Methods and apparatus for sensor diagnostics including programmable self-test signals
First Claim
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1. An integrated circuit, comprising:
- a magnetic sensing element;
fault detection module coupled to the sensing element, the fault detection module including circuitry to detect a fault condition and to self-test operation of the circuitry for detecting the fault condition; and
a fault pin to indicate the fault condition, wherein the fault pin comprises an input/output pin such that pulling the fault pin to a given voltage level for a given time provides a self-test request to initiate the self-test operation, andwherein the fault detection module includes at least one switch to cycle through connections to known voltage and ground signals and verify expected fault and no fault signals on the fault pin for the self-test operation of the circuitry for detecting the fault condition.
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Abstract
Methods and apparatus to provide an integrated circuit having a magnetic sensing element and fault detection module coupled to the sensing element, the fault detection module including circuitry to detect a fault condition and to self-test operation of the circuitry for detecting the fault condition. In illustrative embodiments, a fault pin indicates the fault condition.
107 Citations
28 Claims
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1. An integrated circuit, comprising:
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a magnetic sensing element; fault detection module coupled to the sensing element, the fault detection module including circuitry to detect a fault condition and to self-test operation of the circuitry for detecting the fault condition; and a fault pin to indicate the fault condition, wherein the fault pin comprises an input/output pin such that pulling the fault pin to a given voltage level for a given time provides a self-test request to initiate the self-test operation, and wherein the fault detection module includes at least one switch to cycle through connections to known voltage and ground signals and verify expected fault and no fault signals on the fault pin for the self-test operation of the circuitry for detecting the fault condition. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, comprising:
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coupling a magnetic sensing element to fault detection module in an integrated circuit; providing the fault detection module to include circuitry to detect a fault condition and to self-test operation of the circuitry for detecting the fault condition; providing self-test signals; and providing a fault pin to indicate the fault condition, wherein the fault pin comprises an input/output pin such that pulling the fault pin to a given voltage level for a given time provides a self-test request to initiate the self-test operation, and wherein the fault detection module includes at least one switch to cycle through connections to known voltage and ground signals and verify expected fault and no fault signals on the fault pin for the self-test operation of the circuitry for detecting the fault condition. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An integrated circuit, comprising:
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a magnetic sensing element; fault detection module coupled to the sensing element, the fault detection module including circuitry to detect a fault condition and to self-test operation of the circuitry for detecting the fault condition, wherein the fault detection module includes a window comparator having at least one threshold associated with the fault condition; and a fault pin to indicate the fault condition, wherein the fault pin comprises an input/output pin such that pulling the fault pin to a given voltage level for a given time provides a self-test request to initiate the self-test operation, and wherein the fault detection module includes at least one switch to cycle through connections to known voltage and ground signals and verify expected fault and no fault signals on the fault pin for the self-test operation of the circuitry for detecting the fault condition.
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Specification