SIST EN 62680-3:2014

Universal Serial Bus interfaces for data and power -- Part 3: USB battery charging specification

The Battery Charging Working Group is chartered with creating specifications that define limits as well as detection, control and reporting mechanisms to permit devices to draw current in excess of the USB 2.0 specification for charging and/or powering up from dedicated chargers, hosts, hubs and charging downstream ports. These mechanisms are backward compatible with USB 2.0 compliant hosts and peripherals.

Schnittstellen des Universellen Seriellen Busses für Daten und Energie - Teil 3: Festlegung für den USB-Batterie-Ladevorgang, Überarbeitung 1.2

Interfaces de bus universel en série pour les données et l'alimentation électrique - Partie 3: Spécification de chargement des batteries USB, révision 1.2

La CEI 62680-3:2013 contient les spécifications définissant des limites ainsi que des mécanismes de détection, de contrôle et de rapports pour permettre à des appareils de puiser une quantité de courant supérieure à celle prévue par la spécification USB 2.0 pour se charger et/ou s'allumer à l'aide de chargeurs, d'hôtes, de concentrateurs et de ports en aval de chargement dédiés. Ces mécanismes sont rétrocompatibles avec les hôtes et périphériques compatibles USB 2.0. Le texte est issu de documents élaborés par l'USB Implementers Forum (USB-IF). Les règles structurelles et éditoriales utilisées dans la présente publication reflètent les pratiques en vigueur au sein de l'organisme responsable de sa soumission.

Vmesniki univerzalnega serijskega vodila za prenos podatkov in napajanje - 3. del: Specifikacija za polnjenje baterij prek USB

General Information

• Status: Published
• Publication Date: 20-Feb-2014
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: AVM - Audio, video and multimedia systems and equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 17-Dec-2013
• Due Date: 21-Feb-2014
• Completion Date: 21-Feb-2014
• Ref Project: EN 62680-3:2013 - Universal serial bus interfaces for data and power - Part 3: USB battery charging specification, Revision 1.2

Relations

• Replaced By: SIST EN 62680-1-1:2016 - Universal Serial Bus interfaces for data and power - Part 1-1: Universal Serial Bus interfaces - Common components - USB Battery Charging Specification, Revision 1.2 (IEC 62680-1-1:2015)
• Effective Date: 18-Oct-2016

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 62680-3:2014
01-april-2014
Vmesniki univerzalnega serijskega vodila za prenos podatkov in napajanje - 3. del:
Specifikacija za polnjenje baterij prek USB
Universal Serial Bus interfaces for data and power -- Part 3: USB battery charging
specification
Ta slovenski standard je istoveten z: EN 62680-3:2013
ICS:
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
SIST EN 62680-3:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62680-3:2014

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SIST EN 62680-3:2014

EUROPEAN STANDARD
EN 62680-3

NORME EUROPÉENNE
September 2013
EUROPÄISCHE NORM

ICS 29.220; 35.200


English version


Universal serial bus interfaces for data and power -
Part 3: USB battery charging specification, Revision 1.2
(IEC 62680-3:2013)


Interfaces de bus universel en série pour Schnittstellen des Universellen Seriellen
les données et l'alimentation électrique - Busses für Daten und Energie -
Partie 3: Spécification de chargement des Teil 3: Festlegung für den USB-Batterie-
batteries USB, révision 1.2 Ladevorgang, Überarbeitung 1.2
(CEI 62680-3:2013) (IEC 62680-3:2013)




This European Standard was approved by CENELEC on 2013-09-27. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62680-3:2013 E

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SIST EN 62680-3:2014
EN 62680-3:2013 - 2 -
Foreword
The text of document 100/2157/FDIS, future edition 1 of IEC 62680-3, prepared by Technical Area 14
“Interfaces and methods of measurement for personal computing equipment” of IEC/TC 100 “Audio,
video and multimedia systems and equipment" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 62680-3:2013.

The following dates are fixed:
• latest date by which the document has to be (dop) 2014-06-27
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2016-09-27
• latest date by which the national
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.

Endorsement notice
The text of the International Standard IEC 62680-3:2013 was approved by CENELEC as a European
Standard without any modification.

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SIST EN 62680-3:2014




IEC 62680-3

®


Edition 1.0 2013-08




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










Universal serial bus interfaces for data and power –

Part 3: USB Battery Charging Specification, Revision 1.2




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

électrique –

Partie 3: Spécification de chargement des batteries USB, révision 1.2















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX XB


ICS 29.220; 35.200 ISBN 978-2-8322-1049-9



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 62680-3:2014
– 2 – 62680-3 © IEC:2013
 © USB-IF:2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

UNIVERSAL SERIAL BUS INTERFACES FOR DATA AND POWER –

Part 3: USB Battery Charging Specification, Revision 1.2

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 62680-3 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.
The text of this standard is based on the following documents:
FDIS Report on voting
100/2157/FDIS 100/2190/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

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SIST EN 62680-3:2014
62680-3 © IEC:2013 – 3 –
© USB-IF:2012
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 web site 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.

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SIST EN 62680-3:2014
– 4 – 62680-3 © IEC:2013
 © USB-IF:2012
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 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, Universal Serial Bus interfaces for data and power - Part 1: Universal Serial Bus
Specification, Revision 2.0

IEC 62680-2, Universal Serial Bus interfaces for data and power - Part 2: USB Micro-USB
Cables and Connectors Specification, Revision 1.01

IEC 62680-3, Universal Serial Bus interfaces for data and power - Part 3: USB Battery
Charging Specification, Revision 1.2

IEC 62680-4, Universal Serial Bus interfaces for data and power - Part 4: 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;

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SIST EN 62680-3:2014
62680-3 © IEC:2013 – 5 –
© USB-IF:2012
CONTENTS
1 Introduction . 12
1.1 Scope . 12
1.2 Background . 12
1.3 Reference Documents . 12
1.4 Definitions of Terms . 12
1.4.1 Accessory Charger Adaptor . 12
1.4.2 ACA-Dock . 13
1.4.3 Attach versus Connect . 13
1.4.4 Charging Downstream Port . 13
1.4.5 Charging Port . 13
1.4.6 Dead Battery Threshold . 13
1.4.7 Dedicated Charging Port . 13
1.4.8 Downstream Port . 14
1.4.9 Micro ACA . 14
1.4.10 Portable Device . 14
1.4.11 Rated Current . 14
1.4.12 Standard ACA . 14
1.4.13 Standard Downstream Port . 14
1.4.14 USB Charger . 14
1.4.15 Weak Battery Threshold . 14
1.5 Parameter Values . 14
1.6 OTG Considerations . 15
1.7 Super Speed Considerations . 15
2 Dead Battery Provision . 15
2.1 Background . 15
2.2 DBP – Unconfigured Clause . 15
2.3 DBP – Configured Clause . 16
3 Charging Port Detection . 17
3.1 Overview . 17
3.2 Charger Detection Hardware . 18
3.2.1 Overview . 18
3.2.2 VBUS Detect . 18
3.2.3 Data Contact Detect . 19
3.2.4 Primary Detection . 22
3.2.5 Secondary Detection. 29
3.2.6 ACA Detection . 32
3.3 Charger Detection Algorithms . 34
3.3.1 Weak Battery Algorithm . 34
3.3.2 Good Battery Algorithm . 35
3.4 Charger Detection Timing . 36
3.4.1 Data Contact Detect Timing . 36
3.4.2 Detection Timing, CDP . 39
3.5 Ground Current and Noise Margins . 40
4 Charging Port and Portable Device Requirements . 40
4.1 Charging Port Requirements . 40
4.1.1 Overshoot . 40
4.1.2 Maximum Current . 40

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SIST EN 62680-3:2014
– 6 – 62680-3 © IEC:2013
 © USB-IF:2012
4.1.3 Detection Renegotiation . 41
4.1.4 Shutdown Operation . 41
4.1.5 Failure Voltage . 41
4.1.6 Multiple Ports. 41
4.2 Charging Downstream Port . 41
4.2.1 Required Operating Range . 41
4.2.2 Shutdown Operation . 42
4.2.3 Undershoot . 42
4.2.4 Detection Signaling . 42
4.2.5 Connector . 43
4.3 ACA-Dock . 43
4.3.1 Required Operating Range . 43
4.3.2 Undershoot . 43
4.3.3 Detection Signaling . 43
4.3.4 Connector . 43
4.4 Dedicated Charging Port . 43
4.4.1 Required Operating Range . 43
4.4.2 Undershoot . 44
4.4.3 Detection Signaling . 44
4.4.4 Connector . 44
4.5 Accessory Charger Adapter . 45
4.5.1 Required Operating Range . 45
4.5.2 Undershoot . 45
4.5.3 Detection Signaling . 45
4.5.4 Connector . 45
4.6 Portable Device . 45
4.6.1 Allowed Operating Range . 45
4.6.2 Detection Signaling . 46
4.6.3 Detection Renegotiation . 46
4.6.4 Connector . 47
5 Parameter Values . 47
6 Accessory Charger Adapter . 50
6.1 Introduction . 50
6.2 Micro ACA . 52
6.2.1 Micro ACA Ports . 52
6.2.2 Micro ACA Connectivity Options . 53
6.2.3 Micro ACA Architecture . 54
6.2.4 Micro ACA Modes of Operation . 54
6.2.5 Implications of not Supporting Micro ACA Detection . 55
6.2.6 Micro ACA Requirements . 56
6.2.7 Portable Device State Diagram . 57
6.3 Standard ACA . 59
6.3.1 Standard ACA Ports . 59
6.3.2 Standard ACA Architecture . 60
6.3.3 Standard ACA Modes of Operation . 61
6.3.4 Implications of not Supporting Standard ACA Detection . 61
6.3.5 Standard ACA Requirements . 61

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SIST EN 62680-3:2014
62680-3 © IEC:2013 – 7 –
© USB-IF:2012
Battery Charging
Specification
(Including errata and ECNs through March 15, 2012)

Revision 1.2
March 15, 2012

Copyright © 2012, USB Implementers Forum, Inc.
All rights reserved.

A LICENSE IS HEREBY GRANTED TO REPRODUCE THIS SPECIFICATION FOR INTERNAL
USE ONLY. NO OTHER LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR
OTHERWISE, IS GRANTED OR INTENDED HEREBY.
USB-IF AND THE AUTHORS OF THIS SPECIFICATION EXPRESSLY DISCLAIM ALL
LIABILITY FOR INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS, RELATING TO
IMPLEMENTATION OF INFORMATION IN THIS SPECIFICATION. USB-IF AND THE
AUTHORS OF THIS SPECIFICATION ALSO DO NOT WARRANT OR REPRESENT THAT
SUCH IMPLEMENTATION(S) WILL NOT INFRINGE THE INTELLECTUAL PROPERTY
RIGHTS OF OTHERS.
THIS SPECIFICATION IS PROVIDED "AS IS” AND WITH NO WARRANTIES, EXPRESS OR
IMPLIED, STATUTORY OR OTHERWISE. ALL WARRANTIES ARE EXPRESSLY
DISCLAIMED. NO WARRANTY OF MERCHANTABILITY, NO WARRANTY OF NON-
INFRINGEMENT, NO WARRANTY OF FITNESS FOR ANY PARTICULAR PURPOSE, AND
NO WARRANTY ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE.
IN NO EVENT WILL USB-IF OR USB-IF MEMBERS BE LIABLE TO ANOTHER FOR THE
COST OF PROCURING SUBSTITUTE GOODS OR SERVICES, LOST PROFITS, LOSS OF
USE, LOSS OF DATA OR ANY INCIDENTAL, CONSEQUENTIAL, INDIRECT, OR SPECIAL
DAMAGES, WHETHER UNDER CONTRACT, TORT, WARRANTY, OR OTHERWISE,
ARISING IN ANY WAY OUT OF THE USE OF THIS SPECIFICATION, WHETHER OR NOT
SUCH PARTY HAD ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

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SIST EN 62680-3:2014
– 8 – 62680-3 © IEC:2013
 © USB-IF:2012
Contributors
Mark Lai Allion Test Labs
Sammy Mbanta Astec Power
Abel Astley Broadcom
Kenneth Ma Broadcom
Shimon Elkayam Broadcom
Gaurav Singh Cypress
Dan Ellis DisplayLink
Graham Connolly Fairchild
Oscar Freitas Fairchild
Joel Silverman Kawasaki
Pat Crowe MQP Electronics
Juha Heikkila Nokia
Richard Petrie Nokia
Sten Carlsen Nokia
Jeroen Kleinpenning NXP Semiconductors
Terry Remple, Chair Qualcomm
Dave Haglan SMSC
Mark Bohm SMSC
Morgan Monks SMSC
Tim Knowlton SMSC
Morten Christiansen ST Ericsson
Nicolas Florenchie ST Ericsson
Shaun Reemeyer ST Ericsson
George Paparrizos Summit Microelectronics
Adam Burns Synopsys
Wei Ming Telecommunication Metrology Center of MII
Jean Picard Texas Instruments
Ivo Huber Texas Instruments
Pasi Palojarvi Texas Instruments
Steven Tom Texas Instruments
Ed Beeman USB-IF
Mark Paxson USB-IF

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SIST EN 62680-3:2014
62680-3 © IEC:2013 – 9 –
© USB-IF:2012
Revision History
Revision Date Author Description
BC1.0 Mar 8, 2007 Terry Remple First release

BC1.1 April 15, 2009 Terry Remple Major updates to all sections. Added Data Contact
Detect protocol, and Accessory Charger Adapter.

BC1.2 Oct 5, 2010 Terry Remple Following items indicate changes from BC1.1 to BC1.2.
References below to Section, Figures and Tables refer
Adam Burns
to BC1.2, unless BC1.1 is specifically indicated.
1. Allow DCPs to output more than 1.5A. Allows
Portable Devices (PDs) with switch mode chargers to
draw more power. Section 4.4.1.
2. Increase minimum CDP current to 1.5A. Without
change, PDs had to draw less than 500mA, to avoid
CDP shutdown. Table 5-2.
3. Indicate that ICDP max and IDCP max limits of 5A
come from USB 2.0, and are safety limits. Table 5-2
note 1.
4. Allow PDs to draw up to 1.5A during HS chirp and
traffic. Remove previous limits of 560mA and 900mA
which was based on HS common mode ranges. Section
3.5.
5. Require CDPs to support 1.5A during HS chirp and
traffic. Affects CDP common mode range. Section 3.5.
6. Reduce maximum PD current from 1.8A to 1.5A, to
avoid shutdown when attached to CDP. Table 5-2.
7. Rename Docking Station to ACA-Dock, to avoid
confusion with other types of Docking Stations.
8. Require ACA-Dock to differentiate itself from an ACA,
by enabling VDM_SRC during no activity. Section
3.2.4.4.
9. Allow CDP to leave VDM_SRC enabled while
peripheral not connected. Section 3.2.4.2.
10. Remove ICHG_SHTDWN. This was a recommended
max output current for Charging Ports with VBUS
grounded. BC1.1 Section 4.1.
11. Require VDP_SRC to not pull D+ below 2.2V when
D+ is being pulled to VDP_UP through RDP_UP.
Require VDM_SRC to not pull D- below 2.2V when D- is
being pulled high. Required for ACA-Dock support.
Table 5-1 notes 1 and 2.
12. Make DCD current source optional for PDs. Section
3.2.3.
13. Make DCD timeout required for PDs. Section 3.2.3.
14. Make Secondary Detection optional for PDs. Section
4.6.2.
15. Make Good Battery Algorithm required behavior for
PDs. Section 3.2.4.
16. Remove resistive detection. BC1.1 Section 3.9.
17. Change PD Required Operating Range to include
4.5V at 500mA. Figure 4-3.
18. Allow any downstream port to act as a DCP. Section
4.1.3.
19. Require PDs to enable VDP_SRC or RDP_PU when
charging from a DCP. Section 3.3.2.
20. Allow chargers to renegotiate current with PD by
dropping and reasserting VBUS. Section 4.1.3.

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SIST EN 62680-3:2014
– 10 – 62680-3 © IEC:2013
 © USB-IF:2012
Revision Date Author Description
21. Require PDs to discharge their own VBUS input
after VBUS drops to support charger port renegotiation
request. Section 4.6.3.
22. Allow PDs to disconnect and repeat Charger
Detection multiple times while attached, with specified
timing. Section 4.6.3.
23. Reduce DCP input impedance between D+, D- to
VBUS and ground from 1MΩ to 300kΩ. Section 4.4.3.
24. Require CDPs to recover after ov
...