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US 4,258,310 AGranted
Selectively adjustable voltage detection integrated circuit
AssigneeKabushiki Kaisha Suwa Seikosha
InventorsTatsushi Asakawa, Shinji Morozumi
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AssigneeKabushiki Kaisha Suwa Seikosha
InventorsTatsushi Asakawa, Shinji Morozumi
Estimating the term…
A voltage detection integrated circuit including a voltage regulation circuit for controlling the operation thereof is provided. The voltage detection integrated circuit includes a reference voltage circuit for producing a predetermined reference voltage, a voltage converter for converting a detected voltage for measurement and a comparator circuit for comparing the level of the reference voltage to the level of the converted voltage and for producing a comparison signal representative of the difference in voltage levels compared thereby. The voltage regulation circuit is coupled to the comparator circuit and the reference voltage circuit and/or voltage conversion circuit for selectively adjusting the level of the reference voltage produced by the reference voltage circuit and/or the converted voltage produced by the voltage converter, to thereby control the comparison signal produced by the comparator circuit.
A voltage detection circuit for use with a voltage source adapted to deliver a source voltage comprising in combination reference voltage means for producing a set reference voltage, voltage converter means for producing a converted voltage representative of the source voltage delivered by said voltage source, comparator means for receiving said set reference voltage and said converted voltage, and for providing a comparison signal in response thereto, and regulation circuit means intermediate one of said reference voltage means and converter means and comparator means for selectively varying one of said set voltage and converted voltage to be applied to said comparator means each of said regulation circuit means, reference voltage means, voltage converter means and comparator means being comprised of integrated circuit elements that are fabricated into the same circuit chip.
A voltage detection circuit comprising a voltage source, said voltage source being adapted to deliver a source voltage, a circuit means for producing an output voltage that is independent of variations in temperature and variations in the source voltage, said circuit means including two like polarity MOS transistors having distinct threshold voltages, said output voltage produced by said circuit means being integrally related to the difference in the threshold voltages of said like polarity MOS transistors, said circuit means defining a reference voltage means for producing a set reference output voltage, voltage converter means for producing a voltage representative of the source voltage delivered by said voltage source, comparator means for receiving said set reference output voltage and said converted voltage and for providing a comparison signal in response thereto, and pulse generating means for coincidentally applying differential sampling pulses having a predetermined time interval to said reference voltage means, voltage converter means and comparator means for selectively energizing each of said reference voltage means, voltage converter means and comparator means for said predetermined time interval that said sampling pulses are applied thereto.
Dependencies are inferred from the claim text.