An integrated circuit for a portable electronic device able to operate in an active mode or in an inactive mode and including a functional module implementing control functions of the device in the active mode and the inactive mode, controlling switching of the device to the active mode and including its own power supply unit, independent of power supply arrangements of the circuit in which it is integrated, which includes one or more devices for electrically isolating the module and its own power supply unit from the remainder of the integrated circuit.
