USB Type-C Resistor Detection for Battery-Free Factory Testing
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Solution Overview
Problem
The increasing complexity of mobile communication devices necessitates improved test capabilities, but existing standardized interfaces are hindered by stringent signaling and electrical specifications, requiring devices to be powered-on and operational for test procedures, which poses challenges in factory testing environments where devices may not have a battery installed.
Innovation Solution
A method involving a resistor detection circuit that measures resistance values between pins of a USB Type-C connector to automatically initiate special operating modes, including factory test modes, by configuring power management settings and enabling power through the connector, allowing devices to enter test modes without relying on USB power delivery protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standardized interfaces are used for test procedures, then communication control and monitoring capabilities are improved, but the requirement for devices to be powered-on and operational creates testing limitations in factory environments
Solution Approach 1:
The device enters a special operating mode before normal operation to perform factory tests. This preliminary action allows testing to be conducted in a controlled state without requiring the device to be fully powered-on or operational, resolving the contradiction between test capability and testing condition flexibility
Solution Approach 2:
A resistor is introduced as an intermediary component between the test equipment and the device under test. This resistor serves as a signal mediator that triggers the special operating mode, enabling communication and testing without requiring the device to be in its normal operational state
2Reliability
If devices require powered-on state for communication interfaces to function, then interface reliability is improved, but testing becomes impossible for devices without installed batteries
Solution Approach 1:
The special operating mode is activated before normal device operation to perform necessary factory tests. This allows testing of communication interfaces and other functions without requiring the device to be in its normal powered-on state, making factory testing possible for devices without installed batteries
Solution Approach 2:
The special operating mode creates a simplified operational state that copies essential functionality needed for testing, without requiring the full operational complexity of the normal powered-on state. This enables testing capabilities in devices that would otherwise be impossible to test
3Use of energy by moving object
If USB power delivery protocols are used for factory testing, then power management is improved, but the complexity of protocol implementation increases
Solution Approach 1:
The power delivery protocol implementation is extracted and removed from the factory testing process. Instead of using the complex USB power delivery protocols, the system uses a simpler resistor-based signaling mechanism to enter special operating mode, reducing implementation complexity while maintaining power management capabilities
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
Enables automated entry into factory test modes and other special operating modes, facilitating efficient testing of devices without the need for a battery or powered state, thereby simplifying the testing process and overcoming the limitations of existing USB power delivery protocols.
Implementation Method 1
a resistor may be coupled to a pin or conductor associated with a connector of the device in order to initiate entry into a special operating mode. The device to be tested may be adapted to measure resistance values between two or more pins or conductors of the connector
Data Source
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AI summary
Systems, methods, and apparatus for testing devices adapted for connection to other devices using universal serial bus (USB) are disclosed. Devices to be tested are caused to enter a special mode of operation when resistance measured at one or more terminals of a USB Type-C connector have values associated with the special mode of operation. One or more operations of the device are automatically initiated when the resistance coupled to the at least one terminal of the connector has a measured value that matches one of a set of resistance values maintained by the device. The one or more operations may include configuring a power management circuit based on the measured value, and entering a mode of operation that controls startup of at least one processor on the device when the measured value matches a first resistance value.