds the first threshold level. The control circuit (16) disables the transducer (19) for a predetermined time period and transitions to the silence mode of operation after a silence signal is received by the control circuit (16). The input signal is compared to both the first threshold level and a second threshold level during the silence mode. The silence mode can be terminated if the voltage of the input signal falls below the first threshold level or if the voltage of the input signal rises above the second threshold level. In addition, the silence mode can be terminated if the control circuit (16) receives a reset signal or a remote signal from a remote unit.
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