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Home > Developers > Approved Device Class Document Descriptions

USB-IF Device Class Documents

The USB Device Working Group ("DWG") enables and promotes increased interoperability and reliability between USB products through documents that augment, enhance and extend USB specifications. USB-IF members may participate in the development efforts of a Working Group only after having executed the IP Agreement corresponding to the specification under development by that Group. If you are interested in working on a Device Class document, you will find the various IP Agreements and can submit your request to join in the members-only section of this site. The current set of Defined 1.0 Class Codes is available.

Approved Class Specification Documents

Approved Class Specifications are those that have officially reached Version 1.0 status and are usable to design products. Each document describes one or more classes, identified by a Class Code. Devices and interfaces that implement a class must use this Class Code (for example, in the bInterfaceClassfield). Each Approved Class Specification defines the appropriate values for SubClass and Protocol for the class(es) it defines.

Draft Class Specification Documents

Draft Class Specifications are any Version 0.9 documents. Draft Class Specifications are made available separately to avoid any confusion about which documents are usable to design products. At 0.9 the Device Working Group has a document ready for public comment that has what they believe is a complete description of the class. As the document is updated to reflect input, the revision changes from .9a to .9b, and so on.

Draft DWG specifications available for USB-IF member review and comment are posted in the member-only section of the site.

Earlier Versions

Content for the following versions is no longer posted:

  • Version 0.8 - The 0.8 Device Working Group has what they believe is a complete description of the class, and now wants comment from the entire Device Working Group. As the document is updated to reflect input, the revision changes from .8a to .8b, and so on.
  • Version 0.7 - Reflects input from members of the Class Working Group. As the document is updated, the revision changes from .7a to .7b, and so on.
  • Version 0.6 - Concept document; one person's idea for a new class. Used to garner interest from other USB-IF members to create a Class Working Group.