PMIC Power-Cut Reset Circuit for Manual Portable Terminal Recovery
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Solution Overview
Problem
Conventional portable terminals lack a manual reset function, making it difficult for users to perform a reset operation, especially when errors occur, as the reset function is often hardware-dependent and not user-controllable.
Innovation Solution
A reset circuit and method are introduced that include an input unit for generating a user-input signal, a reset unit to control power supply to the Power Management IC (PMIC), and a power supply unit to cut off and resupply power, enabling a manual reset function without requiring specific hardware attachments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manual reset function is added to portable terminals with PMIC that do not support it, then user control over reset operations is improved, but device complexity increases due to additional reset circuit components
Solution Approach 1:
The reset circuit is nested within the existing PMIC structure, utilizing the PMIC's internal resources and integration capabilities. The reset circuit components are embedded in the power management pathway, allowing the reset function to be added without requiring separate external circuitry, thus minimizing overall device complexity while enabling user-controlled reset operations
Solution Approach 2:
The reset circuit is designed to work universally with existing PMIC architectures, using standard power management components and control signals that can be integrated into various portable terminal designs. The circuit accepts user input through existing input mechanisms and produces reset signals compatible with different PMIC types, making the solution broadly applicable without requiring device-specific customizations
2Reliability
If power supply control circuitry is added to enable manual reset, then reset functionality is improved, but manufacturing complexity increases
Solution Approach 1:
The reset control circuitry is merged with the existing power supply control pathways in the PMIC. The same control switches and power management integrated circuits that regulate normal power distribution are also utilized to control reset signal generation and delivery. This consolidation allows the reset function to be manufactured using the same production lines and assembly processes as the base PMIC, avoiding the need for separate manufacturing steps
Solution Approach 2:
The reset circuit is designed to automatically generate and deliver reset signals to the processor using the existing power management infrastructure. The control switches and power supply unit work together autonomously based on user input signals, eliminating the need for complex external control mechanisms or additional manufacturing steps to integrate separate reset control systems
3Measurement precision
If a reset circuit with multiple control switches is implemented, then reset control precision is improved, but device complexity increases
Solution Approach 1:
The reset control function is segmented into distinct control switches (first control switch and second control switch) that independently manage different aspects of power supply control. The first control switch manages the primary power path while the second control switch manages the reset signal path. This segmentation allows precise control over the reset sequence and timing without requiring a single complex control mechanism, as each switch handles a specific control function with simple binary states
Data Source
AI summary
A reset circuit and a reset method of a portable terminal are provided. The reset circuit of a portable terminal includes an input unit for generating a certain input signal for reset according to a user input, a reset unit for generating a manual reset input signal according to an input of the certain input signal, for performing a control operation to cut-off power to be supplied to a Power Management IC (PMIC) using a signal generated during an operation maintenance time interval of the portable terminal and the manual reset input signal, and for performing a control operation to resupply the power to the PMIC according to an input signal from the input unit or completion of a preset timer, and a power supply unit for supplying the power.