US Patent 9846471 Systems and methods for power management in devices

Systems and methods for conserving power in an apparatus are provided. A sensor of the apparatus is configured to detect an event comprising a device having a predetermined attribute entering into a designated region surrounding the apparatus. An integrated circuit (IC) of the apparatus operable in multiple power modes. The IC is configured to transition from a low-power standby mode to a high-power standby mode upon detection of the event by the sensor. The IC is further configured to transition from either the low-power standby mode or the high-power standby mode to an active mode upon occurrence of one of multiple wakeup events. The transition from the high-power standby mode to the active mode takes less time than the transition from the low-power standby mode to the active mode.