IEC 63652-1:2026

IEC 63652-1 ®
Edition 1.0 2026-02
INTERNATIONAL
STANDARD
NFC Forum Specifications -
Part 1: NFC Wireless Charging
ICS 33.160.60  ISBN 978-2-8327-0981-8

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NFC Forum Specifications -
Part 1: NFC Wireless Charging
FOREWORD
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IEC 63652-1 has been prepared by technical area 15: Wireless Power Transfer, of IEC technical
committee 100: Audio, video and multimedia systems and equipment. It is an International
Standard.
It is based on Wireless Charging Technical Specification Version 2.0 and was submitted as a Fast-
Track document.
The text of this International Standard is based on the following documents:
Draft Report on voting
100/4399/FDIS 100/4434/RVD
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Wireless Charging
Technical Specification
Version 2.0
2021-08-19
[WLC]
TM
NFC Forum
Contents
Contents
1 Introduction. 9
1.1 Objectives . 9
1.2 Applicable Documents or References . 9
1.3 Administration . 10
1.4 Trademark and Logo Usage . 10
1.5 Intellectual Property . 10
1.6 Special Word Usage . 10
1.7 Requirement Numbering . 10
1.8 Notational Conventions . 11
Notations . 11
Values of Parameters . 12
1.9 Abbreviations . 13
1.10 Glossary. 14
2 Wireless Charging User Experience . 18
2.1 User Experience Model Overview . 18
3 WLC System Overview . 19
3.1 Sequence Overview . 21
3.2 Functions Properly . 21
3.3 Wireless Charging Operating Volume . 22
3.4 Generic Wireless Charging Support Specifications . 22
4 Radio Frequency (RF) Interface . 24
4.1 Analog Interface . 24
4.2 WLC-L Specification Context . 26
4.3 WLC-P Specification Context Load Modulation Listener to Poller using class 7 WLC-
L . 26
5 Static WPT Power Definition . 28
6 Negotiated WPT Power Definition . 29
6.1 Power of a WLC-P . 29
Specification Purpose . 29
Specification Context . 29
6.2 WLC-L Sustainability . 30
Specification Purpose . 31
Specification Context . 31
7 Reference Equipment . 34
7.1 The Purpose of the NFC Forum Reference Equipment. 34
7.2 Reference Wireless Charging Poller . 35
Specification Purpose . 35
Specification Context . 35
7.3 Reference Wireless Charging Listener . 37
Specification Purpose . 37
Specification Context . 37
8 Foreign Object Detection . 39
8.1 Introduction . 39
8.2 Types of Foreign Objects . 39
8.3 Foreign Object Detection Mechanisms . 39
Wireless Charging Page
Contents
8.4 Foreign Object Detection Requirements . 40
8.5 WLC-P Impedance Change Detection . 40
Specification Purpose . 42
Specification Context . 42
Impedance Change Definition . 43
9 WLC-L WPT Stop Request and WLC-P WPT Stop Detection . 44
9.1 WPT Stop Request . 44
10 NFC Link Establishment . 47
10.1 WLC-P . 47
10.2 WLC-L . 48
11 WLC Control Protocol Messages . 49
11.1 Protocol Overview . 49
Control Protocol Messages . 49
WLC-L System Level Integration Overview . 50
Power Adjustment Generic Timing Requirements . 52
11.2 WLC Capability Message (WLC_CAP) . 54
Message Overview . 54
WLC Capability Record . 55
JiFOD Method Record . 71
11.3 WLC Poll Information (WLCP_INFO) . 74
Message Overview . 74
WLC Poll Information Record . 74
11.4 WLC Listen Control (WLCL_CTL) . 80
Message Overview . 80
WLC Listen Control Record . 81
11.5 WLC Protocol Error . 90
12 WLC Procedure Flowcharts . 91
12.1 WLC Procedure Flowchart for the WLC-P . 91
12.2 WLC Procedure Flowchart for the WLC-L . 100
A. Exhibit A . 106
B. Parameter Values . 107
B.1 WLC OV Parameters . 107
B.2 Specification Parameters . 107
B.3 Calibration Procedure for the Reference WLC-P . 110
B.4 Calibration Procedure for the Reference WLC-L . 112
B.5 Orientation and Alignment of NFC Forum Reference Equipment . 114
C. Design Information for NFC Forum Reference Equipment . 115
C.1 Reference WLC-P . 115
C.1.1 PCB Design of the Reference WLC-Ps. 115
C.1.2 Reference WLC-P - Bill Of Materials . 117
C.1.3 Mechanical Dimensions . 119
C.1.4 Reference WLC-P Printed Circuit Board (PCB) Construction . 121
C.2 Reference WLC-L . 121
C.2.1 PCB Design of the Reference WLC-L6 and Reference WLC-L7 . 121
C.2.2 Reference WLC-L - Bill Of Materials . 123
C.2.3 Mechanical Dimensions . 125
C.2.4 Reference WLC-L Printed Circuit Board (PCB) Construction . 127
Wireless Charging Page i
Contents
C.2.5 Relay Settings of the Reference WLC-Ls . 127
C.2.6 Power Class Settings of the Reference WLC-Ls . 128
D. FOD Design Guideline (Informative) . 129
D.1 FOD Scenarios . 129
D.2 JiFOD-A Implementation Guideline (Informative) . 130
D.2.1 Record definition for JiFOD-A Method . 131
D.2.2 WLC-L JiFOD-A Method Record in the WLC_CAP Message . 131
D.2.3 WLC-P JiFOD-A Method Record in the WLCP_INFO Message . 131
D.2.4 WLC-L JiFOD-A Method Record in the WLCL_CTL Message . 133
D.2.5 WLC-P Definitions . 134
D.2.6 JiFOD-A Operations . 134
E. Revision History . 138

Wireless Charging Page ii
Figures
Figures
Figure 1: NFC Wireless Charging Device User Scenario . 18
Figure 2: NFC Wireless Charging System Flowchart . 20
Figure 3: Example of WLCS Timing Diagram – Negotiated Mode . 21
Figure 4: Wireless Charging Operating Volume (WLC OV) . 22
Figure 5: Reference WLC-P6 PCB . 35
Figure 6: Reference WLC-P7 PCB . 36
Figure 7: Simplified Reference WLC-Ls Circuit . 37
Figure 8: Reference WLC-L6 PCB . 38
Figure 9: Reference WLC-L7 PCB . 38
Figure 10: Impedance Change Example with Increased Impedance . 41
Figure 11: Impedance Change Example with Decreased Impedance . 41
Figure 12: Example of a Short Time Impedance Change with a Duration of t . 42
S,PULSE
Figure 13: Positive and Negative Impedance Change Cases of the WPT Stop Request . 45
Figure 14: WPT Stop Request Section with Detailed Timing Definitions . 46
Figure 15: Protocol Architecture. 49
Figure 16: Message Exchanges for Different WLC-L Implementation Options . 52
Figure 17: Operation Field Adjustment Timing Definition . 53
Figure 18: WLC_CAP Format . 54
Figure 19: WLCP_INFO Format . 74
Figure 20: WLCL_CTL Format . 80
Figure 21: WLC Procedure – WLC-P Flowchart . 92
Figure 22: WLC Procedure – WLC-L Flowchart . 100
Figure 23: Calibration Plane of SMA Plug and Socket . 110
Figure 24: Example of VNA Display while Tuning a Reference WLC-P6. 111
Figure 25: Example of VNA Display while Tuning a Reference WLC-P7. 112
Figure 26: Example of VNA Display while Tuning a Reference WLC-L6 . 113
Figure 27: Example of VNA Display while Tuning a Reference WLC-L7 . 114
Figure 28: Circuit for the Reference WLC-P6 and Reference WLC-P7 . 115
Figure 29: PCB Layout for the Reference WLC-P6 . 115
Figure 30: PCB Layout for the Reference WLC-P7 . 116
Figure 31: Reference WLC-P6 Top Layer . 119
Figure 32: Reference WLC-P6 Bottom Layer . 119
Figure 33: Reference WLC-P7 Top Layer . 120
Wireless Charging Page iii
Figures
Figure 34: Reference WLC-P7 Bottom Layer . 120
Figure 35: Circuit for the Reference WLC-L6 and Reference WLC-L7 . 121
Figure 36: PCB Layout for the Reference WLC-L6 . 122
Figure 37: PCB Layout for the Reference WLC-L7 . 122
Figure 38: Reference WLC-L6 Top Layer . 125
Figure 39: Reference WLC-L6 Bottom Layer . 125
Figure 40: Reference WLC-L7 Top Layer . 126
Figure 41: Reference WLC-L7 Bottom Layer . 126
Figure 42: FOD Scenarios . 129
Figure 43: Initial FOD Timing Diagram . 131
Figure 44: JiFOD Timing Definition . 134
Figure 45: FOD Method using Impedance Change Monitoring . 135
Figure 46: FOD Interval Scheme . 135
Figure 47: Initial FOD Sequence – No FO Detection . 136
Figure 48: Initial FOD Sequence – FO Detection . 137

Wireless Charging Page iv
Tables
Tables
Table 1: Sample Requirement . 10
Table 2: Notational Conventions . 11
Table 3: Abbreviations . 13
Table 4: Wireless Charging Control Messages . 49
Table 5: WLC Capability Record Payload . 55
Table 6: WLC_PROTOCOL_VER Format . 55
Table 7: WLC_CONFIG Format . 57
Table 8: CAP_WT_INT Format . 58
Table 9: NDEF_RD_WT Values . 60
Table 10: NDEF_WR_TO_INT Values . 62
Table 11: NDEF_WR_WT_INT Values . 63
Table 12 WLC Status and Info Record Payload . 65
Table 13: CONTROL_BYTE_1 Format . 66
Table 14: RECEIVE_POWER Field Values . 67
Table 15: RECEIVE_VOLTAGE Field Values . 68
Table 16: RECEIVE_CURRENT Field Values . 68
Table 17: TEMPERATURE_BATTERY Field Values . 69
Table 18: CONTROL_BYTE_2 Format . 70
Table 19: BATTERY_VOLTAGE Field Values . 70
Table 20: BATTERY_CURRENT Field Values . 71
Table 21: JiFOD Method Record Payload. 72
Table 22: WLC Poll Information Record Payload . 75
Table 23: P_TX Values . 75
Table 24: WLC_P Capability Definition . 76
Table 25: WLC-P_POWER_CLASS Definition . 77
Table 26: TOT_POWER_STEPS . 77
Table 27: CUR_POWER_STEP . 78
Table 28: Minimum Step for Power Increase - NEXT_MIN_STEP_INC . 78
Table 29: Minimum Step for Power Decrease - NEXT_MIN_STEP_DEC . 79
Table 30: WLC Listen Control Record Payload . 81
Table 31: STATUS_INFO. 82
Table 32: WPT_CONFIG . 83
Table 33: POWER_ADJ_REQ Values . 85
Wireless Charging Page v
Tables
Table 34: BATTERY_LEVEL Values . 86
Table 35: DVR_INFO . 87
Table 36: HOLD_OFF_WT_INT Values . 88
Table 37: ERROR_INFO . 89
Table 38: Parameters for WLC OV. 107
Table 39: Parameters for WLC . 107
Table 40: Parameters for Reference Equipment Set Up . 109
Table 41: Calibration values for Reference WLC-P6 and Reference WLC-P7 . 110
Table 42: Calibration Values for Reference WLC-L6 and Reference WLC-L7 . 113
Table 43: Reference WLC-P6 - Bill Of Materials . 117
Table 44: Reference WLC-P7 - Bill Of Materials . 118
Table 45: Antenna Relay Settings of the Reference WLC-L. 127
Table 46: Short Plug Settings of the Reference WLC-L6 and Reference WLC-L7 . 128
Table 47: FOD Scenarios . 129
Table 48: Format of the JiFOD Method Record . 132
Table 49: JiFOD_REQ Format . 132
Table 50: JiFOD_DURATION_P Values . 132
Table 51: Format of the JiFOD Method Record . 133
Table 52: JiFOD_DURATION Values . 133
Table 53: Revision History . 138

Wireless Charging Page vi
Requirements
Requirements
Requirements 1: Reference Equipment Support . 23
Requirements 2: Analog Interface . 24
Requirements 3: Power level of Static Wireless Power Transfer . 28
Requirements 4: WLC-P Power of Negotiated WPT . 30
Requirements 5: WLC-L Sustainability . 32
Requirements 6: Reference WLC-P . 36
Requirements 7: Reference WLC-L . 38
Requirements 8: Generic FOD. 39
Requirements 9: Generic Background FOD . 40
Requirements 10: NFC Polling FOD . 40
Requirements 11: WLC-P Impedance Change Detection . 43
Requirements 12: WPT Stop . 44
Requirements 13: NFC LE – WLC-P. 47
Requirements 14: NFC LE – WLC-L . 48
Requirements 15: WLC Control Protocol – Generic messages . 50
Requirements 16: Power Adjustment – Generic timing . 53
Requirements 17: WLC_CAP . 54
Requirements 18: WLC Capability Record . 55
Requirements 19: WLC_PROTOCOL_VER . 56
Requirements 20: WLC_CONFIG . 57
Requirements 21: CAP_WT_INT . 59
Requirements 22: NDEF_RD_WT . 60
Requirements 23: NDEF_WR_TO_INT . 62
Requirements 24: NDEF_WR_WT_INT . 63
Requirements 25: WLC Status and Info Record . 65
Requirements 26: Control Byte 1 . 66
Requirements 27: RECEIVE_POWER . 67
Requirements 28: RECEIVE_VOLTAGE . 68
Requirements 29: RECEIVE_CURRENT . 68
Requirements 30: TEMPERATURE_BATTERY . 69
Requirements 31: TEMPERATURE_WLCL . 69
Requirements 32: Control Byte 2 . 70
Requirements 33: BATTERY_VOLTAGE . 70
Wireless Charging Page vii
Requirements
Requirements 34: BATTERY_CURRENT . 71
Requirements 35: JiFOD Method Record . 72
Requirements 36: COMPANY_ID . 72
Requirements 37: METHOD_ID . 73
Requirements 38: WLCP_INFO . 74
Requirements 39: WLC Poll Information Record. 75
Requirements 40: P_TX . 76
Requirements 41: WLC_P_CAP . 76
Requirements 42: WLC-P_POWER_CLASS . 77
Requirements 43: TOT_POWER_STEPS . 77
Requirements 44: CUR_POWER_STEP . 78
Requirements 45: Minimum Step for Power Increase - NEXT_MIN_STEP_INC . 79
Requirements 46: Minimum Step for Power Decrease - NEXT_MIN_STEP_DEC . 79
Requirements 47: WLCL_CTL . 80
Requirements 48: WLC Listen Control Record . 81
Requirements 49: STATUS_INFO . 82
Requirements 50: WPT_CONFIG . 84
Requirements 51: POWER_ADJ_REQ . 85
Requirements 52: BATTERY_LEVEL . 86
Requirements 53: DVR_INFO . 87
Requirements 54: HOLD_OFF_WT_INT . 88
Requirements 55: ERROR_INFO . 89
Requirements 56: BATTERY_LEVEL field handling . 89
Requirements 57: WLC Protocol Error . 90
Requirements 58: WLC Procedure – WLC-P . 93
Requirements 59: WLC Procedure – WLC-L . 101
Wireless Charging Page viii
Introduction
1 Introduction
NFC technology allows power to be transferred to a Tag in order to enable communication. This
is achieved by providing a constant carrier signal.
This specification expands this scope by using the NFC communication link to control the power
transferred. Thus the pure communication purpose of NFC is extended to wireless charging.
The transferred power can charge small NFC enabled devices such as smartwatches, activity
trackers, headsets and many other consumer electronics products.
The benefits of NFC technology for wireless charging include:
• Use of the existing NFC specification for controlling the received power to provide
charging
• Sharing the same antenna for both communication and power transfer.
1.1 Objectives
This document specifies a method and procedures for Wireless Power Transfer between two NFC
wireless devices. The provided technical foundations use NFC technology for the initiation,
control and execution of 13.56 MHz power transfer.
1.2 Applicable Documents or References
The following documents contain provisions that are referenced in this specification. The latest
version (including all published amendments) applies unless a publication date is explicitly
stated.
[ACTIVITY] Activity Technical Specification,
NFC Forum
[ANALOG] Analog Technical Specification,
NFC Forum
[DIGITAL] Digital Protocol Technical Specification
NFC Forum
[MANU] Register of IC manufacturers, ISO/IEC JTC1/SC17,
Standing Document 5
[NDEF] NFC Data Exchange Format (NDEF) Technical Specification,
NFC Forum
[RFC2119] Key words for use in RFCs to Indicate Requirement Levels, RFC 2119,
S. Bradner,
March 1997,
Internet Engineering Task Force
[RTD] NFC Record Type Definition Specification
NFC Forum
[RTD-DI] Device Information RTD Technical Specification,
NFC Forum
[T2T] Type 2 Tag Technical Specification,
NFC Forum
Wireless Charging Page 9
Introduction
[T3T] Type 3 Tag Technical Specification,
NFC Forum
[T4T] Type 4 Tag Technical Specification,
NFC Forum
[T5T] Type 5 Tag Technical Specification,
NFC Forum
[WLC_TC] Test Specification/Cases for Wireless Charging Technical Specification,
NFC Forum
1.3 Administration
The NFC Forum Wireless Charging Specification is an open specification supported by the Near
Field Communication Forum, Inc., located at:
401 Edgewater Place, Suite 600
Wakefield, MA, 01880
Tel.: +1 781-876-8955
Fax: +1 781-610-9864
http://www.nfc-forum.org/
The NFC Forum, Inc. maintains this specification.
1.4 Trademark and Logo Usage
The Near Field Communication Forum’s policy regarding the use of trademarks and logos is
described in the NFC Forum Brand Identity Guidelines and N-Mark Usage Guidelines, which can
be found on the NFC Forum website.
1.5 Intellectual Property
The Wireless Charging Specification conforms to the Intellectual Property guidelines specified in
the NFC Forum's Intellectual Property Rights Policy, as outlined in the NFC Forum Rules of
Procedure. These documents are available on the NFC Forum website.
1.6 Special Word Usage
The key words “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT” and “MAY” in this
document are to be interpreted as described in [RFC2119].
1.7 Requirement Numbering
Requirements in this document are uniquely numbered with the number appearing next to each
requirement. For example:
Table 1: Sample Requirement
A car SHALL have four wheels.
A requirement can have different numbers in different versions of the specifications. Hence, all
references to a requirement need to include the version of the document as well as the
requirement’s number.
Wireless Charging Page 10
Introduction
1.8 Notational Conventions
Notations
The notations shown in Table 2 apply in this document.
Table 2: Notational Conventions
Notation Description
0xXY Hexadecimal notation.
Hexadecimal numbers are represented using the numbers 0 - 9 and
the characters A – F. An “0x” is added as prefix. The most
significant byte (MSB) is shown on the left; the least significant
byte (LSB) on the right.
Example: 0xF5
xyb Binary notation.
Binary numbers are represented by strings of the digits 0 and 1,
shown with the most significant bit (msb) on the left and the least
significant bit (lsb) on the right. A “b” is added at the end.
Example: 11110101b
xy Decimal notation
Decimal numbers are represented without any tailing character.
Examp
...