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Forum USB On-The-Go补充标准
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Related

USB On-The-Go补充标准

YYD
YYD over 14 years ago

USB On-The-Go Supplement 1.0:2001年12月发布。 USB On-The-Go Supplement 1.0a:2003年6月发布,即当前版本。

  USB OTG是USB On-The-Go的缩写,是近年发展起来的技术,2001年12月18日由USB Implementers Forum公布,主要应用于各种不同的设备或移动设备间的联接,进行数据交换。特别是PDA、移动电话、消费类设备。改变如数码照相机、摄像机、打印机等设备间多种不同制式连接器,多达7种制式的存储卡间数据交换的不便。

  USB技术的发展,使得PC和周边设备能够通过简单方式、适度的制造成本将各种数据传输速度的设备连接在一起,上述我们提到应用,都可以通过USB总线,作为PC的周边,在PC的控制下进行数据交换。但这种方便的交换方式,一旦离开了PC,各设备间无法利用USB口进行操作,因为没有一个从设备能够充当PC一样的Host。

  On-The-Go,即OTG技术就是实现在没有Host的情况下,实现从设备间的数据传送。例如数码相机直接连接到打印机上,通过OTG技术,连接两台设备见的USB口,将拍出的相片立即打印出来;也可以将数码照相机中的数据,通过OTG发送到USB接口的移动硬盘上,野外操作就没有必要携带价格昂贵的存储卡,或者背一个便携电脑。

  在OTG产品中,增加了一些新的特性:

  * 新的标准,适用于设计小巧的连接器和电缆;

  * 在传统的周边设备上,增加了Host能力,适应点到点的连接;

  * 这种能力可以在两个设备间动态地切换;

  * 低的功耗,保证USB可以在电池供电情况下工作

  使用OTG后,不影响原设备和PC的连接,但使得在市场上已有超过10亿个USB接口的设备,也能通过OTG互联。

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