IEC 62680-2-1:2015

Universal serial bus interfaces for data and power - Part 2-1: Universal Serial Bus Specification, Revision 2.0

IEC 62680-2-1:2015 defines an industry-standard USB. The specification describes the bus attributes, the protocol definition, types of transactions, bus management, and the programming interface required to design and build systems and peripherals that are compliant with this standard. The goal is to enable such devices from different vendors to interoperate in an open architecture. The specification is intended as an enhancement to the PC architecture, spanning portable, business desktop, and home environments. It is intended that the specification allow system OEMs and peripheral developers adequate room for product versatility and market differentiation without the burden of carrying obsolete interfaces or losing compatibility.

Interfaces de bus universel en série pour les données et l'alimentation électrique - Partie 2-1: Spécification du bus universel en série, révision 2.0

IEC 62680-2-1:2015 définit une interface USB normalisée. La spécification décrit les attributs du bus, la définition du protocole, les types de transactions, la gestion du bus et l'interface de programmation exigée pour la conception et la création des systèmes et des périphériques conformes à cette norme.
L'objectif est de permettre aux dispositifs de différents fournisseurs de fonctionner ensemble dans une architecture ouverte. La spécification se veut une amélioration de l'architecture des ordinateurs, dans des environnements portables, de bureau et domestiques. La spécification vise à accorder aux fabricants d'origine (OEM, Original Equipment Manufacturer) de systèmes et aux développeurs de périphériques suffisamment de liberté pour assurer la polyvalence des produits et leur différenciation sur le marché sans avoir à prendre en charge des interfaces obsolètes ni perdre en termes de compatibilité.

General Information

• Status: Published
• Publication Date: 14-Sep-2015
• ICS: 29.200 - Rectifiers. Convertors. Stabilized power supply
• ICS: 33.120.20 - Wires and symmetrical cables
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Current Stage: PPUB - Publication issued
• Start Date: 31-Oct-2015
• Completion Date: 15-Sep-2015

Relations

• Replaces: IEC 62680-1:2013 - Universal serial bus interfaces for data and power - Part 1: Universal serial bus specification, revision 2.0
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62680-2-1 ®
Edition 1.0 2015-09
INTERNATIONAL
STANDARD
colour
inside
Universal serial bus interfaces for data and power –
Part 2-1: Universal Serial Bus Specification, Revision 2.0

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
IEC, or USB-IF at the respective address given below. Any questions about USB-IF copyright should be addressed to
the USB-IF. Enquiries about obtaining additional rights to this publication and other information requests should be
addressed to t he IEC or your local IEC member National Committee.

IEC Secretariat USB Implementers Forum, Inc.
3, rue de Varembé 3855 S.W. 153rd Drive
CH-1211 Geneva 20 Beaverton, OR 97003
Switzerland United States of America
Tel. [phone] Tel. [phone]
[e-mail] [e-mail]
www.iec.ch www.usb.org
About the IEC
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International Standards for all electrical, electronic and related technologies.

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IEC 62680-2-1 ®
Edition 1.0 2015-09
INTERNATIONAL
STANDARD
colour
inside
Universal serial bus interfaces for data and power –

Part 2-1: Universal Serial Bus Specification, Revision 2.0

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.220; 33.120; 35.200 ISBN 978-2-8322-2845-6

– 2 – IEC 62680-2-1:2015
© USB-IF 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UNIVERSAL SERIAL BUS INTERFACES FOR DATA AND POWER –

Part 2-1: Universal Serial Bus Specification, Revision 2.0

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62680-2-1 has been prepared by technical area 14: Interfaces and
methods of measurement for personal computing equipment, of IEC technical committee 100:
Audio, video and multimedia systems and equipment.
The text of this standard is based on documents prepared by the USB Implementers Forum
(USB-IF). The structure and editorial rules used in this publication reflect the practice of the
organization which submitted it.
This first edition cancels and replaces IEC 62680-1 published in 2013. This edition constitutes
a technical revision.
This bilingual version (2018-10) corresponds to the English version, publishedin 2015-09.

© USB-IF 2014
The text of this standard is based on the following documents:
CDV Report on voting
100/2331/CDV 100/2434/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The French version of this standard has not been voted upon.
A list of all the parts in the IEC 62680 series, published under the general title Universal serial
bus interfaces for data and power can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication
indicates that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 4 – IEC 62680-2-1:2015
© USB-IF 2014
INTRODUCTION
The IEC 62680 series is based on a series of specifications that were originally developed by
the USB Implementers Forum (USB-IF). These specifications were to submitted to the IEC
under the auspices of a special agreement between the IEC and the USB IF.
The USB Implementers Forum, Inc.(USB-IF) is a non-profit corporation founded by the group
of companies that developed the Universal Serial Bus specification. The USB-IF was formed
to provide a support organization and forum for the advancement and adoption of Universal
Serial Bus technology. The Forum facilitates the development of high-quality compatible USB
peripherals (devices), and promotes the benefits of USB and the quality of products that have
passed compliance testing.
ANY USB SPECIFICATIONS ARE PROVIDED TO YOU "AS IS, "WITH NO WARRANTIES
WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-
INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE. THE USB
IMPLEMENTERS FORUM AND THE AUTHORS OF ANY USB SPECIFICATIONS DISCLAIM
ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PROPRIETARY
RIGHTS, RELATING TO USE OR IMPLEMENTATION OR INFORMATION IN THIS
SPECIFICAITON.
THE PROVISION OF ANY USB SPECIFICATIONS TO YOU DOES NOT PROVIDE YOU
WITH ANY LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY
INTELLECTUAL PROPERTY RIGHTS.
Entering into USB Adopters Agreements may, however, allow a signing company to
participate in a reciprocal, royalty-free licensing arrangement for compliant products. For
more information, please see:
http://www.usb.org/developers/docs/
http://www.usb.org/developers/devclass_docs#approved

IEC DOES NOT TAKE ANY POSITION AS TO WHETHER IT IS ADVISABLE FOR YOU TO
ENTER INTO ANY USB ADOPTERS AGREEMENTS OR TO PARTICIPATE IN THE USB
IMPLEMENTERS FORUM.”
This series covers the Universal Series Bus interfaces for data and power and consists of the
following parts:
IEC 62680-1-1, Universal Serial Bus interfaces for data and power – Part 1-1: Common
components – USB Battery Charging Specification, Revision 1.2
IEC 62680-2-1, Universal Serial Bus interfaces for data and power – Part 2-1: Universal
Serial Bus Specification, Revision 2.0
IEC 62680-2-2, Universal Serial Bus interfaces for data and power – Part 2-2: USB Micro-
USB Cables and Connectors Specification, Revision 1.01
IEC 62680-2-3, Universal Serial Bus interfaces for data and power – Part 2-3: Universal
Serial Bus Cables and Connectors Class Document, Revision 2.0
This part of the IEC 62680 series consists of several distinct parts:
• the main body of the text, which consists of the original specification and all ECN and
Errata developed by the USB-IF.

© USB-IF 2014
CONTENTS
FOREWORD . 2
INTRODUCTION . 4
1 Chapter 1 Introduction . 29
1.1 Motivation . 29
1.2 Objective of the Specification . 29
1.3 Scope of the Document . 30
1.4 USB Product Compliance . 30
1.5 Document Organization . 30
2 Chapter 2 Terms and Abbreviations . 31
3 Chapter 3 Background . 37
3.1 Goals for the Universal Serial Bus . 37
3.2 Taxonomy of Application Space . 37
3.3 Feature List . 38
4 Chapter 4 Architectural Overview . 40
4.1 USB System Description . 40
4.1.1 Bus Topology . 40
4.2 Physical Interface . 41
4.2.1 Electrical . 42
4.2.2 Mechanical . 42
4.3 Power . 42
4.3.1 Power Distribution . 43
4.3.2 Power Management . 43
4.4 Bus Protocol . 43
4.5 Robustness . 43
4.5.1 Error Detection . 44
4.5.2 Error Handling . 44
4.6 System Configuration .
...

IEC 62680-2-1 ®
Edition 1.0 2015-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Universal serial bus interfaces for data and power –
Part 2-1: Universal Serial Bus Specification, Revision 2.0

Interfaces de bus universel en série pour les données et l'alimentation
électrique –
Partie 2-1: Spécification du bus universel en série, révision 2.0

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

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IEC 62680-2-1 ®
Edition 1.0 2015-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Universal serial bus interfaces for data and power –

Part 2-1: Universal Serial Bus Specification, Revision 2.0

Interfaces de bus universel en série pour les données et l'alimentation

électrique –
Partie 2-1: Spécification du bus universel en série, révision 2.0

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220; 33.120; 35.200 ISBN 978-2-8322-6102-6

– 2 – IEC 62680-2-1:2015 © IEC 2015
© USB-IF 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UNIVERSAL SERIAL BUS INTERFACES FOR DATA AND POWER –

Part 2-1: Universal Serial Bus Specification, Revision 2.0

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62680-2-1 has been prepared by technical area 14: Interfaces and
methods of measurement for personal computing equipment, of IEC technical committee 100:
Audio, video and multimedia systems and equipment.
The text of this standard is based on documents prepared by the USB Implementers Forum
(USB-IF). The structure and editorial rules used in this publication reflect the practice of the
organization which submitted it.
This first edition cancels and replaces IEC 62680-1 published in 2013. This edition constitutes
a technical revision.
This bilingual version (2018-10) corresponds to the English version, publishedin 2015-09.

© USB-IF 2014
The text of this standard is based on the following documents:
CDV Report on voting
100/2331/CDV 100/2434/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The French version of this standard has not been voted upon.
A list of all the parts in the IEC 62680 series, published under the general title Universal serial
bus interfaces for data and power can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication
indicates that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 4 – IEC 62680-2-1:2015 © IEC 2015
© USB-IF 2014
INTRODUCTION
The IEC 62680 series is based on a series of specifications that were originally developed by
the USB Implementers Forum (USB-IF). These specifications were to submitted to the IEC
under the auspices of a special agreement between the IEC and the USB IF.
The USB Implementers Forum, Inc.(USB-IF) is a non-profit corporation founded by the group
of companies that developed the Universal Serial Bus specification. The USB-IF was formed
to provide a support organization and forum for the advancement and adoption of Universal
Serial Bus technology. The Forum facilitates the development of high-quality compatible USB
peripherals (devices), and promotes the benefits of USB and the quality of products that have
passed compliance testing.
ANY USB SPECIFICATIONS ARE PROVIDED TO YOU "AS IS, "WITH NO WARRANTIES
WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-
INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE. THE USB
IMPLEMENTERS FORUM AND THE AUTHORS OF ANY USB SPECIFICATIONS DISCLAIM
ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PROPRIETARY
RIGHTS, RELATING TO USE OR IMPLEMENTATION OR INFORMATION IN THIS
SPECIFICAITON.
THE PROVISION OF ANY USB SPECIFICATIONS TO YOU DOES NOT PROVIDE YOU
WITH ANY LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY
INTELLECTUAL PROPERTY RIGHTS.
Entering into USB Adopters Agreements may, however, allow a signing company to
participate in a reciprocal, royalty-free licensing arrangement for compliant products. For
more information, please see:
http://www.usb.org/developers/docs/
http://www.usb.org/developers/devclass_docs#approved

IEC DOES NOT TAKE ANY POSITION AS TO WHETHER IT IS ADVISABLE FOR YOU TO
ENTER INTO ANY USB ADOPTERS AGREEMENTS OR TO PARTICIPATE IN THE USB
IMPLEMENTERS FORUM.”
This series covers the Universal Series Bus interfaces for data and power and consists of the
following parts:
IEC 62680-1-1, Universal Serial Bus interfaces for data and power – Part 1-1: Common
components – USB Battery Charging Specification, Revision 1.2
IEC 62680-2-1, Universal Serial Bus interfaces for data and power – Part 2-1: Universal
Serial Bus Specification, Revision 2.0
IEC 62680-2-2, Universal Serial Bus interfaces for data and power – Part 2-2: USB Micro-
USB Cables and Connectors Specification, Revision 1.01
IEC 62680-2-3, Universal Serial Bus interfaces for data and power – Part 2-3: Universal
Serial Bus Cables and Connectors Class Document, Revision 2.0
This part of the IEC 62680 series consists of several distinct parts:
• the main body of the text, which consists of the original specification an
...