USB Type-C Resistance Detection for Factory Test Mode Entry
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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, particularly for USB Type-C connectors, which require devices to be powered and operational for factory test mode configurations, posing challenges in manufacturing and testing environments.
Innovation Solution
A method and apparatus that utilize resistance value detection between USB connector pins to automatically initiate special operating modes, including factory test modes, by configuring power management circuits and enabling autonomous entry into test modes without requiring the device to be powered or operational, using a resistor detection scheme that exceeds minimum open-circuit resistance values defined for USB Type-C connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standardized USB Type-C interfaces are used for factory testing, then communication capability is improved, but the requirement for devices to be powered and operational before testing increases complexity and reduces ease of manufacture
Solution Approach 1:
The patent applies preliminary action by detecting resistance values during the boot process before the operating system is fully loaded. The resistance detection circuit measures connector pin resistances early in the startup sequence, allowing factory test mode entry to be determined before full device operation is required. This enables test configuration to be established in advance, resolving the contradiction between using standardized interfaces and maintaining ease of manufacture.
2Extent of automation
If resistance detection is performed during boot process, then automated entry into factory test mode is enabled, but additional circuitry and measurement capability are required
Solution Approach 1:
The patent applies universality by integrating the resistance detection functionality into the existing USB Type-C connector infrastructure. The same connector pins used for standard USB communication are also used for resistance measurement to determine factory test mode entry. This multi-functional use of existing components enables automated factory test mode entry without adding separate dedicated circuitry, thus reducing overall device complexity while maintaining high automation.
3Reliability
If USB Type-C connector specifications are strictly followed, then compliance is improved, but the minimum open-circuit resistance value limits the ability to implement resistance-based mode selection
Solution Approach 1:
The patent applies local quality by implementing resistance-based mode selection at specific local points within the USB Type-C connector configuration. Rather than modifying the entire connector specification, the invention uses localized resistance measurements between specific pins (such as CC1 and CC2) to determine operational modes. This allows compliance with overall USB Type-C specifications while enabling adaptive resistance-based mode selection in specific localized contexts.
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 efficient and automated entry into factory test modes and other special operating modes, facilitating testing and configuration of devices without the need for external power delivery protocols, thus overcoming the limitations of existing USB specifications and enhancing manufacturing and testing processes.
Implementation Method 1
measuring a resistance between two terminals of a connector that is adapted to support USB communications
Data Source
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.