VOLTAGE MONITORING CIRCUIT AND SEMICONDUCTOR DEVICE
First Claim
1. A voltage monitoring circuit that detects a presence or absence of a specification violation of a voltage to be monitored by comparing the voltage to be monitored with a first determination threshold voltage and can output a detection result indicating that there is a specification violation in response to a request when a self-diagnosis is performed, the voltage monitoring circuit comprising:
- a selection circuit that selects any one of the first determination threshold voltage, a second determination threshold voltage that is a voltage having a polarity reverse to that of the first determination threshold voltage with reference to the voltage to be monitored, and a third determination threshold voltage that is a voltage having the same polarity as that of the first determination threshold voltage with reference to the voltage to be monitored and has a potential difference larger than that of the first determination threshold voltage; and
a comparison circuit that detects the presence or absence of the specification violation by comparing a selected voltage selected by the selection circuit and the voltage to be monitored,wherein when the self-diagnosis is performed, the selection circuit defines the first determination threshold voltage as an initial state and sequentially selects the second determination threshold voltage, the third determination threshold voltage, and the first determination threshold voltage.
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Accused Products
Abstract
A voltage monitoring circuit and a semiconductor device that can reduce time required for self-diagnosis are provided. A selection circuit selects one of a determination threshold voltage for normal use, a determination threshold voltage for self-diagnosis, and a determination threshold voltage for boost having a potential difference larger than that of the determination threshold voltage for normal use. A comparison circuit detects a presence or absence of a specification violation of the voltage to be monitored by comparing a selected voltage selected by the selection circuit and the voltage to be monitored. Here, the selection circuit forcibly outputs a detection result indicating that there is a specification violation by defining the determination threshold voltage for normal use as an initial state and sequentially selecting the determination threshold voltage for self-diagnosis, the determination threshold voltage for boost, and the determination threshold voltage for normal use when the self-diagnosis is performed.
16 Citations
20 Claims
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1. A voltage monitoring circuit that detects a presence or absence of a specification violation of a voltage to be monitored by comparing the voltage to be monitored with a first determination threshold voltage and can output a detection result indicating that there is a specification violation in response to a request when a self-diagnosis is performed, the voltage monitoring circuit comprising:
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a selection circuit that selects any one of the first determination threshold voltage, a second determination threshold voltage that is a voltage having a polarity reverse to that of the first determination threshold voltage with reference to the voltage to be monitored, and a third determination threshold voltage that is a voltage having the same polarity as that of the first determination threshold voltage with reference to the voltage to be monitored and has a potential difference larger than that of the first determination threshold voltage; and a comparison circuit that detects the presence or absence of the specification violation by comparing a selected voltage selected by the selection circuit and the voltage to be monitored, wherein when the self-diagnosis is performed, the selection circuit defines the first determination threshold voltage as an initial state and sequentially selects the second determination threshold voltage, the third determination threshold voltage, and the first determination threshold voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A voltage monitoring circuit that detects a presence or absence of a specification violation of a voltage to be monitored by comparing the voltage to be monitored with a determination threshold voltage and can output a detection result indicating that there is a specification violation in response to a request when a self-diagnosis is performed, the voltage monitoring circuit comprising:
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a resistance element that generates a first voltage to be monitored, a second voltage to be monitored, and a third voltage to be monitored by resistance-dividing the voltage to be monitored; a selection circuit that selects any one of the first voltage to be monitored, the second voltage to be monitored, and the third voltage to be monitored; and a comparison circuit that detects the presence or absence of the specification violation by comparing a selected voltage selected by the selection circuit and the determination threshold voltage, wherein when the self-diagnosis is performed, the selection circuit defines the first voltage to be monitored an initial state and sequentially selects the second voltage to be monitored, the third voltage to be monitored, and the first voltage to be monitored, wherein the second voltage to be monitored is a voltage having a polarity reverse to that of the first voltage to be monitored with reference to the determination threshold voltage, and wherein the third voltage to be monitored is a voltage having the same polarity as that of the first voltage to be monitored with reference to the determination threshold voltage and has a potential difference larger than that of the first voltage to be monitored. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A semiconductor device composed of one semiconductor chip, the semiconductor device comprising:
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a voltage monitoring circuit that detects a presence or absence of a specification violation of a voltage to be monitored by comparing the voltage to be monitored with a first determination threshold voltage and can output a detection result indicating that there is a specification violation in response to a request when a self-diagnosis is performed; a self-diagnosis control circuit that controls the voltage monitoring circuit; and a reference voltage generation circuit that generates the first determination threshold voltage, a second determination threshold voltage that is a voltage having a polarity reverse to that of the first determination threshold voltage with reference to the voltage to be monitored, and a third determination threshold voltage that is a voltage having the same polarity as that of the first determination threshold voltage with reference to the voltage to be monitored and has a potential difference larger than that of the first determination threshold voltage, wherein the voltage monitoring circuit includes a selection circuit that selects any one of the first determination threshold voltage, the second determination threshold voltage, and the third determination threshold voltage, and a comparison circuit that detects the presence or absence of the specification violation by comparing a selected voltage selected by the selection circuit and the voltage to be monitored, and wherein the self-diagnosis control circuit controls the selection circuit when the self-diagnosis is performed and thereby causes the selection circuit to define the first determination threshold voltage as an initial state and sequentially select the second determination threshold voltage, the third determination threshold voltage, and the first determination threshold voltage. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification