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USB On-The-Go (OTG) basics

Posted: 19 Mar 2010     Print Version  Bookmark and Share

Keywords:USB On the Go USB OTG basics  OTG electrical aspects 

The release of the On-The-Go (OTG) supplement to the USB 2.0 specification changed the USB world. For the first time, spec-compliant USB devices can talk to each other without requiring the services of a host computer. Cell phones and PDAs can exchange contact lists, phones can attach to printers and print faxes, and MP3 players can swap tunes.

To accomplish OTG functionality, a USB device must be able to function as a host, a role previously served exclusively by desktop or laptop PCs. Adding host capability to a USB device is only part of the requirements to operate as an OTG device, however. The OTG Specification introduces new cables, connectors and two new protocols—Session Request Protocol (SRP) and Host Negotiation Protocol (HNP). Additionally, the OTG specification defines a new type of USB device with both host and peripheral capabilities called a "dual-role device."

This application note covers the electrical and protocol aspects of OTG, providing "big picture" information that should make it easier to read and understand the formal OTG Specification.

View the PDF document for more information.

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