Sensor arrangement and method of operating a sensor arrangement

A method for operating a sensor arrangement, wherein the sensor arrangement comprises a pressure sensor, a capacitance-to-digital converter, a reference voltage generator and a digital circuit wherein an output of the reference voltage generator is connected to an input of the capacitance-to-digital converter, and wherein the digital circuit is coupled to the capacitance-to-digital converter and the reference voltage generator, the method comprising:

• receiving, at a control input of the reference voltage generator, a control signal from the digital circuit;
• providing, at the output of the reference voltage generator, a reference voltage having a value as a function of the control signal;
• and
• measuring, by the capacitance-to-digital converter, a capacitance of the pressure sensor as a function of the reference voltage provided to the pressure sensor by the capacitance-to-digital converter,
• consecutively providing, by the capacitance-to-digital converter, in a test phase, at least two different values of the reference voltage which have the same sign and different amounts to the pressure sensor;
• generating, by the capacitance-to-digital converter, in the test phase, at least two values of a digital signal depending on a capacitance value of the pressure sensor;
• and
• generating by the digital circuit, in the test phase, a parameter and/or correction data depending on the at least two values of the digital signal and the values of the reference voltage,
• wherein the pressure sensor is a capacitive pressure sensor, and
• wherein the capacitance-to-digital converter is a delta-sigma analog-to-digital converter.