Patent ID: 11953533
Assignee: CAPITAL ONE SERVICES, LLC
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. The capacitive sensor of claim 9, wherein:
the diagnostic circuit comprises a comparator, at least one counter, and a fault detector,
the comparator is configured to receive an output voltage representative of the first voltage transient response and the second voltage transient response, compare the output voltage to a first reference threshold in order to detect the first time constant, and compare the output voltage to a second reference threshold in order to detect the second time constant,
the at least one counter is configured to output a first counter value representative of the detected first time constant and output a second counter value representative of the detected second time constant, and
the fault detector is configured to calculate a difference between the first counter value and the second counter value, compare a magnitude of the difference to a predetermined threshold range, and generate an error signal in response to the magnitude of the difference being outside the predetermined threshold range.