USB Type-C Subsystem Low-Power Ra Termination and Deep-Sleep Control
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Solution Overview
Problem
Current USB Type-C implementations consume excessive power due to keeping ICs in an active state, leading to high current and power usage, especially in battery-powered devices, and rely on external components for termination and transmit circuits, increasing overall power consumption.
Innovation Solution
The implementation of a low-power USB Type-C subsystem that disables Ra termination when not needed, uses a negative charge pump to enable Ra termination only when necessary, and transitions to a deep-sleep state to reduce power consumption, with precise voltage and current references generated to meet USB Type-C Specification requirements, allowing for reduced power usage even in active-mode scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ICs are kept in active state to maintain USB Type-C functionality, then communication and power delivery are ensured, but power consumption increases significantly
Solution Approach 1:
The patent implements dynamic power management by transitioning the IC between active and deep-sleep states based on operational requirements. The system dynamically adjusts its operational state to match the actual need for USB Type-C functionality, thereby reducing power consumption during idle periods while maintaining reliability when needed.
Solution Approach 2:
The patent changes the operational parameters of the IC by disabling Ra termination and transitioning to deep-sleep mode when USB Type-C functionality is not required. This parameter change reduces power consumption from milliamperes to 50 microamperes or less, while the ability to reactivate maintains the required functionality.
2Reliability
If Ra termination is continuously enabled to ensure proper signal termination, then signal integrity is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic enabling of Ra termination rather than continuous operation. The termination is enabled only when USB Type-C communication is active and disabled during idle periods. This periodic action maintains signal integrity during actual communication while dramatically reducing power consumption during idle states.
Solution Approach 2:
The Ra termination circuit is dynamically controlled based on the operational state of the USB Type-C subsystem. The system transitions between enabled and disabled states of the termination circuit according to actual communication needs, optimizing both signal integrity and power consumption.
3Reliability
If external components are used for termination and transmit circuits to meet USB Type-C Specification requirements, then compliance is achieved, but overall power consumption and device complexity increase
Solution Approach 1:
The patent merges the termination circuit and transmit circuit functions into the IC itself, eliminating the need for separate external components. This integration reduces device complexity and component count while maintaining compliance with USB Type-C Specification requirements through carefully designed internal circuitry.
Solution Approach 2:
The IC is designed to perform multiple functions including termination, transmission, and power management within a single component. This multi-functional design reduces the overall component count and simplifies the device architecture while maintaining full USB Type-C compliance.
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 significantly reduces power consumption, achieving current levels of 50 μA or less, compared to conventional implementations which use 5 mA or more, thereby enhancing the efficiency and battery life of USB Type-C devices.
Implementation Method 1
a negative charge pump coupled to the Ra termination circuit such that when enabled, the negative charge pump disables the Ra termination circuit
Data Source
AI summary
A Universal Serial Bus (USB) Type-C connector subsystem is described herein. An integrated circuit (IC) chip device includes a Universal Serial Bus (USB) Type-C subsystem. The USB Type-C subsystem is to operate an Ra termination circuit that consumes no more than a first predetermined amount of current after the Ra termination circuit is applied to a Vconn line of the Type-C subsystem, or to operate a standby reference circuit in a low power mode of the device to perform detection on a Configuration Channel (CC) line of the Type-C subsystem, where the device consumes no more than a second predetermined amount of current in the low power mode.