Microcontroller Startup Sequence Switching for Current-Limited Power
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Solution Overview
Problem
Semiconductor systems with microcontrollers that suppress instantaneous current face challenges in starting quickly when the power supply transitions from insufficient to sufficient current capability, leading to unstable operation and extended start times due to mismatched current consumption and supply capabilities.
Innovation Solution
A semiconductor device with a determination circuit, power control circuit, clock control circuit, and CPU that selects between normal and low-power-consumption start sequences based on voltage levels inputted to external terminals, allowing for instantaneous current suppression or high-speed operation depending on the power supply's current capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a microcontroller with suppressed instantaneous current is selected to match a power supply with insufficient current supply capability, then stable start operation is achieved, but the start time of the microcontroller is extended and performance is reduced
Solution Approach 1:
The microcontroller dynamically switches between two operational modes during the start sequence: a current-suppression mode for stable startup with insufficient power supply, and a high-speed mode when sufficient current is available. This dynamic adaptation resolves the contradiction by allowing the system to optimize for stability initially, then for speed later, based on real-time power supply conditions.
2Speed
If a performance-oriented microcontroller is mounted on a semiconductor system with insufficient current supply capability, then high-speed operation is achieved, but the current consumption exceeds the power supply capability during start sequence
Solution Approach 1:
The microcontroller performs preliminary current suppression during the critical startup phase before switching to high-speed operation. This preliminary action of limiting current consumption ensures that the power supply is not overloaded during the vulnerable start sequence, while still allowing high performance to be achieved later when the system is fully operational.
3Loss of time
If the start sequence is configured for high-speed operation, then the microcontroller starts quickly, but the instantaneous current exceeds the capability of power supplies with insufficient current supply capability
Solution Approach 1:
The microcontroller changes operational parameters during the start sequence by initially suppressing instantaneous current to match the power supply capability, then transitioning to high-current mode when appropriate. This parameter change allows the system to adapt to the power supply constraints during startup while still achieving high performance operation afterward.
Data Source
AI summary
A semiconductor device selects one start sequence of the normal start and the low-power-consumption start based on the determination result of the determination circuit. According to the configuration, the operation in the start sequence from the power supply input to the processor operation start can be selected from the operation in which the instantaneous current is suppressed and the high-speed operation based on the supplied power supply.