Patent ID: 11927645
Assignee: INFINEON TECHNOLOGIES AG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. The capacitive sensor of claim 1, wherein:
the diagnostic circuit comprises a comparator and a fault detector,
the comparator is configured to receive an output voltage representative of the first voltage transient response, and compare the output voltage to a reference threshold in order to detect the first time constant, and
the fault detector is configured to compare the first time constant to a pull-in threshold value that corresponds to the pull-in capacitance,
when the first electrical signal is a pull-in signal, the fault detector is configured to generate a first error signal in response to the first time constant being less than the pull-in threshold value, and
when the first electrical signal is a non-pull-in signal, the fault detector is configured to generate a second error signal in response to the first time constant being equal to or greater than the pull-in threshold value.