Pin Driver Monitor Circuit for Real-Time Stuck Voltage Detection
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Solution Overview
Problem
Existing electronic devices face challenges in detecting stuck voltage states during operation, which can lead to abnormal functioning and require dedicated test equipment or built-in self-test logic, limiting the ability to perform pin tests before system activation or only during initialization.
Innovation Solution
An electronic device with a monitor circuit that detects stuck voltage states by comparing input and output signals, using multiple detection circuits for logical correctness and voltage level checks, allowing for real-time monitoring without disrupting normal operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated test equipment or built-in self-test logic is used to detect stuck voltage states, then detection capability is improved, but device complexity and operational disruption increase
Solution Approach 1:
The monitor circuit uses the existing driver and signal lines to perform both normal signal transmission and stuck voltage state detection. The same output signal line is utilized for both its original function and for monitoring purposes by comparing it with the input signal, eliminating the need for dedicated test equipment or separate self-test logic circuits.
Solution Approach 2:
The system performs self-diagnosis by having the monitor circuit continuously compare the input signal with the output signal from the driver. The detection is achieved using the device's own existing components (driver, signal lines, and logic circuits) without requiring external test equipment or additional specialized self-test circuits.
2Ease of operation
If pin tests are performed before system activation or only during initialization, then detection simplicity is improved, but operational coverage deteriorates
Solution Approach 1:
The monitor circuit continuously compares the input signal with the output signal throughout the entire operational period, not just during initialization or before system activation. This continuous monitoring ensures that stuck voltage states can be detected at any time during normal operation, providing comprehensive detection coverage while maintaining simple operation through automated continuous comparison.
3Loss of time
If real-time monitoring is implemented during normal operations, then detection timeliness is improved, but operational disruption increases
Solution Approach 1:
The monitor circuit performs real-time detection by continuously comparing the input signal with the output signal using the same signal lines and logic circuits that are already active during normal operation. This approach enables immediate detection of stuck voltage states without requiring separate test modes or disrupting the normal functional operations of the device.
Data Source
AI summary
An electronic device includes a driver that is connected with a pin, receives an input signal, and outputs an output signal to the pin in response to the input signal, a core circuit that transfers the input signal to the driver, and a monitor circuit that receives the input and output signals and detects a stuck voltage state of the output signal based on the input and output signals. The monitor circuit includes a first detection circuit that detects the stuck voltage state when the input and output signals are logically incorrect, a second detection circuit that detects the stuck voltage state when the input and output signals are logically correct and when the output signal is at a low level, and a third detection circuit that detects the stuck voltage state when the input and output signals are logically correct and when the output signal is at a high level.