Input-Output Circuit Accessory Identification
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Solution Overview
Problem
Existing input-output circuits in smartphones and other mobile devices face challenges in accurately identifying and managing accessory devices connected via micro-USB connectors, particularly in sharing functions like power, data, and video signals, leading to increased power consumption and circuit complexity due to the need for high-precision analog-to-digital converters.
Innovation Solution
An input-output circuit that includes an identification terminal voltage detecting circuit, a control unit, and a video switch, which detects the voltage of the identification terminal to identify accessory devices and control signal switching, reducing circuit complexity by classifying accessory devices into groups based on power feeding and terminal states, and using a capacitor to manage video signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a micro-USB connector is used to share power, data, and video signals, then the connector scale and designability are improved, but the circuit complexity and power consumption increase due to the need for high-precision analog-to-digital converters
Solution Approach 1:
The patent segments the accessory device identification into multiple voltage ranges (first voltage range for first type, second voltage range for second type). This segmentation allows the system to use simple voltage range comparison instead of high-precision analog-to-digital conversion, thereby reducing circuit complexity while maintaining the ability to identify different accessory types through the shared micro-USB connector
Solution Approach 2:
The patent changes the identification parameter from requiring high-precision analog values to using voltage range thresholds. By defining specific voltage ranges (first voltage range, second voltage range) that correspond to different accessory types, the system can use simple comparators instead of complex ADC circuits, reducing both circuit complexity and power consumption while enabling connector sharing
2Measurement precision
If the identification terminal voltage detecting circuit detects voltage to identify accessory devices, then the identification accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent applies partial action by using only voltage range detection rather than full high-precision analog-to-digital conversion. The identification terminal voltage detecting circuit detects voltage and compares it against predefined thresholds (first voltage range, second voltage range), which provides sufficient identification accuracy for distinguishing accessory types while consuming significantly less power than high-precision ADC would require
3Adaptability or versatility
If multiple functions are shared through one connector, then the device versatility is improved, but the difficulty of detecting and measuring accessory states increases
Solution Approach 1:
The patent segments the detection process into distinct voltage range comparisons. By dividing the voltage spectrum into first voltage range and second voltage range, each corresponding to different accessory types, the system simplifies the detection of multiple accessory states. This segmentation allows the control unit to easily determine which type of accessory is connected without complex measurement circuits
Solution Approach 2:
The patent changes the detection parameter from requiring complex multi-parameter measurement to using simple voltage threshold comparison. By defining specific voltage ranges that correspond to different accessory functions (power feeding state, terminal connection state), the system can detect multiple accessory states through a single voltage parameter, reducing detection difficulty while maintaining versatility
Data Source
AI summary
An identification terminal voltage detecting circuit detects a voltage of an identification terminal. A video switch is inserted into a signal line connecting a video circuit included in an internal circuit and the identification terminal. When a voltage representing that a video cable is connected to a connector is detected, and then a voltage representing that the video cable is terminated with specified impedance is detected, the control unit turns on the video switch.