Host Interface Circuit Dual Mode Power and Data
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Solution Overview
Problem
Existing interface circuits between host devices and accessory devices, such as audio devices, often fail to provide a compatible power supply via data cables, leading to compatibility issues and limited operation modes, especially when accessory devices contain active components like active noise compensation or audio speaker systems.
Innovation Solution
The implementation of a host interface circuit and accessory interface circuit that operate in both legacy and power modes, using a data cable to provide power and support both compatible and incompatible accessory devices, with the first line of the data cable functioning as a power supply or biasing line, allowing for initialization and operation in various modes such as call mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the interface circuit operates in legacy mode to support incompatible accessory devices, then compatibility is improved, but power supply capability via data cable is lost
Solution Approach 1:
The interface circuit dynamically switches between legacy mode and power mode based on compatibility detection. During initialization, the system detects whether the accessory device supports power supply via the first line, then transitions to the appropriate operational mode, enabling both compatibility and power supply capability without conflict
Solution Approach 2:
The system changes operational parameters by switching between two distinct modes: legacy mode (where the first line is connected to legacy terminal for biasing) and power mode (where the first line is connected to power regulator for power supply). This parameter change allows the same hardware to support both incompatible and compatible devices
2Use of energy by moving object
If the interface circuit operates in power mode to provide power supply via data cable, then power supply capability is improved, but compatibility with legacy accessory devices is lost
Solution Approach 1:
The system performs preliminary compatibility detection during initialization phase before entering power mode. By detecting whether the accessory device supports power supply via the first line during the initialization mode, the system ensures that power mode is only activated when compatible, thus maintaining both power supply capability and compatibility
Solution Approach 2:
The initialization mode acts as an intermediary between legacy mode and power mode. It detects compatibility characteristics of the connected accessory device and determines which mode should be activated, serving as a mediator that resolves the contradiction between power supply capability and compatibility
3Power
If the first line is used for power supply in power mode, then power delivery is improved, but microphone functionality in legacy mode is lost
Solution Approach 1:
The connection configuration of the first line is dynamically changed based on operational mode. In legacy mode, the first line is connected to the legacy terminal to support microphone functionality. In power mode, the first line is connected to the power regulator to provide power delivery. This dynamic reconfiguration allows the same line to serve different functions
Data Source
AI summary
A host interface circuit operates in a power mode when connected to an accessory device compatible with a power supply via a first line of a data cable. During power mode, the host interface circuit couples a power regulator to the first line. The host interface circuit operates in a legacy mode when connected to an accessory device not compatible with such a power supply and couples the legacy terminal to the first line during legacy mode. An accessory interface circuit configured to operate in a power mode when connected to a host device capable of a power supply via a first line couples a power input of an active device to the first line and a data input of the active device to a second line during power mode.