Patent ID: 7383449

Claim:
An electronic device comprising at least two power management circuits and a signal line connecting said at least two power management circuits; wherein each of said at least two power management circuits is adapted to control a power supply to at least one functional component of said electronic device associated to said power management circuit; wherein each of said at least two power management circuits is adapted to detect at least one of a condition which allows a change of a powering state of said at least one functional component associated to said power management circuit and a condition which requires a change of a powering state of said at least one functional component associated to said power management circuit; wherein each of said at least two power management circuits is adapted to contribute to a change of a state of said signal line, in case said power management circuit detects a condition which allows or requires, respectively, a change of a powering state of said at least one functional component associated to said power management circuit; wherein each of said at least two power management circuits is adapted to monitor a state of said signal line, wherein each of said at least two power management circuits is adapted to change a powering state of all functional components associated to it upon detection of a change of state of said signal line, and wherein a condition which allows a change of a powering state of said at least one functional component associated to a power management circuit comprises a condition which allows powering up said at least one functional component, and wherein said at least two power management circuits are adapted to change a state of said signal line to cause said at least two power management circuits to power up their associated functional components, in case each of said at least two power management circuits detects a condition which allows powering up associated functional components.