A sensor device includes a memory circuit and a transmission circuit. The transmission circuit sends a first data signal to an external receiver in a first state of a read-out-mode of the sensor device, if an oscillation period of the oscillating quantity is longer than a period threshold. Further, the transmission circuit sends a second data signal to the external receiver in a second state of the read-out-mode, if the oscillation period of the oscillating quantity is shorter than the period threshold. The second data signal contains information on at least one of a first local extremum sensor data value and a succeeding second local extremum sensor data value.