An electronic device for an automotive lighting device, including a driver and a mixer. The driver includes a power and signal input and has a supply voltage threshold, in such a way that the microcontroller is configured to reset if the voltage value in the power and signal input is lower than the supply voltage threshold. The mixer includes an output connected to the power and signal input of the driver, and is configured to provide an output signal which is related to the highest between the non-permanent signal and the permanent signal inputs.