Power supply voltage detection circuit
AssigneeNEC Electronics Corporation
InventorYuji FUJITA
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Abstract
A power supply voltage detection circuit of the present invention includes a reference signal generation circuit that generates a reference signal according to a power supply voltage, a first transistor having a current flowing between a first terminal and a second terminal, where the current is controlled according to the reference signal, a voltage generation circuit that generates a control voltage according to a potential difference between the power supply voltage and the first terminal of the first transistor, and a second transistor that controls whether or not to output the power supply voltage according to the control voltage. Such circuit configuration enables to accurately detect a low voltage state of the power supply voltage.
Claims12
A power supply voltage detection circuit comprising:
- a reference signal generation circuit that generates a reference signal according to a power supply voltage;
- a first transistor having a current flowing between a first terminal and a second terminal, the current being controlled according to the reference signal;
- a voltage generation circuit that generates a control voltage according to a potential difference between the power supply voltage and the first terminal of the first transistor;
- and
- a second transistor that controls whether or not to output the power supply voltage according to the control voltage.
Dependencies are inferred from the claim text.