Security circuit with magnetic proximity sensor having a magneti

Details Security circuit with magnetic proximity sensor having a magneti Security circuit with magnetic proximity sensor having a magneti

1994-01-24

1996-02-13

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

324235, 327511, 338 32H, G01R 3306, G01N 2772, H03K 1790, H03K 1918

Patent

active

054914124

ABSTRACT:
A security circuit includes a Hall-effect sensor for generating an output signal in response to a sensed variation in magnetic field strength. A supply voltage source is connected to the Hall-effect sensor. A latch circuit receives the Hall-effect sensor output signal and generates a latched output signal. The latch circuit operates between a set and a reset state. Circuitry is provided for monitoring the supply voltage source and for generating an output signal applied to the latch circuit. The latch circuit generates the latched output signal in response to the Hall-effect sensor output signal and the output signal generated by the monitoring circuit when the supply voltage is at a predetermined level. The latch circuit is reset when the supply voltage is below the predetermined level.

REFERENCES:
patent: 4987512 (1991-01-01), Mulshine

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