OTG数据线与普通USB数据线的区别！-百度经验
16 July 2025 admin
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那么手机是如何识别USB数据线和OTG数据线的呢？ 拆解两根线之后，你会发现USB数据线的第4pin是悬空的，OTG数据线的第4pin是短接到地的，手机芯片应该是通过第4pin判断插入的是OTG数据线还是USB数据线，并以此来决定是否打开OTG供电功能。
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