Method for operating a backup circuit and circuit therefor
AssigneeSemiconductor Components Industries, LLC
InventorSusumu Yamada
Life of this patent
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Abstract
In some embodiments, a reset circuit for an electronic circuit equipped with a backup power capacitor includes a first detector arranged to detect a predetermined first voltage of the backup capacitor, a second detector arranged to detect a predetermined second voltage of the backup capacitor, the second voltage being lower than the first voltage, and a controller arranged to control an output of a reset request signal based on detection results of the first detector and the second detector. The controller is configured to output the reset request signal when the first detector detects the first voltage after the second detector detected the second detector.
Claims13
A method for operating a circuit, comprising:
- providing a first voltage from a first energy storage element in response to a main power supply becoming inactive, the first voltage at a first voltage level;
- generating a first detection signal in response to the first voltage reaching a second voltage level;
- generating a second detection signal in response to the first voltage reaching a third voltage level;
- and
- generating a control signal in response to the first voltage reaching a fourth level.
A method for resetting a circuit, comprising:
- providing a circuit coupled for receiving an input voltage, the circuit including a voltage supply element configured to supply an operating voltage in response to loss of the input voltage;
- generating a first detection voltage signal in response to the operating voltage decreasing from a first level to a second level;
- generating a second detection voltage signal in response to the operating voltage decreasing from the second level to a third level;
- and
- generating a first control signal in response to the operating voltage increasing to a fourth level.
Dependencies are inferred from the claim text.