USB 3.0 Type C Test Cable Switch Circuit
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Solution Overview
Problem
The reversible nature of the USB 3.0 Type C interface complicates interface testing, making it difficult to test without replugging, which increases testing costs and complexity.
Innovation Solution
A test cable with a USB connector, a test terminal connector, and a switch circuit that allows test signals to be sequentially applied to different pairs of pins without replugging, enabling comprehensive testing of USB interfaces by coupling the test fixture to an electronic device through the test cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the USB 3.0 Type C interface uses reversible connection, then the interface can be inserted in any orientation, but it becomes difficult to carry out interface test without replugging
Solution Approach 1:
The test cable incorporates a switch circuit that can dynamically change the connection configuration between test pins and data pins under test. The switching mechanism allows the test system to adaptively reconfigure signal paths without physical replugging, thereby maintaining testing capability despite the reversible nature of USB Type C interface
Solution Approach 2:
The test cable acts as an intermediary device between the test fixture and the USB Type C interface under test. It includes switching elements that mediate the connection between test pins and data pins, enabling the test system to control which pins are connected to which test signals, thus solving the replugging problem caused by reversible connection
2Measurement precision
If replugging is required to test different pin configurations, then comprehensive interface testing can be achieved, but test cost and time increase
Solution Approach 1:
The test cable pre-configures multiple switching states that correspond to different pin configurations. Before actual testing begins, the switching circuit is ready to rapidly reconfigure connections between test pins and data pins, eliminating the need for time-consuming manual replugging operations while maintaining comprehensive testing capability
Solution Approach 2:
The switching circuit enables continuous testing operations by maintaining electrical connections throughout the test process. Instead of interrupting the test with replugging actions, the switching mechanism continuously redirects signals between different pin pairs, allowing uninterrupted and comprehensive interface testing
Data Source
AI summary
A test cable and a test method using the same are provided. The test cable includes a universal serial bus (USB) connector, a test terminal connector and a switch circuit. The USB connector is coupled to an electronic device and has a first pair of data pins and a second pair of data pins. The test terminal connector is coupled to a test fixture and has a pair of test data pins and a first control pin, and the test fixture is used for outputting a first control signal to the first control pin. The switch circuit is coupled to the first pair and second pair of data pins, the pair of test data pins and the first control pin, and couples the pair of test data pins to the first pair or second pair of data pins according to the first control signal.