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您好！ 使用的是AM6231平台，USB1接的是蜂窝模组， 那USB1_VBUS需要怎么接？
1：直接上拉接到3V3上？
2：还是可以不接？
我不太清楚您说的蜂窝模组，usb vbus在不同工作模式下的接法请参考12.3.2.2.2 Typical Pin Connections of Device
www.ti.com.cn/.../spruiv7a.pdf
