Motion Sensor Hibernation Wakeup Control
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Solution Overview
Problem
Mobile devices face challenges in extending battery life during idle periods, as existing power management systems that reduce power consumption, such as hibernate modes, often result in longer wake-up times, impacting user experience.
Innovation Solution
Implementing a hibernate mode that powers down the PMIC and processor while maintaining low power to sensors and a low power boot control circuit, allowing for quick boot and minimal delay when the device is reactivated, using sensors like hall sensors and motion detectors to manage transitions between modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the device enters hibernate mode to reduce power consumption, then battery life is extended, but wake-up time increases
Solution Approach 1:
The system segments the power management into multiple operational states: full hibernate mode where most components are powered down, and a partial wake state where the sensor controller and motion sensor remain active while the processor stays dormant. This segmentation allows the device to maintain ultra-low power consumption during idle periods while enabling rapid wake-up when motion is detected, resolving the contradiction between extended battery life and quick responsiveness.
Solution Approach 2:
The sensor controller and motion sensor are kept in a low-power ready state before actual wake-up is needed. This preliminary action allows the system to detect motion events immediately without requiring full processor activation, thereby reducing wake-up time while maintaining hibernate-level power savings during extended idle periods.
2Use of energy by moving object
If the processor and PMIC are powered down in hibernate mode, then power consumption decreases, but device responsiveness increases
Solution Approach 1:
The sensor controller acts as an intermediary between the motion sensor and the processor. When motion is detected, the sensor controller generates a wake-up signal that triggers processor activation without requiring the processor to continuously monitor for wake events. This intermediary mechanism enables the processor to remain completely powered down during hibernate while maintaining system responsiveness through the lower-power sensor controller.
3Loss of time
If sensors remain powered during hibernate mode, then wake-up time is reduced, but power consumption increases
Solution Approach 1:
The system applies local quality by differentiating power states across different components: the processor and PMIC enter full hibernate with minimal power consumption, while the sensor controller and motion sensor operate in a light sleep mode with slightly higher but still reduced power consumption. This localized quality approach allows selective maintenance of wake-up capability in only the necessary subsystems, minimizing overall power impact while achieving fast wake-up response.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly extends device usage time per battery charge without increasing wake-up times, providing a better user experience by allowing devices to resume operation quickly and efficiently.
Implementation Method 1
a motion sensor, such as an accelerometer, of the device may be in communication with a low power boot control circuit
Implementation Method 2
the cover sensor may include a hall sensor that may detect closing of the cover and in response send an interrupt signal to a processor on the device
Data Source
AI summary
A processor configured to reduce the amount of time necessary for a mobile device to resume from a hibernation state is described. While in the hibernation state, power to all components of a mobile, except a motion sensor, may be powered off. The processor, upon receiving a signal from a wakeup sensor, causes the mobile device to initiate a transition from the hibernation mode to an awake mode. A validation sensor on the mobile device detects a user contact with the mobile device or user proximity with respect to the mobile device. Upon receiving a validation signal confirming validation of the transition from the hibernation state to the awake state, the processor resumes the transition to the awake mode. In the awake mode the mobile device may detect user input indicative of activating the mobile device. Upon receiving a signal indicating user input to activate the device, the processor may cause the device to become fully active, and ready for user interaction.