Microcontroller Stand-By Wake-Up Circuit With Delayed Signal Intercept
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Solution Overview
Problem
Existing microcontroller stand-by mode technologies face challenges in minimizing residual power consumption and ensuring predictable wake-up from stand-by periods due to the need for continuous power supply monitoring, which leads to unpredictable system starting and high power consumption.
Innovation Solution
Incorporating a stop/start circuit that allows the power supply monitoring block to be turned off during stand-by periods, using a logic function and signal intercepting circuit to delay and manage wake-up signals, thereby reducing power consumption and preventing undetermined states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply monitoring block remains active during stand-by periods to detect wake-up signals, then the system can wake up from stand-by mode, but the residual power consumption increases
Solution Approach 1:
The patent extracts the power supply monitoring block from the active state during stand-by periods, turning it off to minimize power consumption. The wake-up functionality is maintained through a simplified mechanism using a stop/start circuit and logic function that can detect external signals without requiring the full monitoring block to remain active.
Solution Approach 2:
The system is segmented into different functional blocks with different power management strategies. The power supply monitoring block is separated from the core logic and can be independently controlled. During stand-by, only essential components (logic function and stop/start circuit) remain active while the monitoring block is powered down.
2Use of energy by moving object
If the power supply monitoring block is turned off during stand-by periods, then the residual power consumption decreases, but the system cannot reliably detect wake-up signals
Solution Approach 1:
The patent introduces a stop/start circuit and logic function as intermediary components that bridge the gap between the powered-down monitoring block and the external wake-up signals. These intermediaries can detect external signals during stand-by and trigger the monitoring block only when needed, ensuring reliable wake-up detection while maintaining low power consumption.
Solution Approach 2:
The stop/start circuit and logic function perform preliminary detection of wake-up signals before activating the full power supply monitoring block. This preliminary action allows the system to respond to external signals reliably while keeping the power consumption minimal during the stand-by period.
3Reliability
If the power supply monitoring block continuously monitors inputs-outputs, then the system can detect wake-up needs, but the system starting becomes unpredictable
Solution Approach 1:
Instead of continuous monitoring, the system uses periodic or event-driven action. The power supply monitoring block is activated only when needed (when the logic function detects an external signal), rather than continuously monitoring during the entire stand-by period. This periodic activation ensures reliable wake-up detection while maintaining predictable system behavior.
Data Source
AI summary
A microcontroller includes a core and a unit for managing the power supply of the core that includes an input for receiving an external signal indicating a leaving of a stand-by mode of operation. A signal intercepting unit intercepts the external signal and transmitting it with a delay to the unit for managing.