IEC 63002:2021

Interoperability specifications and communication method for external power supplies used with computing and consumer electronics devices

IEC 63002:2021 defines common charging interoperability guidelines for power sources (external power supplies (EPSs) and other Sources) used with computing and consumer electronics devices that implement IEC 62680-1-3 (USB Type-C Cable and Connector Specification).
This document defines normative requirements for an EPS to ensure interoperability; in particular, it specifies the data communicated from a power source to a device and certain safety elements of the EPS, cable, and device. While the requirements focus of this document is on the EPS and the behaviour at its USB Type-C connector interface, it is also important to comprehend cable assembly and device capabilities and behaviours in order to assure end-to-end charging interoperability. This document does not apply to all design aspects of an EPS. This document does not specify regulatory compliance requirements for aspects such as product safety, EMC or energy efficiency.
This document provides recommendations for the behaviour of a device when used with a power source compliant with this document. It specifies the minimum hardware specification for an EPS implementing IEC 62680-1-3. This document also specifies the data objects used by a charging system utilizing IEC 62680-1-2 to understand the identity, design and performance characteristics, and operating status of an external power supply. IEC 62680-1-2 focuses on power delivery applications ranging to 100 W for a variety of computing and consumer electronics devices including notebook computers, tablets, smartphones, small form-factor desktops, monitor displays and other related multimedia devices.
This document relies on established mechanical and electrical specifications, and communication protocols specified by IEC 62680-1-2 and IEC 62680-1-3. These specifications support methods for establishing the best performing interoperability between untested combinations of EPS and devices with the aim of improving consumer satisfaction.
Information describing the USB charging interoperability model, overview of USB Type-C and USB Power Delivery specifications, and factors for charging performance are also provided to support implementation of this document.
IEC 63002:2021 cancels and replaces the first edition published in 2016. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) title is changed from Identification and communication interoperability method for external power supplies used with portable computing devices;
b) Clause 4, EPS interoperability based on USB technologies, is added;
c) Clause 5, EPS specification, adds hardware and protection requirements; overvoltage protection is changed from optional to normative;
d) Annex B and Annex C are added, providing an explanation of the design features in USB Power Delivery that enhance reliability and an explanation of the concepts of charge rate and power.

Spécifications d'interopérabilité et méthode de communication pour les alimentations externes utilisées avec les dispositifs informatiques et les dispositifs électroniques grand public

L'IEC 63002:2021 définit des lignes directrices pour l'interopérabilité de la charge commune des sources d'alimentation (alimentations externes [EPS] et autres Sources) utilisées avec les dispositifs informatiques et les dispositifs électroniques grand public qui mettent en œuvre l'IEC 62680-1-3 (spécification des câbles et connecteurs USB Type-C).
Le présent document définit les exigences normatives des EPS en matière d'interopérabilité; il spécifie notamment les données communiquées par une source d'alimentation à un dispositif (voir Figure 1) et certains éléments de sécurité de l'EPS, du câble et du dispositif. Alors que les exigences définies dans le présent document concernent l'EPS et le comportement au niveau de l'interface de son connecteur USB Type-C, il est également important de comprendre les capacités et le comportement des ensembles de câbles et des dispositifs afin d'assurer une interopérabilité de bout en bout de la charge. Le présent document ne couvre pas tous les aspects de conception d'une EPS. Le présent document ne définit pas les exigences de conformité réglementaire pour des aspects tels que la sécurité des produits, la comptabilité électromagnétique (CEM) ou l'efficacité énergétique.
Le présent document fournit des recommandations pour le comportement d'un dispositif lorsqu'il est utilisé avec une source d'alimentation conforme au présent document. Il spécifie les caractéristiques matérielles minimales exigées pour une EPS qui met en œuvre l'IEC 62680-1-3. Le présent document spécifie également les objets de données utilisés par un système de charge conforme à l'IEC 62680-1-2 pour comprendre les caractéristiques d'identité, de conception et de performance, ainsi que l'état de fonctionnement d'une alimentation externe. L'IEC 62680-1-2 se concentre sur les applications d'alimentation jusqu'à 100 W pour une large gamme de dispositifs informatiques et de dispositifs électroniques grand public, notamment les ordinateurs portables, les tablettes, les mobiles multifonctions, les ordinateurs de bureau compacts, les moniteurs et d'autres dispositifs multimédias analogues.
Le présent document s'appuie sur les spécifications mécaniques et électriques établies, ainsi que sur les protocoles de communication spécifiés dans l'IEC 62680-1-2 et l'IEC 62680-1-3. Ces spécifications décrivent les méthodes qui visent à optimiser l'interopérabilité entre les combinaisons EPS-dispositif qui n'ont pas été soumises à l'essai dans le but d'améliorer la satisfaction du client.
Le présent document décrit également le modèle d'interopérabilité de la charge USB, la spécification USB Type-C et la spécification de l'alimentation électrique par port USB, ainsi que les facteurs de rendement de charge nécessaires aux fins de mise en œuvre.
L'IEC 63002:2021 annule et remplace la première édition parue en 2016. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) la présente norme a été renommée (anciennement intitulée Méthode d'identification et d'interopérabilité des communications des alimentations externes utilisées avec les dispositifs informatiques portatifs);
b) le nouvel Article 4 traite de l'Interopérabilité de l'EPS avec les technologies USB;
c) l'Article 5, Spécification EPS, fournit des exigences relatives au matériel et à la protection; la protection à maximum de tension n'est plus facultative, mais est désormais normative;
d) les nouvelles Annexe B et Annexe C décrivent les caractéristiques de conception de l'alimentation électrique par port USB qui améliorent la fiabilité; elles expliquent également les concepts de régime et de puissance de charge.

General Information

• Status: Published
• Publication Date: 26-May-2021
• ICS: 31.020 - Electronic components in general
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: TA 18 - Multimedia home systems and applications for end-user networks
• Drafting Committee: MT 63002 - TC 100/TA 18/MT 63002
• Current Stage: PPUB - Publication issued
• Start Date: 27-May-2021
• Completion Date: 14-Jun-2021

Relations

• Revised: IEC 63002:2025 - Interoperability specifications and communication method for external power supplies used with computing and consumer electronics devices
• Effective Date: 05-Sep-2023
• Revises: IEC 63002:2016 - Identification and communication interoperability method for external power supplies used with portable computing devices
• Effective Date: 05-Sep-2023

Overview - What IEC 63002:2021 covers

IEC 63002:2021 defines interoperability specifications and a communication method for external power supplies (EPSs) used with computing and consumer electronics devices that implement IEC 62680‑1‑3 (USB Type‑C) and IEC 62680‑1‑2 (USB Power Delivery / USB PD). The standard specifies the minimum hardware and data‑reporting requirements for an EPS so devices can identify source capabilities, understand operating status, and negotiate safe, efficient charging. It focuses on end‑to‑end charging interoperability across EPS, cable assemblies and devices, while relying on the electrical and protocol definitions in IEC 62680 series.

Key technical topics and requirements

• Data objects and communication: Defines the data communicated from the power source to a device (USB PD data objects) so devices can identify EPS model, capabilities and performance characteristics.
• Minimum EPS hardware spec: Specifies baseline hardware features an EPS must implement when using USB Type‑C and USB PD.
• Protection requirements: Adds normative protection requirements (for example, overvoltage protection is now normative in this edition).
• USB Type‑C and USB PD interoperability: Explains how Type‑C cable identity, current capacity and PD negotiation affect interoperability and charge performance.
• Behavioral recommendations for devices: Provides recommended device behavior when used with compliant power sources to improve safety and user experience.
• Annexes for reliability and performance: Informative annexes (B, C, D, E) explain USB PD design features that enhance robustness, charging performance concepts (charge rate and power), common use cases, and conformance/market considerations.

Note: IEC 63002 does not replace product‑safety, EMC or energy‑efficiency regulatory requirements - those remain outside its scope.

Practical applications - who uses this standard

• Device manufacturers (notebooks, tablets, smartphones, monitors) integrating USB Type‑C/USB PD charging to ensure cross‑brand compatibility.
• EPS/charger designers and OEMs implementing minimum hardware and communication features for interoperability.
• Test labs and conformity assessors using the reporting parameters and test references in Annex E to validate EPS behavior.
• System integrators and accessory makers (cable and docking station vendors) ensuring end‑to‑end charging reliability for untested combinations of EPS and devices.
• Product managers and procurement teams wanting to expand user convenience through universal chargers.

Related standards and context

• IEC 62680‑1‑3 - USB Type‑C Cable and Connector Specification (mechanical/electrical interface).
• IEC 62680‑1‑2 - USB Power Delivery protocol (power negotiation up to 100 W).
  IEC 63002:2021 replaces the 2016 edition and includes technical revisions to EPS interoperability, added hardware/protection requirements, and new informative annexes clarifying robustness and charging performance.

Keywords: IEC 63002:2021, external power supplies, EPS, USB Type‑C, USB Power Delivery, USB PD, interoperability, charging, IEC 62680, overvoltage protection.

Standards Content (Sample)

IEC 63002 ®
Edition 2.0 2021-05
INTERNATIONAL
STANDARD
colour
inside
Interoperability specifications and communication method for external power
supplies used with computing and consumer electronics devices

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IEC 63002 ®
Edition 2.0 2021-05
INTERNATIONAL
STANDARD
colour
inside
Interoperability specifications and communication method for external power

supplies used with computing and consumer electronics devices

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.020; 35.200 ISBN 978-2-8322-9822-0

– 2 – IEC 63002:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 10
4 EPS interoperability based on USB technologies . 10
4.1 Overview. 10
4.2 General . 10
4.3 USB standard charging summary and interoperability . 12 ®
4.4 USB Type-C Current . 13
4.5 USB Power Delivery (USB PD) . 13
5 External power supply (EPS) specification . 14
5.1 General hardware specification . 14
5.1.1 General . 14
5.1.2 AC input characteristic . 14
5.1.3 Environmental specification . 14
5.1.4 EPS detection . 14
5.2 EPS protection . 15
5.3 Important characteristics of an external power supply . 15
5.3.1 General . 15
5.3.2 Positive identification of a unique power source model . 15
5.3.3 Static characteristics of the external power source performance and
design . 15
5.3.4 Example usage scenarios of enhanced reporting from the power source . 18
Annex A (informative) Open issues related to arbitrary combinations of power source
and device . 21
A.1 EMC, safety, and performance . 21
A.2 Authentication, attestation, and data integrity protection . 21
A.3 Conducted noise from the EPS . 22
Annex B (informative) USB Type-C and USB Power Delivery robustness and
interoperability . 23
B.1 Overview. 23
B.2 USB Type-C Cable and Connector (IEC 62680-1-3) . 23
B.2.1 General . 23
B.2.2 Current capacity and cable identity . 23
B.2.3 Interoperability . 23
B.2.4 Legacy support . 24
B.3 USB Power Delivery (IEC 62680-1-2) . 24
B.3.1 General . 24
B.3.2 Robustness . 24
B.3.3 Error detection and recovery . 25
Annex C (informative) USB charging profiles and device charging performance . 26
C.1 Overview. 26
C.2 USB Type-C and USB PD power capabilities model . 26

C.3 Battery charging performance . 28
C.4 Fixed Supply charging versus PPS charging . 29
Annex D (informative) Common charging interoperability use cases . 30
D.1 General . 30
D.2 Examples of device use cases . 30
D.2.1 General . 30
D.2.2 Smartphone . 30
D.2.3 Higher power computing devices (tablets, notebook computers, etc.) . 30
D.2.4 Other consumer electronics devices (smart watches, electric

toothbrushes, etc.) . 31
D.3 Examples of consumer use cases . 31
Annex E (informative) Conformance and market considerations . 32
E.1 General . 32
E.2 Summary of reported items and test references . 32
E.3 USB-IF Compliance Program [7] . 33
E.4 General regulatory compliance for a power source . 34
E.5 Other considerations for system testing . 35
E.6 After-market firmware updates to power source . 35
Bibliography . 36

Figure 1 – Scope of the identification, communication and control method . 7
Figure 2 – USB EPS charging application model . 11
Figure 3 – Measurement of holdup time . 16
Figure C.1 – Source power rules for Fixed Supply operation . 27
Figure C.2 – Source power rules for PPS operation . 28
Figure C.3 – 30 W PDP PPS example . 28
Figure E.1 – USB certified charger logos . 34

Table 1 – USB standard power modes and charging interoperability . 12
Table E.1 – Summary of reported parameters from USB PD power source and their
test references . 32
Table E.2 – Examples of current regulations and standards in the US and EU
applicable to external power supplies used with devices (non-exhaustive list) . 34

– 4 – IEC 63002:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INTEROPERABILITY SPECIFICATIONS AND COMMUNICATION METHOD
FOR EXTERNAL POWER SUPPLIES USED WITH COMPUTING AND
CONSUMER ELECTRONICS DEVICES
FOREWORD
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This document has been prepared by technical area 18: Multimedia home systems and
applications for end-user networks, of IEC technical committee 100: Audio, video and
multimedia systems and equipment. It is an International Standard.
This second edition cancels and replaces the first edition published in 2016. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) title is changed from Identification and communication interoperability method for external
power supplies used with portable computing devices;
b) Clause 4, EPS interoperability based on USB technologies, is added;
c) Clause 5, EPS specification, adds hardware and protection requirements; overvoltage
protection is changed from optional to normative;

d) Annex B and Annex C are added, providing an explanation of the design features in USB
Power Delivery that enhance reliability and an explanation of the concepts of charge rate
and power.
The text of this International Standard is based on the following documents:
CDV Report on voting
100/3463/CDV 100/3540B/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
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– 6 – IEC 63002:2021 © IEC 2021
INTRODUCTION
The objective of this document is to enable common charging interoperability of external power
supplies (EPSs) used with the increasing variety of computing and consumer electronics
devices that implement IEC 62680-1-3 (USB Type-C® Cable and Connector Specification)
and IEC 62680-1-2 (USB Power Delivery). Broad market adoption of this document is expected
to make a significant contribution to the global goals of consumer convenience and re-usability
of power supplies by expanding common charging interoperability across different product
categories while preserving backwards compatibility with the installed base of billions of
IEC 62680 compliant devices worldwide.
This document specifies the minimum technical requirements for interoperability and includes
recommendations for EPS functionality when used with computing and electronics devices. The
approach taken by this document, focused on enabling common charging interoperability, can
allow manufacturers to innovate in aspects such as technical design, system performance, and
energy efficiency. Furthermore, common charging interoperability enables manufacturers to
design specific EPSs that match the requirements of target devices (functionality, cost, etc.)
and use cases, while at the same time enabling consumers to use the EPS for charging other
IEC 62680 compliant devices, across various product types.
IEC 62680-1-3 adoption is well underway in global markets for a wide range of devices using
as much as 100 W, including notebook computers, tablets, smartphones, small form-factor
desktop computers, and other consumer electronics devices. This document enables the
reporting of the identity and power characteristics of power sources (EPSs and other Sources)
supported by IEC 62680-1-3 (USB Type-C) and specifies interoperability guidelines when using
IEC 62680-1-2 (USB Power Delivery). The method for identification of a specific power source
can enable equipment manufacturers to ensure compliant operation using these specifications
and promotes data communication that can be used by the device to predict and mitigate
interoperability concerns when an unfamiliar or incompatible EPS is connected to the device.
EPS power delivery applications can in the future extend beyond 100 W given updates to
IEC 62680 that appropriately address the needs of higher-power products in the computing and
consumer device market.
This document also provides important information regarding consumer safety, system
reliability as well as relevant global standards and regulatory compliance.
Other international and regional standards, and government policies for "universal" or "common
power adapters" that reference this document are expected to take into account open technical
and regulatory compliance issues that are associated with untested or arbitrary combinations
of EPSs and devices such as those identified in Annex A, as well as the limitations and issues
with approaches to define "common chargers" in meeting market needs. For clarity, this
document focuses on interoperability specifications in order to support global industry in
developing safe, convenient, environmentally conscious, and end-to-end interoperable charging
solutions that meet regulatory compliance and market requirements.

___________
USB4™ and USB Type-C® are trademarks of the Universal Serial Bus Implementers Forum (USB-IF). This
information is given for the convenience of users of this document and does not constitute an endorsement by
IEC.
INTEROPERABILITY SPECIFICATIONS AND COMMUNICATION METHOD
FOR EXTERNAL POWER SUPPLIES USED WITH COMPUTING AND
CONSUMER ELECTRONICS DEVICES
1 Scope
This document defines common charging interoperability guidelines for power sources (external
power supplies (EPSs) and other Sources) used with computing and consumer electronics
devices that implement IEC 62680-1-3 (USB Type-C Cable and Connector Specification).
This document defines normative requirements for an EPS to ensure interoperability; in
particular, it specifies the data communicated from a power source to a device (Figure 1) and
certain safety elements of the EPS, cable, and device. While the requirements focus of this
document is on the EPS and the behaviour at its USB Type-C connector interface, it is also
important to comprehend cable assembly and device capabilities and behaviours in order to
assure end-to-end charging interoperability. This document does not apply to all design aspects
of an EPS. This document does not specify regulatory compliance requirements for aspects
such as product safety, EMC or energy efficiency.

Figure 1 – Scope of the identification, communication and control method
This document provides recommendations for the behaviour of a device when used with a power
source compliant with this document. It specifies the minimum hardware specification for an
EPS implementing IEC 62680-1-3. This document also specifies the data objects used by a
charging system utilizing IEC 62680-1-2 to understand the identity, design and performance
characteristics, and operating status of an external power supply. IEC 62680-1-2 focuses on
power delivery applications ranging to 100 W for a variety of computing and consumer
electronics devices including notebook computers, tablets, smartphones, small form-factor
desktops, monitor displays and other related multimedia devices.
This document relies on established mechanical and electrical specifications, and
communication protocols specified by IEC 62680-1-2 and IEC 62680-1-3. These specifications
support methods for establishing the best performing interoperability between untested
combinations of EPS and devices with the aim of improving consumer satisfaction.

– 8 – IEC 63002:2021 © IEC 2021
Information describing the USB charging interoperability model, overview of USB Type-C and
USB Power Delivery specifications, and factors for charging performance are also provided to
support implementation of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60950-1, Information technology equipment – Safety – Part 1: General requirements
IEC 60990, Methods of measurement of touch current and protective conductor current
IEC 62368-1:2018, Audio/video, information and communication technology equipment – Part 1:
Safety requirements
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 62680-1-2:2021, Universal Serial Bus interfaces for data and power – Part 1-2: Common
components – USB Power Delivery specification
IEC 62680-1-3, Universal Serial Bus interfaces for data and power – Part 1-3: Common
components – USB Type-C Cable and Connector Specification
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
vendor identification
VID
unique 16-bit unsigned value assigned by the USB-IF to a given vendor
3.1.2
power source
power supply
Source
device designed to comply with IEC 62680-1-2 that supplies power over V
BUS
EXAMPLE A USB connector on a PC, laptop computer, vehicle, AC outlet, docking station, battery pack, or EPS.

3.1.3
Sink
power sink
device designed to comply with IEC 62680-1-2 that receives and consumes power over V
BUS
EXAMPLE A computing device.
Note 1 to entry: Sometimes referred to as the device.
3.1.4
external power supply
EPS
power source contained in a separate physical enclosure external to the device casing and
designed to convert mains power supply to lower DC voltage(s) for the purpose of powering the
device
EXAMPLE A charging block.
3.1.5
Programmable Power Supply
PPS
optional capability in IEC 62680-1-2 where a device (Sink) can adaptively adjust the EPS
(Source) output voltage in small increments and set maximum current within its advertised
range
3.1.6
Fixed Supply
power source whose output voltage is regulated
Note 1 to entry: Standardized voltages in IEC 62680-1-2:2021 are 5 V, 9 V, 15 V and 20 V.
3.1.7
USB PD power
PDP
nominal power capacity of the charger defined by IEC 62680-1-2 for use to indicate to
consumers
Note 1 to entry: The PDP rating is indicated both on the USB charger certification logo and within the USB PD
source capabilities advertisement to the Sink. For any given PDP rating, the minimum capabilities in terms of
supported voltages and currents are deterministic, as defined in IEC 62680-1-2.
3.1.8
charging cable
cable used between the EPS and device to be charged
Note 1 to entry: The cable connection to the EPS is a USB Type-C plug in accordance with IEC 62680-1-3. The
cable connection to the device can be either a USB Type-C plug, a legacy USB plug (e.g. USB Micro-B in accordance
with IEC 62680-2-2), or a non-USB device-specific connection (either permanent or detachable). Charging cables
can be application-specific to enable interoperability between the USB Type-C-based EPS defined by this document
and both existing and future devices and including devices that are not able to accommodate USB Type-C receptacles,
e.g. smart watches.
3.1.9
captive cable
permanently attached cable
cable that has a USB Type-C plug on one end and is either hard-wired into a device on the
other end or has a device-specific plug on the other end
Note 1 to entry: When a device-specific plug is used on one end, the cable can be detachable in a physical sense
but is considered "functionally captive" to the device given it does not use a USB-defined connector on the device
end but otherwise functions as a USB device. This definition has remained the USB definition since it was originally
specified in IEC 62680-2-1 (USB 2.0).

– 10 – IEC 63002:2021 © IEC 2021
3.2 Abbreviated terms
AC alternating current
CC configuration channel
CRC cyclic redundancy check
DC direct current
EMC electromagnetic compatibility
EMI electromagnetic interference
EPS external power supply
IoC contracted operating current
LPS limited power source
OEM original equipment manufacturer
OVP overvoltage protection
PDO power data object
PFC power factor correction
PDP USB PD Power
PID product identification
PPS Programmable Power Supply
VAC volts alternating current
USB universal serial bus
USB PD universal serial bus power delivery
USB-IF Universal Serial Bus Implementers Forum
VID vendor identification
4 EPS interoperability based on USB technologies
4.1 Overview
Clause 4 describes the USB common charging interoperability model and provides a summary
of the USB Type-C and USB Power Delivery technologies specified in IEC 62680‑1‑3 and
IEC 62680-1-2, respectively.
4.2 General
Since its introduction over 20 years ago, USB charging technology has consistently provided
5 V DC power and relied on a common USB Standard-A connector on the power source. When
used with defined legacy cables and adapters, USB Type-C-based power sources, including
those that source higher voltages, remain electrically and mechanically interoperable with
previous generation USB devices, while enabling new capabilities for devices that have evolved
to align with these new capabilities.
Figure 2 illustrates the USB EPS charging application model consisting of the EPS (Source)
with a USB Type-C receptacle, the device to be charged (Sink) and the charging cable
connecting the device to the EPS. This model also enables compatibility with devices that are
based on legacy USB connectors, have a permanently attached cable, or use a cable that is
device specific. Several usage examples demonstrating end-to-end charging interoperability
based on this comprehensive model are presented in Annex D.

Figure 2 – USB EPS charging application model
In Figure 2, the last two devices illustrated align with the USB definition of a captive cable
assembly – supporting these device usage configurations enables USB to support charging
interoperability across a wider variety of applications that implement a non-USB standard
receptacle or connector for any number of usage or design reasons but otherwise function as
USB devices. Examples of these applications include a smartphone that has a non-USB
receptacle and a USB power bank that incorporates a permanently attached cable for user
convenience.
This charging model for USB Type-C is fundamentally the same as the previous generation
USB charging model consisting of an EPS with a USB Standard-A receptacle which is the basis
for charging interoperability specified in IEC 62684 [1] . This USB Standard-A EPS model will
continue to be supported even with new devices which are based on USB Type-C receptacles
since USB-defined transition cables and adapters are readily available to enable basic charging
interoperability.
___________
Numbers in square brackets refer to the Bibliography.

– 12 – IEC 63002:2021 © IEC 2021
4.3 USB standard charging summary and interoperability
Table 1 summarizes the standard charging modes defined by USB specifications, including the
applicable USB connectors for each of the defined power modes. While the USB Type-C
connector is functionally compatible with all existing USB power options, the older USB
Standard-A and USB Micro-B cannot support some advanced USB Type-C dedicated power
modes – these power modes are indicated in the lower portion of the table. As read down the
table rows, each subsequent power mode is required to support backward-compatibility with all
of the power modes above it – in this way, USB-defined interoperability between newer power
sources is readily assured with older power sinks given that an appropriate cable or adapter is
used (as indicated in the Interoperability column and the table notes).
Table 1 – USB standard power modes and charging interoperability
IEC Power Applicable receptacle
Voltage Current Interoperability
specification mode connectors
a
IEC 62680-2-1 USB Standard-A (Source) 5 V 0,5 A Forward compatibility
USB 2.0
b
[2] supported using USB
USB Micro-B (Sink)
Standard-A to USB
USB Type-C
IEC 62680-2-2
Type-C cables or USB
(Source or Sink)
[3]
Micro-B to USB Type-C
adapters.
IEC 62680-2-3
[4]
Backward compatibility
supported using USB
IEC 62680-3-1 USB 3.0, USB Standard-A (Source) 5 V 0,9 A
Type-C to USB Micro-B
b
[5] USB 3.1,
USB Micro-B (Sink)
cables.
a
USB 3.2 USB Type-C
(Source or Sink)
IEC 62684 [1] USB BC USB Standard-A (Source) 5 V Up to 1,5 A
c
1.2
USB Micro-B (Sink)
USB Type-C
(Source or Sink)
IEC 62680-1-3 USB USB Type-C 5 V 1,5 A Functionally compatible
Type-C (Source or Sink) with USB BC 1.2
Current at compatible Sinks up to
1,5 A 1,5 A.
Backward compatibility
in BC 1.2 mode
supported using USB
Type-C to USB Micro-B
cables.
IEC 62680-1-3 USB USB Type-C 5 V 3 A Functionally compatible
Type-C (Source or Sink) with USB BC 1.2
Current at compatible Sinks up to
3,0 A 1,5 A
Backward compatibility
in BC 1.2 mode
supported using USB
Type-C to USB Micro-B
cables.
IEC 62680-1-2 USB USB Type-C Configurable Configurable USB4™ uses USB PD
d
Power (Source or Sink) up to 20 V as its power mode.
up to 5 A
Delivery
(USB PD)
a
These specifications do not explicitly define charging support requirements. When USB data ports also support
charging, the current capabilities of these ports are typically based on what is defined for a USB port operating
in its high power configured state, i.e. 500 mA for USB 2.0.
b
While less common, USB Standard-B and USB Mini-B are also applicable for a Sink.
c
While less common, USB Micro-AB is also applicable for a Sink.
d
Power transfer over 3 A requires use of an electronically marked 5 A cable if EPS is a detachable cable design.

Annex B provides further detail on the robustness and interoperability characteristics of USB
Type-C and USB Power Delivery solutions. ®
4.4 USB Type-C Current
The USB Type-C Current power mode is based on a regulated 5 V power source with up to 3 A
operation. This power mode uses a simple analogue method over the USB Type-C
Configuration Channel (CC) interface for a Source to advertise its available current to a Sink.
A USB Type-C Source may advertise default USB Type-C Current (500 mA or 900 mA, based
on the version of the USB port and cable), USB Type-C Current at 1,5 A or USB Type-C Current
at 3 A. An EPS shall indicate USB BC 1.2 compatibility on the port such that a device (Sink)
that doesn't recognize USB Type-C Current modes but is compatible with USB BC 1.2 can still
draw 1,5 A.
4.5 USB Power Delivery (USB PD)
Power transfer at other than 5 V or over 3 A shall comply with IEC 62680-1-2 (USB Power
Delivery). USB Power Delivery standardizes the discovery, configuration and functional
operation of more capable USB Type-C power sources and battery chargers. The USB PD
protocol, operating as a digital communication over the USB Type-C CC interface, enables a
predictable, reliable user experience based on a common set of robust mechanisms and
communication exchanges between the USB Source and the Sink. The comprehensive set of
power delivery methods supported by the USB PD protocol enables a broad range of battery
charging approaches and profiles that are specific to the design and operation of the device
being charged (the Sink) – this enables device designs to evolve and innovate while the
capabilities of a USB PD-based charger can remain a constant.
USB PD protocol is used to provide system control, error detection and handshaking. The four
required steps for enabling power delivery are:
1) Source offers its capabilities.
2) Sink requests from the offered capabilities.
3) Source accepts the request.
4) Source indicates that it is ready to provide power.
USB PD protocol can also be used for reporting the status (overcurrent protection,
overtemperature protection, overvoltage protection, etc.) of the Source.
The USB PD protocol specifies two principal modes of power transfer that can be implemented
by a USB PD Source.
– Fixed Supply operation: Provides a set of selectable fixed voltage and current combinations.
IEC 62680-1-2 defines voltages that include 5 V, 9 V, 15 V and 20 V. The Source can offer
as much as 5 A, depending on the cable current rating and selected voltage.
– Programmable Power Supply (PPS) operation: Provides granular control of voltage or a
maximum regulated source current limit. In PPS mode, the integrity of the connection is
continually monitored and absence of a handshake message between Source or Sink forces
the connection to lower safe power level. PPS places the burden of regulation in the Source
instead of in the Sink, allowing the Sink to better manage thermal rise during higher power
battery charging, which aids in lowering touch temperatures. Standard-defined voltage
ranges for PPS PDOs are nominally aligned with the defined Fixed Supply PDOs (5 V, 9 V,
15 V and 20 V) with a range minimum of 3,3 V and maximum of 5,9 V, 11 V, 16 V and 21 V,
respectively. The Source could offer as much as 5 A, depending on the cable current rating
and selected voltage.
– 14 – IEC 63002:2021 © IEC 2021
By default, all USB Type-C EPS are required to output power over a USB connector as a Fixed
Supply capable of 5 V up to 1,5 A. USB Type-C EPS chargers can also support USB PD.
USB Type-C EPSs that implement USB PD fall into one of two defined categories: a USB
charger supporting only Fixed Supply operation, or a USB charger supporting both Fixed Supply
and PPS operation. For both categories, charger products are required to indicate a user-visible
USB PD Power (PDP) rating, which dictates the minimum set of available voltage and current
ranges that a charger supports. The PDP rating, for example, which is expressed in watts
ranging from 15 W to 100 W, eases user experience by matching chargers' capabilities with
device needs and also indicates expected charging performance. For any given PDP rating, the
capabilities associated with all lower PDP ratings are required in the charger in order to assure
safe downward compatibility with lower-power devices. See Annex C for more information.
The USB Type-C and USB Power Delivery specifications will continue to evolve as data
performance and power needs increase over time, supporting new product designs and
technology innovations. While the USB PD protocol defines advertisement mechanisms to
articulate power source capabilities of up to 50 V and 10 A, the USB Type-C connector has a
practical continuous capability of 5 A.
5 External power supply (EPS) specification
5.1 General hardware specification
5.1.1 General
An EPS compliant with this document shall provide power on at least one USB Type-C
receptacle compliant with IEC 62680-1-3:2021. A power cable assembly, supplied with EPS
compliant with this document shall comply with IEC 62680-1-3:2021, Clause 3, mechanical and
electrical specifications for cable assemblies and connectors including USB Type-C standard
cable assemblies, captive cable assemblies and legacy cable assemblies.
5.1.2 AC input characteristic
The EPS AC input shall operate over the following range.
1) Voltage range: the rated input voltage range covers the range 100 V to 240 V.
2) Frequency: 50 Hz to 60 Hz.
5.1.3 Environmental specification
The EPS operational environmental range, over which the DC output characteristics shall be
maintained, shall be the following.
1) Temperature range: 0 °C to +35 °C.
2) Relative humidity: up to 90 %.
5.1.4 EPS detection
To enable a device to detect that it is connected to an EPS, the EPS shall meet the charging
port requirements for a Dedicated Charging Port as defined in IEC 62680-1-1 and
IEC 62680‑1‑3.
An EPS compliant with this document shall by default supply 5 V with a minimum current
capacity of 1,5 A.
An EPS may also provide voltages other than 5 V and currents greater than 1,5 A. These power
sources shall comply with IEC 62680-1-2 and use methods for power reporting compliant with
IEC 62680-1-3.
5.2 EPS protection
An EPS shall comply with IEC 62368-1 requirements for ES1.
EPS delivered power on V shall comply with PS2 or Clause Q.1 of IEC 62368-1:2018, where
BUS
it is unknown if the Sink is likely to comply with the requirements for PS3 operation as specified
in IEC 62368-1.
EPS maximum available output current under normal operating and single fault conditions shall
not exceed 6,5 A for more than 5 s.
An EPS shall have overvoltage protection, whereby a detected voltage threshold of no more
than 130 % of contracted V (or 6,5 V, whichever is greater) leads to an overvoltage
BUS
protection event, whereby a voltage above the threshold value shall interrupt output current
within 250 ms.
5.3 Important characteristics of an external power supply
5.3.1 General
Untested combinations of a power source and a device can benefit from reporting of the power
source identity, characteristics, and status to the device. The device is recommended to use
such information to confirm operation of the power source, modify its operation with the power
source, or to reject usage of the power source. Annex E summarizes the identification and static
parameters reported by a power source to a device when the USB Type-C Source has USB PD
capability.
5.3.2 Positive identification of a unique power source model
The specific product identity number of the power source can be recognized by the device to
allow optimized and compliant operation. The device shall be able to distinguish whether the
power source is generic or known.
Hardware revision can affect the quality and performance of the power source. Reporting the
date of manufacture or a hardware version allows the device to identify a power source whose
performance characteristics can vary.
The power source shall identify its vendor. The power source shall also report a unique model
identity of the power source. The Source can report OEM specific information that helps identify
the hardware version of the model of the power source or serial number. The contents of the
OEM specific identifier and hardware version are not standardized by this document but can be
read by any device.
IEC 62680-1-2 enables reporting of the vendor identity (VID) and product identity (PID) in the
Discover_Identity and Source Capabilities Extended commands. Firmware and Hardware
versions and USB IF certification ID can be communicated in the Source and Sink Extended
Capabilities Data blocks. Other OEM defined identification can be provided in the
Manufacturer_Info command.
5.3.3 Static characteristics of the external power source performance and design
5.3.3.1 General
IEC 62680-1-2 enables identification of the voltage and power capabilities of the power source
as well as some key electrical parameters for voltage tolerance. This document extends the
range of the power source capabilities that are communicated to the device.

– 16 – IEC 63002:2021 © IEC 2021
5.3.3.2 Load current step performance of the power source
The power consumption of a device can change dynamically. The ability of the power source to
regulate its voltage output can be important if the device is sensitive to flu
...

IEC 63002 ®
Edition 2.0 2021-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
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Interoperability specifications and communication method for external power
supplies used with computing and consumer electronics devices

Spécifications d'interopérabilité et méthode de communication pour les
alimentations externes utilisées avec les dispositifs informatiques et les
dispositifs électroniques grand public

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IEC 63002 ®
Edition 2.0 2021-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Interoperability specifications and communication method for external power

supplies used with computing and consumer electronics devices

Spécifications d'interopérabilité et méthode de communication pour les

alimentations externes utilisées avec les dispositifs informatiques et les

dispositifs électroniques grand public

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.020; 35.200 ISBN 978-2-8322-1042-8

– 2 – IEC 63002:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 10
4 EPS interoperability based on USB technologies . 10
4.1 Overview. 10
4.2 General . 10
4.3 USB standard charging summary and interoperability . 12 ®
4.4 USB Type-C Current . 13
4.5 USB Power Delivery (USB PD) . 13
5 External power supply (EPS) specification . 14
5.1 General hardware specification . 14
5.1.1 General . 14
5.1.2 AC input characteristic . 14
5.1.3 Environmental specification . 14
5.1.4 EPS detection . 14
5.2 EPS protection . 15
5.3 Important characteristics of an external power supply . 15
5.3.1 General . 15
5.3.2 Positive identification of a unique power source model . 15
5.3.3 Static characteristics of the external power source performance and
design . 15
5.3.4 Example usage scenarios of enhanced reporting from the power source . 18
Annex A (informative) Open issues related to arbitrary combinations of power source
and device . 21
A.1 EMC, safety, and performance . 21
A.2 Authentication, attestation, and data integrity protection . 21
A.3 Conducted noise from the EPS . 22
Annex B (informative) USB Type-C and USB Power Delivery robustness and
interoperability . 23
B.1 Overview. 23
B.2 USB Type-C Cable and Connector (IEC 62680-1-3) . 23
B.2.1 General . 23
B.2.2 Current capacity and cable identity . 23
B.2.3 Interoperability . 23
B.2.4 Legacy support . 24
B.3 USB Power Delivery (IEC 62680-1-2) . 24
B.3.1 General . 24
B.3.2 Robustness . 24
B.3.3 Error detection and recovery . 25
Annex C (informative) USB charging profiles and device charging performance . 26
C.1 Overview. 26
C.2 USB Type-C and USB PD power capabilities model . 26

C.3 Battery charging performance . 28
C.4 Fixed Supply charging versus PPS charging . 29
Annex D (informative) Common charging interoperability use cases . 30
D.1 General . 30
D.2 Examples of device use cases . 30
D.2.1 General . 30
D.2.2 Smartphone . 30
D.2.3 Higher power computing devices (tablets, notebook computers, etc.) . 30
D.2.4 Other consumer electronics devices (smart watches, electric

toothbrushes, etc.) . 31
D.3 Examples of consumer use cases . 31
Annex E (informative) Conformance and market considerations . 32
E.1 General . 32
E.2 Summary of reported items and test references . 32
E.3 USB-IF Compliance Program [7] . 33
E.4 General regulatory compliance for a power source . 34
E.5 Other considerations for system testing . 35
E.6 After-market firmware updates to power source . 35
Bibliography . 36

Figure 1 – Scope of the identification, communication and control method . 7
Figure 2 – USB EPS charging application model . 11
Figure 3 – Measurement of holdup time . 16
Figure C.1 – Source power rules for Fixed Supply operation . 27
Figure C.2 – Source power rules for PPS operation . 28
Figure C.3 – 30 W PDP PPS example . 28
Figure E.1 – USB certified charger logos . 34

Table 1 – USB standard power modes and charging interoperability . 12
Table E.1 – Summary of reported parameters from USB PD power source and their
test references . 32
Table E.2 – Examples of current regulations and standards in the US and EU
applicable to external power supplies used with devices (non-exhaustive list) . 34

– 4 – IEC 63002:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INTEROPERABILITY SPECIFICATIONS AND COMMUNICATION METHOD
FOR EXTERNAL POWER SUPPLIES USED WITH COMPUTING AND
CONSUMER ELECTRONICS DEVICES
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared by technical area 18: Multimedia home systems and
applications for end-user networks, of IEC technical committee 100: Audio, video and
multimedia systems and equipment. It is an International Standard.
This second edition cancels and replaces the first edition published in 2016. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) title is changed from Identification and communication interoperability method for external
power supplies used with portable computing devices;
b) Clause 4, EPS interoperability based on USB technologies, is added;
c) Clause 5, EPS specification, adds hardware and protection requirements; overvoltage
protection is changed from optional to normative;

d) Annex B and Annex C are added, providing an explanation of the design features in USB
Power Delivery that enhance reliability and an explanation of the concepts of charge rate
and power.
The text of this International Standard is based on the following documents:
CDV Report on voting
100/3463/CDV 100/3540B/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
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• reconfirmed,
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• 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.

– 6 – IEC 63002:2021 © IEC 2021
INTRODUCTION
The objective of this document is to enable common charging interoperability of external power
supplies (EPSs) used with the increasing variety of computing and consumer electronics
devices that implement IEC 62680-1-3 (USB Type-C® Cable and Connector Specification)
and IEC 62680-1-2 (USB Power Delivery). Broad market adoption of this document is expected
to make a significant contribution to the global goals of consumer convenience and re-usability
of power supplies by expanding common charging interoperability across different product
categories while preserving backwards compatibility with the installed base of billions of
IEC 62680 compliant devices worldwide.
This document specifies the minimum technical requirements for interoperability and includes
recommendations for EPS functionality when used with computing and electronics devices. The
approach taken by this document, focused on enabling common charging interoperability, can
allow manufacturers to innovate in aspects such as technical design, system performance, and
energy efficiency. Furthermore, common charging interoperability enables manufacturers to
design specific EPSs that match the requirements of target devices (functionality, cost, etc.)
and use cases, while at the same time enabling consumers to use the EPS for charging other
IEC 62680 compliant devices, across various product types.
IEC 62680-1-3 adoption is well underway in global markets for a wide range of devices using
as much as 100 W, including notebook computers, tablets, smartphones, small form-factor
desktop computers, and other consumer electronics devices. This document enables the
reporting of the identity and power characteristics of power sources (EPSs and other Sources)
supported by IEC 62680-1-3 (USB Type-C) and specifies interoperability guidelines when using
IEC 62680-1-2 (USB Power Delivery). The method for identification of a specific power source
can enable equipment manufacturers to ensure compliant operation using these specifications
and promotes data communication that can be used by the device to predict and mitigate
interoperability concerns when an unfamiliar or incompatible EPS is connected to the device.
EPS power delivery applications can in the future extend beyond 100 W given updates to
IEC 62680 that appropriately address the needs of higher-power products in the computing and
consumer device market.
This document also provides important information regarding consumer safety, system
reliability as well as relevant global standards and regulatory compliance.
Other international and regional standards, and government policies for "universal" or "common
power adapters" that reference this document are expected to take into account open technical
and regulatory compliance issues that are associated with untested or arbitrary combinations
of EPSs and devices such as those identified in Annex A, as well as the limitations and issues
with approaches to define "common chargers" in meeting market needs. For clarity, this
document focuses on interoperability specifications in order to support global industry in
developing safe, convenient, environmentally conscious, and end-to-end interoperable charging
solutions that meet regulatory compliance and market requirements.

___________
USB4™ and USB Type-C® are trademarks of the Universal Serial Bus Implementers Forum (USB-IF). This
information is given for the convenience of users of this document and does not constitute an endorsement by
IEC.
INTEROPERABILITY SPECIFICATIONS AND COMMUNICATION METHOD
FOR EXTERNAL POWER SUPPLIES USED WITH COMPUTING AND
CONSUMER ELECTRONICS DEVICES
1 Scope
This document defines common charging interoperability guidelines for power sources (external
power supplies (EPSs) and other Sources) used with computing and consumer electronics
devices that implement IEC 62680-1-3 (USB Type-C Cable and Connector Specification).
This document defines normative requirements for an EPS to ensure interoperability; in
particular, it specifies the data communicated from a power source to a device (Figure 1) and
certain safety elements of the EPS, cable, and device. While the requirements focus of this
document is on the EPS and the behaviour at its USB Type-C connector interface, it is also
important to comprehend cable assembly and device capabilities and behaviours in order to
assure end-to-end charging interoperability. This document does not apply to all design aspects
of an EPS. This document does not specify regulatory compliance requirements for aspects
such as product safety, EMC or energy efficiency.

Figure 1 – Scope of the identification, communication and control method
This document provides recommendations for the behaviour of a device when used with a power
source compliant with this document. It specifies the minimum hardware specification for an
EPS implementing IEC 62680-1-3. This document also specifies the data objects used by a
charging system utilizing IEC 62680-1-2 to understand the identity, design and performance
characteristics, and operating status of an external power supply. IEC 62680-1-2 focuses on
power delivery applications ranging to 100 W for a variety of computing and consumer
electronics devices including notebook computers, tablets, smartphones, small form-factor
desktops, monitor displays and other related multimedia devices.
This document relies on established mechanical and electrical specifications, and
communication protocols specified by IEC 62680-1-2 and IEC 62680-1-3. These specifications
support methods for establishing the best performing interoperability between untested
combinations of EPS and devices with the aim of improving consumer satisfaction.

– 8 – IEC 63002:2021 © IEC 2021
Information describing the USB charging interoperability model, overview of USB Type-C and
USB Power Delivery specifications, and factors for charging performance are also provided to
support implementation of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60950-1, Information technology equipment – Safety – Part 1: General requirements
IEC 60990, Methods of measurement of touch current and protective conductor current
IEC 62368-1:2018, Audio/video, information and communication technology equipment – Part 1:
Safety requirements
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 62680-1-2:2021, Universal Serial Bus interfaces for data and power – Part 1-2: Common
components – USB Power Delivery specification
IEC 62680-1-3, Universal Serial Bus interfaces for data and power – Part 1-3: Common
components – USB Type-C Cable and Connector Specification
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
vendor identification
VID
unique 16-bit unsigned value assigned by the USB-IF to a given vendor
3.1.2
power source
power supply
Source
device designed to comply with IEC 62680-1-2 that supplies power over V
BUS
EXAMPLE A USB connector on a PC, laptop computer, vehicle, AC outlet, docking station, battery pack, or EPS.

3.1.3
Sink
power sink
device designed to comply with IEC 62680-1-2 that receives and consumes power over V
BUS
EXAMPLE A computing device.
Note 1 to entry: Sometimes referred to as the device.
3.1.4
external power supply
EPS
power source contained in a separate physical enclosure external to the device casing and
designed to convert mains power supply to lower DC voltage(s) for the purpose of powering the
device
EXAMPLE A charging block.
3.1.5
Programmable Power Supply
PPS
optional capability in IEC 62680-1-2 where a device (Sink) can adaptively adjust the EPS
(Source) output voltage in small increments and set maximum current within its advertised
range
3.1.6
Fixed Supply
power source whose output voltage is regulated
Note 1 to entry: Standardized voltages in IEC 62680-1-2:2021 are 5 V, 9 V, 15 V and 20 V.
3.1.7
USB PD power
PDP
nominal power capacity of the charger defined by IEC 62680-1-2 for use to indicate to
consumers
Note 1 to entry: The PDP rating is indicated both on the USB charger certification logo and within the USB PD
source capabilities advertisement to the Sink. For any given PDP rating, the minimum capabilities in terms of
supported voltages and currents are deterministic, as defined in IEC 62680-1-2.
3.1.8
charging cable
cable used between the EPS and device to be charged
Note 1 to entry: The cable connection to the EPS is a USB Type-C plug in accordance with IEC 62680-1-3. The
cable connection to the device can be either a USB Type-C plug, a legacy USB plug (e.g. USB Micro-B in accordance
with IEC 62680-2-2), or a non-USB device-specific connection (either permanent or detachable). Charging cables
can be application-specific to enable interoperability between the USB Type-C-based EPS defined by this document
and both existing and future devices and including devices that are not able to accommodate USB Type-C receptacles,
e.g. smart watches.
3.1.9
captive cable
permanently attached cable
cable that has a USB Type-C plug on one end and is either hard-wired into a device on the
other end or has a device-specific plug on the other end
Note 1 to entry: When a device-specific plug is used on one end, the cable can be detachable in a physical sense
but is considered "functionally captive" to the device given it does not use a USB-defined connector on the device
end but otherwise functions as a USB device. This definition has remained the USB definition since it was originally
specified in IEC 62680-2-1 (USB 2.0).

– 10 – IEC 63002:2021 © IEC 2021
3.2 Abbreviated terms
AC alternating current
CC configuration channel
CRC cyclic redundancy check
DC direct current
EMC electromagnetic compatibility
EMI electromagnetic interference
EPS external power supply
IoC contracted operating current
LPS limited power source
OEM original equipment manufacturer
OVP overvoltage protection
PDO power data object
PFC power factor correction
PDP USB PD Power
PID product identification
PPS Programmable Power Supply
VAC volts alternating current
USB universal serial bus
USB PD universal serial bus power delivery
USB-IF Universal Serial Bus Implementers Forum
VID vendor identification
4 EPS interoperability based on USB technologies
4.1 Overview
Clause 4 describes the USB common charging interoperability model and provides a summary
of the USB Type-C and USB Power Delivery technologies specified in IEC 62680‑1‑3 and
IEC 62680-1-2, respectively.
4.2 General
Since its introduction over 20 years ago, USB charging technology has consistently provided
5 V DC power and relied on a common USB Standard-A connector on the power source. When
used with defined legacy cables and adapters, USB Type-C-based power sources, including
those that source higher voltages, remain electrically and mechanically interoperable with
previous generation USB devices, while enabling new capabilities for devices that have evolved
to align with these new capabilities.
Figure 2 illustrates the USB EPS charging application model consisting of the EPS (Source)
with a USB Type-C receptacle, the device to be charged (Sink) and the charging cable
connecting the device to the EPS. This model also enables compatibility with devices that are
based on legacy USB connectors, have a permanently attached cable, or use a cable that is
device specific. Several usage examples demonstrating end-to-end charging interoperability
based on this comprehensive model are presented in Annex D.

Figure 2 – USB EPS charging application model
In Figure 2, the last two devices illustrated align with the USB definition of a captive cable
assembly – supporting these device usage configurations enables USB to support charging
interoperability across a wider variety of applications that implement a non-USB standard
receptacle or connector for any number of usage or design reasons but otherwise function as
USB devices. Examples of these applications include a smartphone that has a non-USB
receptacle and a USB power bank that incorporates a permanently attached cable for user
convenience.
This charging model for USB Type-C is fundamentally the same as the previous generation
USB charging model consisting of an EPS with a USB Standard-A receptacle which is the basis
for charging interoperability specified in IEC 62684 [1] . This USB Standard-A EPS model will
continue to be supported even with new devices which are based on USB Type-C receptacles
since USB-defined transition cables and adapters are readily available to enable basic charging
interoperability.
___________
Numbers in square brackets refer to the Bibliography.

– 12 – IEC 63002:2021 © IEC 2021
4.3 USB standard charging summary and interoperability
Table 1 summarizes the standard charging modes defined by USB specifications, including the
applicable USB connectors for each of the defined power modes. While the USB Type-C
connector is functionally compatible with all existing USB power options, the older USB
Standard-A and USB Micro-B cannot support some advanced USB Type-C dedicated power
modes – these power modes are indicated in the lower portion of the table. As read down the
table rows, each subsequent power mode is required to support backward-compatibility with all
of the power modes above it – in this way, USB-defined interoperability between newer power
sources is readily assured with older power sinks given that an appropriate cable or adapter is
used (as indicated in the Interoperability column and the table notes).
Table 1 – USB standard power modes and charging interoperability
IEC Power Applicable receptacle
Voltage Current Interoperability
specification mode connectors
a
IEC 62680-2-1 USB Standard-A (Source) 5 V 0,5 A Forward compatibility
USB 2.0
b
[2] supported using USB
USB Micro-B (Sink)
Standard-A to USB
USB Type-C
IEC 62680-2-2
Type-C cables or USB
(Source or Sink)
[3]
Micro-B to USB Type-C
adapters.
IEC 62680-2-3
[4]
Backward compatibility
supported using USB
IEC 62680-3-1 USB 3.0, USB Standard-A (Source) 5 V 0,9 A
Type-C to USB Micro-B
b
[5] USB 3.1,
USB Micro-B (Sink)
cables.
a
USB 3.2 USB Type-C
(Source or Sink)
IEC 62684 [1] USB BC USB Standard-A (Source) 5 V Up to 1,5 A
c
1.2
USB Micro-B (Sink)
USB Type-C
(Source or Sink)
IEC 62680-1-3 USB USB Type-C 5 V 1,5 A Functionally compatible
Type-C (Source or Sink) with USB BC 1.2
Current at compatible Sinks up to
1,5 A 1,5 A.
Backward compatibility
in BC 1.2 mode
supported using USB
Type-C to USB Micro-B
cables.
IEC 62680-1-3 USB USB Type-C 5 V 3 A Functionally compatible
Type-C (Source or Sink) with USB BC 1.2
Current at compatible Sinks up to
3,0 A 1,5 A
Backward compatibility
in BC 1.2 mode
supported using USB
Type-C to USB Micro-B
cables.
IEC 62680-1-2 USB USB Type-C Configurable Configurable USB4™ uses USB PD
d
Power (Source or Sink) up to 20 V as its power mode.
up to 5 A
Delivery
(USB PD)
a
These specifications do not explicitly define charging support requirements. When USB data ports also support
charging, the current capabilities of these ports are typically based on what is defined for a USB port operating
in its high power configured state, i.e. 500 mA for USB 2.0.
b
While less common, USB Standard-B and USB Mini-B are also applicable for a Sink.
c
While less common, USB Micro-AB is also applicable for a Sink.
d
Power transfer over 3 A requires use of an electronically marked 5 A cable if EPS is a detachable cable design.

Annex B provides further detail on the robustness and interoperability characteristics of USB
Type-C and USB Power Delivery solutions. ®
4.4 USB Type-C Current
The USB Type-C Current power mode is based on a regulated 5 V power source with up to 3 A
operation. This power mode uses a simple analogue method over the USB Type-C
Configuration Channel (CC) interface for a Source to advertise its available current to a Sink.
A USB Type-C Source may advertise default USB Type-C Current (500 mA or 900 mA, based
on the version of the USB port and cable), USB Type-C Current at 1,5 A or USB Type-C Current
at 3 A. An EPS shall indicate USB BC 1.2 compatibility on the port such that a device (Sink)
that doesn't recognize USB Type-C Current modes but is compatible with USB BC 1.2 can still
draw 1,5 A.
4.5 USB Power Delivery (USB PD)
Power transfer at other than 5 V or over 3 A shall comply with IEC 62680-1-2 (USB Power
Delivery). USB Power Delivery standardizes the discovery, configuration and functional
operation of more capable USB Type-C power sources and battery chargers. The USB PD
protocol, operating as a digital communication over the USB Type-C CC interface, enables a
predictable, reliable user experience based on a common set of robust mechanisms and
communication exchanges between the USB Source and the Sink. The comprehensive set of
power delivery methods supported by the USB PD protocol enables a broad range of battery
charging approaches and profiles that are specific to the design and operation of the device
being charged (the Sink) – this enables device designs to evolve and innovate while the
capabilities of a USB PD-based charger can remain a constant.
USB PD protocol is used to provide system control, error detection and handshaking. The four
required steps for enabling power delivery are:
1) Source offers its capabilities.
2) Sink requests from the offered capabilities.
3) Source accepts the request.
4) Source indicates that it is ready to provide power.
USB PD protocol can also be used for reporting the status (overcurrent protection,
overtemperature protection, overvoltage protection, etc.) of the Source.
The USB PD protocol specifies two principal modes of power transfer that can be implemented
by a USB PD Source.
– Fixed Supply operation: Provides a set of selectable fixed voltage and current combinations.
IEC 62680-1-2 defines voltages that include 5 V, 9 V, 15 V and 20 V. The Source can offer
as much as 5 A, depending on the cable current rating and selected voltage.
– Programmable Power Supply (PPS) operation: Provides granular control of voltage or a
maximum regulated source current limit. In PPS mode, the integrity of the connection is
continually monitored and absence of a handshake message between Source or Sink forces
the connection to lower safe power level. PPS places the burden of regulation in the Source
instead of in the Sink, allowing the Sink to better manage thermal rise during higher power
battery charging, which aids in lowering touch temperatures. Standard-defined voltage
ranges for PPS PDOs are nominally aligned with the defined Fixed Supply PDOs (5 V, 9 V,
15 V and 20 V) with a range minimum of 3,3 V and maximum of 5,9 V, 11 V, 16 V and 21 V,
respectively. The Source could offer as much as 5 A, depending on the cable current rating
and selected voltage.
– 14 – IEC 63002:2021 © IEC 2021
By default, all USB Type-C EPS are required to output power over a USB connector as a Fixed
Supply capable of 5 V up to 1,5 A. USB Type-C EPS chargers can also support USB PD.
USB Type-C EPSs that implement USB PD fall into one of two defined categories: a USB
charger supporting only Fixed Supply operation, or a USB charger supporting both Fixed Supply
and PPS operation. For both categories, charger products are required to indicate a user-visible
USB PD Power (PDP) rating, which dictates the minimum set of available voltage and current
ranges that a charger supports. The PDP rating, for example, which is expressed in watts
ranging from 15 W to 100 W, eases user experience by matching chargers' capabilities with
device needs and also indicates expected charging performance. For any given PDP rating, the
capabilities associated with all lower PDP ratings are required in the charger in order to assure
safe downward compatibility with lower-power devices. See Annex C for more information.
The USB Type-C and USB Power Delivery specifications will continue to evolve as data
performance and power needs increase over time, supporting new product designs and
technology innovations. While the USB PD protocol defines advertisement mechanisms to
articulate power source capabilities of up to 50 V and 10 A, the USB Type-C connector has a
practical continuous capability of 5 A.
5 External power supply (EPS) specification
5.1 General hardware specification
5.1.1 General
An EPS compliant with this document shall provide power on at least one USB Type-C
receptacle compliant with IEC 62680-1-3:2021. A power cable assembly, supplied with EPS
compliant with this document shall comply with IEC 62680-1-3:2021, Clause 3, mechanical and
electrical specifications for cable assemblies and connectors including USB Type-C standard
cable assemblies, captive cable assemblies and legacy cable assemblies.
5.1.2 AC input characteristic
The EPS AC input shall operate over the following range.
1) Voltage range: the rated input voltage range covers the range 100 V to 240 V.
2) Frequency: 50 Hz to 60 Hz.
5.1.3 Environmental specification
The EPS operational environmental range, over which the DC output characteristics shall be
maintained, shall be the following.
1) Temperature range: 0 °C to +35 °C.
2) Relative humidity: up to 90 %.
5.1.4 EPS detection
To enable a device to detect that it is connected to an EPS, the EPS shall meet the charging
port requirements for a Dedicated Charging Port as defined in IEC 62680-1-1 and
IEC 62680‑1‑3.
An EPS compliant with this document shall by default supply 5 V with a minimum current
capacity of 1,5 A.
An EPS may also provide voltages other than 5 V and currents greater than 1,5 A. These power
sources shall comply with IEC 62680-1-2 and use methods for power reporting compliant with
IEC 62680-1-3.
5.2 EPS protection
An EPS shall comply with IEC 62368-1 requirements for ES1.
EPS delivered power on V shall comply with PS2 or Clause Q.1 of IEC 62368-1:2018, where
BUS
it is unknown if the Sink is likely to comply with the requirements for PS3 operation as specified
in IEC 62368-1.
EPS maximum available output current
...