In-situ IC Stress Testing with Microcontroller Monitoring
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Solution Overview
Problem
Conventional accelerated stress testing of integrated circuits does not accurately determine if multiple failures occur randomly or simultaneously, leading to potential misinterpretation of reliability and increased testing time and costs, as it interrupts testing to assess failures at predetermined points.
Innovation Solution
An apparatus with a burn-in board containing a microcontroller unit and a heater socket for in-situ testing of packaged integrated circuits, allowing continuous stress testing with individual control of stress conditions and immediate recording of failure data, enabling precise monitoring and reducing testing interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional stress testing interrupts at predetermined testing points to assess failures, then testing time and costs are reduced through periodic checks, but measurement precision of failure timing and pattern is degraded
Solution Approach 1:
The patent implements continuous monitoring of IC failures throughout the entire stress testing duration using a microcontroller that records failure data at all testing points without interruption. This eliminates the periodic interruption approach of conventional testing, maintaining continuous useful action for both monitoring and data collection, thereby achieving precise failure timing measurement without testing time loss.
2Reliability
If stress testing is conducted without continuous monitoring, then testing time is reduced through fewer interruptions, but reliability assessment accuracy is degraded due to inability to determine failure patterns
Solution Approach 1:
The patent employs a microcontroller that continuously monitors IC operation during stress testing and provides immediate feedback when failures occur. The system records failure data including timing information for each failure event, enabling accurate determination of whether failures occurred randomly or simultaneously. This feedback mechanism maintains reliability assessment accuracy while allowing continuous testing without periodic interruptions.
3Loss of information
If conventional testing methods are used with periodic interruptions, then device complexity is reduced through simpler testing setup, but loss of information about failure patterns increases
Solution Approach 1:
The patent implements a self-service monitoring system where the microcontroller automatically detects, records, and stores failure data without requiring external intervention or complex external monitoring equipment. The system serves itself by having the IC under test interact with the microcontroller through existing communication interfaces, enabling automatic failure pattern detection and information preservation while minimizing additional apparatus complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for uninterrupted accelerated testing, precise recording of failure times and conditions, and significant cost savings by reducing testing time and minimizing damage to ICs, thereby improving reliability assessment and reducing misinterpretation of failure causes.
Implementation Method 1
Elevated voltage and/or thermal stresses are applied to integrated circuit chips (IC) during qualification testing
Implementation Method 2
The microcontroller unit monitors the packaged IC for failure and records failure data
Data Source
AI summary
An apparatus with a burn-in board containing a microcontroller unit and a heater socket for insitu testing of a packaged integrated circuit while under stress. A method for insitu testing of a packaged integrated circuit while under stress. A method for insitu testing of multiple packaged integrated circuits while under stress.