Sensor Arrangement and Method of Operating a Sensor Arrangement

A sensor arrangement comprising:

• a pressure sensor realized as a capacitive pressure sensor;
• a capacitance-to-digital converter;
• a test circuit;
• and
• a switching circuit coupling the capacitance-to-digital converter and the test circuit to the pressure sensor.

A method of operating a sensor arrangement, the method comprising

• coupling, in a measurement phase, a capacitance-to-digital converter to a pressure sensor via a switching circuit;
• and
• coupling, in a test phase, a test circuit to the pressure sensor or coupling the test circuit and the capacitance-to-digital converter to the pressure sensor via the switching circuit,
• wherein the pressure sensor is realized as a capacitive pressure sensor.

A sensor arrangement comprising:

• a pressure sensor that is realized as a capacitive pressure sensor;
• a capacitance-to-digital converter;
• a test circuit;
• a switching circuit comprising a first switch coupling the test circuit to the pressure sensor and a second switch coupling the capacitance-to-digital converter to the pressure sensor;
• a digital circuit coupled to the capacitance-to-digital converter, the test circuit and the switching circuit;
• and
• a memory connected to the digital circuit,
• wherein, in a test phase, the digital circuit is configured to:
• control the switching circuit such that the test circuit is coupled to the pressure sensor and the capacitance-to-digital converter is disconnected from the pressure sensor, and
• store correction data in the memory, and
• wherein, in a measurement phase, the digital circuit is configured to:
• control the switching circuit such that the capacitance-to-digital converter is coupled to the pressure sensor and the test circuit is not connected to the pressure sensor,
• provide a digitized pressure signal depending on a digital signal provided by the capacitance-to-digital converter and correction data stored in the memory.