Type-C Pin Switching for Fast Charging and 3.5 mm Audio
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Solution Overview
Problem
Type-C interfaces in mobile terminals face challenges in simultaneously supporting digital audio output, analog audio, and charging functions, particularly when using 3.5 mm earphones, as existing solutions occupy necessary pins for fast charging, limiting charging speed and security when using earphones.
Innovation Solution
A terminal device with a Type-C interface and switch units that dynamically connect pins to either the earphone interface or fast charge interface based on grounding impedance values, allowing for simultaneous fast charging and earphone functionality by separating audio and data transmission pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a Type-C interface to 3.5 mm interface adapter cable is used with digital-to-analog conversion chip and earphone power amplifier chip on the adapter, then 3.5 mm analog earphone compatibility is achieved, but the necessary pins for fast charging are occupied
Solution Approach 1:
The adapter cable segments the Type-C interface pins into two independent groups: the first group (DP and DN) is connected to the 3.5 mm earphone interface for analog audio output, while the second group (CC1 and CC2) is connected to the fast charge interface. This segmentation preserves fast charging capability while enabling 3.5 mm earphone compatibility.
Solution Approach 2:
The adapter cable acts as an intermediary device that mediates between the Type-C interface and 3.5 mm earphones. It contains the necessary digital-to-analog conversion and power amplification circuits while preserving the charging pins, allowing both analog earphone usage and fast charging to coexist.
2Ease of operation
If the first group of pins are connected to the application processor earphone interface, then digital audio output is enabled, but fast charging is disabled; if connected to fast charge interface, then fast charging is enabled but digital audio output is disabled
Solution Approach 1:
The system dynamically switches the connection state of the first group of pins between the earphone interface and fast charge interface based on detection results. When digital earphones are detected, the first group connects to the earphone interface for audio output; when fast charging is needed, the first group connects to the fast charge interface. This dynamic switching enables flexible adaptation to different usage scenarios.
Data Source
AI summary
The present disclosure provides a terminal device includes: a first Type-C interface the first Type-C interface includes a first group of pins and a second group of pins. In a case where grounding impedance value of the first group of pins is within a preset range, a controller controls the first switch unit to connect the first group of pins to the application processor earphone interface, and controls the second switch unit to connect the second group of pins to the application processor fast charge interface; or in a case where the grounding impedance value of the second group of pins is within the preset range, the controller controls the second switch unit to connect the second group of pins to the application processor earphone interface, and controls the first switch unit to connect the first group of pins to the application processor fast charge interface.