USB TYPE-C和USB3.1 Micro-B插座适配器线缆接线图

1. Pin A5 (CC) of the USB Type-C plug shall be connected to VBUS through a resistor Rp (56 kΩ
   ± 5%). See Section 4.5.3.2.2 and Table 4-24 for the functional description and value of Rp.
2. Contacts B6 and B7 should not be present in the USB Type-C plug.
3. All VBUS pins shall be connected together within the USB Type-C plug. Bypass capacitors are
   not required for the VBUS pins at the Micro-B receptacle end of this cable.
   4.Shield and GND grounds shall be connected together within the USB
   Type-C plug and USB 2.0 Micro-B receptacle on both ends of the adapter assembly.
4. All USB Type-C plug pins that are not listed in this table shall be open (not connected).

USB信号定义：http://www.usbzh.com/article/detail-206.html
USB接口大全：http://www.usbzh.com/article/detail-144.html
TYPE-C信号定义：http://www.usbzh.com/article/detail-722.html