Physical parameter sensor with self-diagnosis circuit

A physical parameter sensor that detects a physical parameter, said physical parameter sensor comprising:

• a sensor section that converts a physical parameter into an electric signal,
• a signal processing section that performs signal processing of the electric signal converted by said sensor section,
• an amplifier section that amplifies the signal processed by said signal processing section,
• a data storage section that stores, as a plurality of identical data words, digital data for adjusting the signal processing performed by said signal processing section and for adjusting said amplifier section,
• a majority-decision circuit section that performs a majority decision for each set of corresponding bits in the plurality of digital data words stored in said data storage section to output a digital data word generated by said majority-decision into said signal processing section and said amplifier section,
• a self-diagnosis circuit having,
• a judgment circuit section that detects whether the plurality of data words stored in said data storage section are identical or not by consecutively judging whether a corresponding bit of all stored data words are identical and outputs a result of judgment, and
• an error signal output section that generates an error signal if the result of judgment indicates all stored data words are not identical and outputs the error signal to an external control circuit to which an output of said amplifier section is input, thereby indicating a possibility of error generation in the output of said physical parameter sensor to said external control circuit.