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US 7,733,155 B2Granted
Low power voltage detection circuit and method therefor
AssigneeSemiconductor Components Industries, LLC
InventorsFrantisek Sukup, Josef Halamik, Christophe Basso
Life of this patent
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Abstract
In one embodiment, a low power voltage detection circuit includes a first voltage detection device that receives power from an input voltage and a second voltage detection device receives power from an output of the low power voltage detection circuit.
Claims19
A low power under-voltage detection method comprising:
- coupling a first voltage detection circuit of an under-voltage detection circuit to continuously receive an input voltage, to decouple the input voltage from an output of the under-voltage detection circuit responsively to the input voltage being less than a first value and to couple the input voltage to the output of the under-voltage detection circuit as an output voltage responsively to the input voltage being no less than the first value;
- and
- coupling a second voltage detection circuit of the under-voltage detection circuit to receive a signal that is representative of the input voltage responsively to coupling the input voltage to the output, and to decouple the input voltage from the output responsively to the input voltage being less than a second value.
A low power voltage detection circuit comprising:
- a first voltage detection circuit coupled to continuously receive power from an input voltage and configured to form an enable signal responsively to a first threshold value of the input voltage;
- an output voltage controller coupled to receive the input voltage and form an output voltage on an output of the low power voltage detection circuit responsively to the enable signal;
- and
- a comparator circuit coupled to receive power from the output voltage controller and form a second threshold value, the comparator circuit coupled to disable the output voltage controller responsively to the input voltage being no greater than the second threshold value wherein the second threshold value is less than the first threshold value.
1 more element
A method of forming a low power voltage detection circuit comprising:
- coupling the low power voltage detection circuit to receive an input voltage and provide an output voltage to power other circuits coupled to an output of the low power voltage detection circuit;
- configuring the low power voltage detection circuit to detect the input voltage being less than a first threshold value and responsively inhibit supplying the output voltage;
- and
- configuring the low power voltage detection circuit to detect the input voltage being no less than the first threshold value and responsively supply the output voltage.
1 more element
Dependencies are inferred from the claim text.