最終更新:2015-10-16 (金) 23:02:07 (3113d)  

ID端子
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USB OTG

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  • Three additional ID pin states are defined at the nominal resistance values of 124 kΩ, 68 kΩ, and 36.5 kΩ, with respect to the ground pin. These permit the device to work with USB Accessory Charger Adapters that allows the OTG device to be attached to both a charger and another device simultaneously.
  • These three states are used in the cases of:
  • A charger and either no device or an A-device that is not asserting VBUS (not providing power) are attached. The OTG device is allowed to charge and initiate SRP but not connect.[6]
  • A charger and an A-device that is asserting VBUS (is providing power) are attached. The OTG device is allowed to charge and connect but not initiate SRP.[6]
  • A charger and a B-device are attached. The OTG device is allowed to charge and enter host mode.[6]



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