Abstract: A circuit arrangement is disclosed comprising a transmitter/receiver unit (1), a control circuit (2) and a supply line (3). The transmitter/receiver unit (1) comprises a supply input (4) for connecting the supply line, an energy storage unit (5) that with a first connection is coupled to the supply input (4) and that is configured to guarantee an internal energy supply during a reduction of an average supply signal (VS) at the supply input (4) over a predetermined time period, a detection unit (6) that is coupled to the supply input (4) and that is configured to detect a reduction of the average supply signal (VS) over the predetermined time period and at which an evaluation signal (AS) can be tapped, and a data transmission unit (7) that is coupled to the detection unit (6) and to the supply input (4) and that is configured to send a data signal (SD) via the supply line, depending on the evaluation signal (AS).

Abstract: A semiconductor body (1) comprises a first contact pad (2), a second contact pad (3), an integrated circuit (5) and an impedance (4). The integrated circuit (5) comprises a first terminal (6) which is coupled to the first contact pad (2) and a second terminal (7) which is coupled to the second contact pad (3). The impedance (4) additionally couples the first contact pad (2) to the second contact pad (3).

Abstract: A control circuit for control of light-emitting diodes has a first LED string (50) with at least one LED (51, 52, 53) and a first supply device (1) for supply of current to the first LED string (50). The supply device (1) has a control input (10) for delivery of a first control signal (CTL) and is provided for delivery, as desired, of a first supply current (IV1) or a second supply current (IV2) in dependence on the first control signal (CTL). The first and the second control currents (IV1, IV2) are non-zero.