OTG Control Chip Single Cable Mode Switching
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Solution Overview
Problem
Conventional USB transmission technologies require two separate cables to switch the operation mode of an OTG device between host and device modes, which is inconvenient for users.
Innovation Solution
A control chip with a trigger circuit and control circuit that sets and maintains the level of an identification pin to determine the operation mode of an OTG device, allowing a single connection module to switch between host and device modes without the need for multiple cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two separate cables are used to switch operation modes of an OTG device, then the operation mode switching capability is achieved, but the ease of operation deteriorates due to the need to physically change cables
Solution Approach 1:
The patent combines two separate cables with different identification pin levels into a single cable that can dynamically switch between host and device modes. The single cable integrates the functionality of both the first cable (with low-level identification pin for host mode) and the second cable (with high-level identification pin for device mode), eliminating the need for physical cable changes while maintaining mode switching capability
Solution Approach 2:
The patent implements dynamic mode switching within a single cable by using a control chip that can change the identification pin level based on control signals. The cable transitions from a static configuration (fixed identification pin level) to a dynamic configuration (switchable identification pin level), allowing the OTG device to switch between host and device modes without physical cable changes
2Ease of operation
If a single cable is used for both host and device modes, then the ease of operation improves, but the device complexity increases due to the need for mode switching control mechanisms
Solution Approach 1:
The control chip automatically detects the connection state and switches the identification pin level without requiring user intervention or complex external control systems. The system serves itself by monitoring the connection status and autonomously adjusting the identification pin level to maintain the appropriate operation mode, thereby reducing overall system complexity despite the dynamic switching capability
Solution Approach 2:
The control chip incorporates feedback mechanisms to monitor the connection state and adjust the identification pin level accordingly. By implementing feedback control, the system can automatically respond to connection changes and maintain proper operation modes without requiring complex external control logic, thus managing device complexity through intelligent feedback-based automation
Data Source
AI summary
A control chip including a first pin, a second pin, a trigger circuit and a control circuit is provided. The first pin is configured to couple to a connection port. The second pin is configured to couple to the connection port. The trigger circuit sets a level of the second pin to a second level when the connection port is coupled to an external electronic device and the level of the second pin is equal to a first level. The control circuit maintains the level of the second pin at the second level when a voltage of the first pin is equal to a pre-determined voltage.