Abstract: A device includes a logic circuit having first, second, and third input ports, a first output port, and a feedback path between the first output port and the third input port. In a first operating state, a logic state change at the first input port triggers a logic state change at the first output port, but a logic state change at the third input port does not trigger a logic state change at the first output port. This allows signals to be routed through the device. In a second operating state, a logic state change of the third input port triggers a logic state change of the first output port. This change is fed back, delayed by a time value, to the third input to maintain an oscillation with at least two edges. The frequency of this oscillation is used to determine a value of a measurement variable.

Abstract: A device for detecting an approach or a touch related to at least one sensor element, in particular in an electrical appliance, the device comprising an input side and an output side, between which a first signal path with a first input and a first output and a second signal path with a second input and a second output are arranged, wherein the first signal path comprises a delay device with a delay, the delay device configured to delay a digital first input signal at the first input into a digital first output signal at the first output, wherein the delay is dependent on a capacitance value resulting from the approach or the touch related to the sensor element, and wherein the second signal path comprises an XOR-element, which is configured to generate an edge in a digital second output signal at the second output, when the digital first output signal outputted by the delay device exhibits an edge.