Systems and methods for internal and external error detection in sensor output interfaces
First Claim
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1. An integrated circuit system comprising:
- at least one on-board diagnostic circuit comprising a switch coupled between an output and a first potential;
an output driver configured to provide a system output signal at the output; and
a control unit coupled to the at least one on-board diagnostic circuit and configured to compare the system output signal with a value and to provide an error output signal via the at least one on-board diagnostic circuit when the comparison indicates an error.
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Abstract
Integrated circuit systems, such as sensor systems, having on-board-diagnostic (OBD) circuits for the detection of errors presenting internal to the systems are disclosed, along with related methods. In one embodiment, an ADC multiplexer receives analog output readback from an output driver and provides a signal triggering an OBD circuit for internal error indication performed completely independent of digital-to-analog converters (DAC) and output drivers, which can be the point of failure.
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Citations
20 Claims
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1. An integrated circuit system comprising:
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at least one on-board diagnostic circuit comprising a switch coupled between an output and a first potential; an output driver configured to provide a system output signal at the output; and a control unit coupled to the at least one on-board diagnostic circuit and configured to compare the system output signal with a value and to provide an error output signal via the at least one on-board diagnostic circuit when the comparison indicates an error. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of detecting errors internal to an integrated circuit system comprising:
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providing an output signal of the system to an internal control circuit of the system; comparing the output signal to a value; and providing an error signal indicative of an error internal to the system via an on-board-diagnostic circuit if the comparing deviates from the value by a predefined limit, wherein providing the error signal further comprises deactivating a charge pump of the on-board-diagnostic circuit to close a switch of the on-board-diagnostic circuit to provide the error signal indicative of an error internal to the system via the closed switch. - View Dependent Claims (19, 20)
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Specification