Stylus Reset Circuit for PMIC Crash Recovery
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Solution Overview
Problem
Existing styluses are prone to failure due to crashes in their electronic circuits, and they lack an automatic reset mechanism, requiring users to perform a deep hard reset by powering off the system or PMIC.
Innovation Solution
A stylus design that includes a charging circuit, a battery, a power management integrated circuit (PMIC), and a reset circuit, where the reset circuit disconnects and reconnects paths between the charging port, battery, and PMIC to enable automatic resetting by controlling power flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complete set of small-system electronic circuits is provided inside the stylus, then the stylus can implement intelligent interaction functions, but the stylus is prone to crash and failure
Solution Approach 1:
The reset circuit is configured to automatically detect crashes and perform reset operations without user intervention. The circuit monitors the power management integrated circuit and automatically resets it when a crash is detected, enabling the stylus to self-correct failures and maintain continuous operation.
2Extent of automation
If a reset program is installed in the stylus for resetting, then automatic reset is enabled, but if the reset program becomes faulty or internal firmware of PMIC becomes abnormal, the stylus fails to be reset automatically
Solution Approach 1:
The reset function is extracted from the power management integrated circuit and implemented as a separate, independent reset circuit. This independent circuit uses a dedicated reset switch and control logic that operates independently of the PMIC firmware, ensuring that reset functionality remains reliable even when PMIC firmware becomes abnormal.
Solution Approach 2:
The reset circuit acts as an intermediary between the power source and the power management integrated circuit. It includes a reset switch that can independently control the power supply to the PMIC, allowing the reset function to operate independently of the PMIC's internal firmware state.
3Reliability
If a deep hard reset is required to resolve stylus failure, then the stylus can be restored to normal operation, but the user needs to power off the system or PMIC manually
Solution Approach 1:
The reset circuit automatically detects when the power management integrated circuit has crashed and performs the reset operation without requiring user intervention. The circuit monitors system state and autonomously executes the deep hard reset sequence by controlling the reset switch, eliminating the need for users to manually power off the system.
4Extent of automation
If the reset circuit disconnects and reconnects power paths automatically, then the stylus can reset itself, but the circuit complexity increases
Solution Approach 1:
The power management system is segmented into distinct functional blocks: a power management integrated circuit, an independent reset circuit, and a reset switch. This segmentation allows the reset function to be implemented as a simple, dedicated circuit module that independently controls power paths without complicating the overall system architecture.
Data Source
AI summary
A stylus includes a charging circuit, a battery, a power management integrated circuit, and a reset circuit. A charging port of the charging circuit and the battery are electrically connected to the power management integrated circuit through the reset circuit. The reset circuit is configured to: disconnect a path between the charging port and the power management integrated circuit and disconnect a path between the battery and the power management integrated circuit when the charging port is powered on, and connect the path between the charging port and the power management integrated circuit and connect the path between the battery and the power management integrated circuit after a specific period of time.