oSIST prEN IEC 63758-5-6:2026

• Status: Not Published
• Public Enquiry End Date: 29-Nov-2026
• ICS: 29.240.99 - Other equipment related to power transmission and distribution networks
• ICS: 33.160.99 - Other audio, video and audiovisual equipment
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: AVM - Audio, video and multimedia systems and equipment
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 28-Sep-2026
• Due Date: 15-Feb-2027
• Directive: 2014/53/EU - Directive 2014/53/EU of The European Parliament and of the Council of 16 April 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of radio equipment and repealing Directive 1999/5/EC
• Mandate: M/607 - COMMISSION IMPLEMENTING DECISION of C(2025)1207 on a Standardisation Request M/607 as regards charging interface and charging communication protocol for radio equipment capable of being recharged by means of wireless charging in relation with Article 3(4), sixth subparagraph, of Directive 2014/53/EU of the European Parliament and of the Council.
• Ref Project: prEN IEC 63758-5-6:2026 - Qi specification - Version 2.3 - Part 5-6: Mpp - Communications physical layer (Informative) (Fast Track)

oSIST prEN IEC 63758-5-6:2026 is the Slovenian standard for Qi Specification - Version 2.3 - Part 5-6: MPP - Communications physical layer, published by SIST. It defines the low-level physical layer and data link layer used by MPP Power Transmitter (PTx) and Power Receiver (PRx) to exchange data with Frequency Shift Keying (FSK) from PTx to PRx and Amplitude Shift Keying (ASK) from PRx to PTx. The document is aimed at engineers, test teams, and integrators working on MPP wireless charging links and packet handling.

What does oSIST prEN IEC 63758-5-6:2026 specify?

oSIST prEN IEC 63758-5-6:2026 specifies the formats of data bits, data bytes, and data packets for the MPP communications physical layer. It also gives requirements and guidance for load modulation and FSK used in MPP communication.

The document is organized into four main clauses:

• Clause 1 gives general rules, compliance wording, references, and notation.
• Clause 2 introduces the communications physical layer and the MPP communication model.
• Clause 3 covers Frequency Shift Keying (FSK) from PTx to PRx.
• Clause 4 covers Amplitude Shift Keying (ASK) from PRx to PTx, including modulation, receiver behavior, recommendations, and test conditions.

What are the key requirements of oSIST prEN IEC 63758-5-6:2026?

General rules and notation

Clause 1.3 states that the provisions in the Qi Specification are mandatory unless they are explicitly marked as recommended, optional, a note, an example, or informative. In practice, that means implementers need to treat every “shall” statement as a conformance point.

Clauses 1.5.1 to 1.5.5 set out the notation for numbers, tolerances, packet fields, text strings, and shorthand packet names. These rules matter because transmitter and receiver implementations must encode and decode packet content in the same way, including big-endian numeric fields and ASCII text strings padded with NUL characters where needed.

PTx to PRx communication by FSK

Clause 2.1 says that in MPP mode the PTx communicates to the PRx by modulating inverter frequency, and the PRx can demodulate that information as part of synchronous rectification. In practical terms, the power stage is also the data link, so the design has to support both energy transfer and symbol detection at the same time.

Clause 3 defines the FSK operating model and its timing. The PTx uses the shared bit encoding scheme, transmits with a 128-cycle bit period except when answering a CFG packet, and uses a 512-cycle bit period for CFG responses. It also transmits response patterns, including the MPPACK Pattern, and sends a preamble of 4 ONE bits before every FSK data packet. For implementers, this means packet timing and preamble handling are fixed parts of interoperability.

Clause 3 also specifies receiver behavior for noisy conditions. The PRx FSK receiver is described with filtering, detector, timing control, and packet decoding steps, and the text notes that light-load inverter harmonics can create extra comparator crossings. In practice, FSK receivers need countermeasures such as comparator hysteresis, adaptive reference selection, or blanking times so they can still decode reliably.

PRx to PTx communication by ASK

Clause 4 defines ASK as the PRx changing the power it draws so the PTx sees either magnitude or phase states. The document states that a state must remain constant within a ripple band for at least 100 μs, so implementers need stable modulation behavior rather than brief switching spikes.

Clause 4.2 describes the ASK modulator and receiver models. At 128 kHz, the PRx uses communications capacitors to ground and the switches must turn on with zero-voltage switching and turn off immediately. At 360 kHz, the PRx modulates electronic load current, and the modulation strength can be adjusted by changing MOD_DEPTH and MOD_BASE. That matters because ASK performance depends on load, operating mode, and the ability to tune signal strength during operation.

Clause 4.2.2 describes the PTx ASK receiver chain. The PTx measures the transmitter series capacitor voltage with a differential amplifier, anti-alias filter, and fast ADC, then uses quadrature demodulation, low-pass filtering, decimation, and Magnitude/Phase detector units. The practical point is that the transmitter side also needs a dedicated receive path if it is to decode reverse communication correctly.

Packet integrity, interoperability, and test points

Clause 4.3 requires the same bit and byte encoding schemes, the same header, message, and checksum fields, and adjacent bytes to be transmitted without gaps. The document also marks PRxASKSpec8 as deprecated. For product teams, that means packet structure has to match the wider Qi communication model, not just the local modulation method.

Clauses 4.3.9 and 4.3.10 define ASK performance checks on the Test Power Transmitter (TPT) reference setup. At 128 kHz and 360 kHz, the PRx must meet either an amplitude-based or a phase-based condition together with the specified signal quality condition when placed in the 2x2 mm MPP cylinder on TPT#MPP1. In practice, this is the interoperability gate: the signal must be strong enough and clean enough at a defined test position.

Clause 4.3.11 requires the PTx to receive and decode ASK transmissions from the PRx without causing a disconnect when mated with a TPR. Clause 4.4 then gives recommendations for modulation strength, use of real-power load variation, inverter-rail noise, and the instantaneous DC input power rise during ASK. These points help designers tune robustness and efficiency beyond the minimum conformance behavior.

What terms does oSIST prEN IEC 63758-5-6:2026 define?

• Power Transmitter (PTx) - the Qi device that sends power and carries FSK and ASK communication functions.
• Power Receiver (PRx) - the Qi device that receives power and sends information back to the PTx by ASK.
• Frequency Shift Keying (FSK) - the PTx-to-PRx coding method that uses different power-switching frequencies to represent data.
• Amplitude Shift Keying (ASK) - the PRx-to-PTx coding method that changes the load so the transmitter sees magnitude or phase changes.
• Signal to Noise Ratio (SNR) - the measure used in the ASK test conditions to judge whether the signal is readable enough.
• Test Power Transmitter (TPT) - the reference transmitter used for the ASK placement and performance checks.
• CFG packet - the packet type that triggers the longer FSK bit period used for a specific response case.

Who uses oSIST prEN IEC 63758-5-6:2026?

This standard is used by engineers designing MPP wireless charging transmitters and receivers, especially where communication shares the same power path as energy transfer. Firmware teams use it to implement packet encoding, timing, and decode logic.

It is also used by test and validation teams that measure FSK and ASK performance, check modulation strength, and verify interoperability against the TPT setup. Quality managers and buyers use it to compare transmitter and receiver designs, modules, and chipset behavior against a shared communications method.

Which standards are used with oSIST prEN IEC 63758-5-6:2026?

Companion part	What it contributes
Communications Physical Layer book	Shared bit and byte encoding rules, packet field structure, response patterns, and the general communications model used by this part.
MPP Communications Protocol book	Packet and response context for MPP operation, including the CFG-related behavior referenced by the FSK rules.
MPP Power Delivery book	Power-transfer behavior that affects communication design, including dithering and related MPP power-stage context.

For undated references, the most recent WPC publication applies.

What does the oSIST prEN IEC 63758-5-6:2026 document contain?

The document includes a general section on compliance and notation, then a communications physical layer introduction, followed by separate FSK and ASK sections. It contains system model descriptions for the PTx and PRx sides, including receiver and modulator architectures.

It also includes tables and figures that support implementation and testing:

• Table 1 explains verbal forms such as “shall” and “should”.
• Table 2 shows how packet fields are interpreted.
• Table 3 gives MOD_BASE selection guidance.
• Figures 1 to 11 illustrate packet layout, system models, modulation trends, and sample waveforms.

These contents are used for design, coding, test planning, and interoperability checks for MPP wireless power communication.

SLOVENSKI STANDARD
01-november-2026
Specifikacija Qi - Različica 2.3 - 5-6. del: Mpp - Fizična raven komunikacije
(informativno) (hitri postopek)
Qi specification - Version 2.3 - Part 5-6: Mpp - Communications physical layer
(Informative) (Fast Track)
Ta slovenski standard je istoveten z: prEN IEC 63758-5-6:2026
ICS:
29.240.99 Druga oprema v zvezi z Other equipment related to
omrežji za prenos in power transmission and
distribucijo električne energije distribution networks
33.160.99 Druga avdio, video in Other audio, video and
avdiovizuelna oprema audiovisual equipment
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

100/4548/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63758-5-6 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-09-18 2026-12-11
SUPERSEDES DOCUMENTS:
IEC TC 100 : AUDIO, VIDEO AND MULTIMEDIA SYSTEMS AND EQUIPMENT
SECRETARIAT: SECRETARY:
Japan Ms Mahiru Uehara
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 106,TC 108
ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they
are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries”
clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Qi Specification - Version 2.3 - Part 5-6: MPP - Communications physical layer (Informative) (Fast
Track)
PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
As this is a fast-track process offered by WPC, the Word file is not provided.

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

QiSpecification
MPP–CommunicationsPhysical
Layer
Version2.3
PublishDate:08December2025
DISCLAIMER
Theinformationcontainedhereinisbelievedtobeaccurateasofthedateofpublication,butisprovided“asis”andmay
containerrors.TheWirelessPowerConsortiummakesnowarranty,expressorimplied,withrespecttothisdocument
anditscontents,includinganywarrantyoftitle,ownership,merchantability,orfitnessforaparticularuseorpurpose.
NeithertheWirelessPowerConsortium,noranymemberoftheWirelessPowerConsortiumwillbeliableforerrorsin
thisdocumentorforanydamages,includingindirectorconsequential,fromuseoforrelianceontheaccuracyofthis
document.Foranyfurtherexplanationofthecontentsofthisdocument,orincaseofanyperceivedinconsistencyor
ambiguityofinterpretation,contact:[e-mail].

Contents
1. General 5
1.1 StructureoftheQi Specification 5
1.2 Scope 6
1.3 Compliance 6
1.4 References 6
1.5 Conventions 7
1.5.1 Notationofnumbers 7
1.5.2 Tolerances 7
1.5.3 Fieldsinadatapacket 7
1.5.4 Notationoftextstrings 8
1.5.5 Short-handnotationfordatapackets 8
2. CommunicationsPhysicalLayer 9
2.1 Introduction 9
3. FrequencyShiftKeying(PTxtoPRx) 10
3.1 SystemModel 10
3.1.1 FSKModulator(PTx) 10
3.1.2 FSKReceiver(PRx) 11
3.2 FrequencyShiftKeyingSpecifications 13
3.2.1 PTxFSKSpec1 13
3.2.2 PTxFSKSpec2 13
3.2.3 PTxFSKSpec3 13
3.2.4 PTxFSKSpec4 13
3.2.5 PTxFSKSpec5 13
3.2.6 PTxFSKSpec6 13
3.2.7 PTxFSKSpec7 13
3.2.8 PTxFSKSpec8 13
3.2.9 PTxFSKSpec9 13
3.2.10 PTxFSKSpec10 14
3.2.11 PTxFSKSpec11 14
3.2.12 PTxFSKSpec12 14
3.2.13 PTxFSKSpec13 14
3.2.14 PTxFSKSpec14 14
3.2.15 PRxFSKSpec1 14
4. AmplitudeShiftKeying(PRxtoPTx) 15
4.1 ModulationScheme 15
4.2 SystemModel 16
4.2.1 ASKModulator(PRx) 16
4.2.2 ASKReceiver(PTx) 19
4.2.3 ASKModulationTrends 20
4.3 ASKSpecifications 22
4.3.1 PRxASKSpec1 22
4.3.2 PRxASKSpec2 22
4.3.3 PRxASKSpec3 22
4.3.4 PRxASKSpec4 22
4.3.5 PRxASKSpec5 22
4.3.6 PRxASKSpec6 22
4.3.7 PRxASKSpec7 22
4.3.8 PRxASKSpec8 22
4.3.9 PRxASKSpec9 22
4.3.10 PRxASKSpec10 23
4.3.11 PTxASKSpec1 23
4.4 Recommendations 24
4.4.1 PRxASKRecommendation1 24
4.4.2 PRxASKRecommendation2 24
4.4.3 PRxASKRecommendation3 24
4.4.4 PRxASK Recommendation4 24

1. General
TheWirelessPowerConsortium(WPC)isaworldwideorganizationthataimstodevelopandpromoteglobalstandards
forwirelesspowertransferinvariousapplicationareas.Animportantapplicationareacomprisesflat-surfacedevices
suchasmobilephonesandchargersoperatingatpowerlevelsupto25W.
1.1 StructureoftheQi Specification
Generaldocuments
l
Introduction
l
Glossary,Acronyms,andSymbols
l
TechnicalSystemOverview
l
PowerProfiles
Systemdescriptiondocuments
l
Mechanical,Thermal,andUserInterface
l
PowerDelivery
l
CommunicationsPhysicalLayer
l
CommunicationsProtocol
l
ForeignObjectDetection
l
NFCTagProtection
l
AuthenticationProtocol
l
MPPCommunicationsProtocol
l
MPPMagneticsDesign
l
MPP PowerDelivery
l
MPP CommunicationsPhysicalLayer
l
MPP ForeignObjectDetection
l
MPP DesignGuidelines(Informative)
l
MagneticCovers
l
ActiveAlignmentSystem
l
ThermalManagementProtocol
1.2 Scope
TheQiSpecification,MPPCommunicationsPhysicalLayer(thisdocument)definesthelow-level(physicallayerandthe
datalinklayer)formatsofdatabits,databytes,anddatapackets.Inaddition,itprovidesrequirementsandguidelines
forloadmodulationandfrequency-shiftkeying.
1.3 Compliance
AllprovisionsintheQiSpecificationaremandatory,unlessspecificallyindicatedasrecommended,optional,note,
example,orinformative.VerbalexpressionofprovisionsinthisSpecificationfollowtherulesprovidedinISO/IEC
Directives,Part2.
Table1-Verbalformsforexpressionsofprovisions
Provision Verbalform
requirement “shall”or“shallnot”
recommendation “should”or“shouldnot”
permission “may”or“maynot”
capability “can”or“cannot”
1.4 References
Forundatedreferences,themostrecentlypublisheddocumentapplies.ThemostrecentWPCpublicationscanbe
downloadedfromhttp://www.wirelesspowerconsortium.com.

1.5 Conventions
1.5.1 Notationofnumbers
l
Realnumbersusethedigits0to9,adecimalpoint,andoptionallyanexponentialpart.
l
Integernumbersindecimalnotationusethedigits0to9.
l
Integernumbersinhexadecimalnotationusethehexadecimaldigits0to9andAtoF,andareprefixedby"0x"
unlessexplicitlyindicatedotherwise.
l
SinglebitvaluesusethewordsZEROandONE.
1.5.2 Tolerances
Unlessindicatedotherwise,allnumericvaluesintheQiSpecificationareexactlyasspecifiedanddonothaveany
impliedtolerance.
1.5.3 Fieldsinadatapacket
Anumericvaluestoredinafieldofadatapacketusesabig-endianformat.Bitsthataremoresignificantarestoredata
lowerbyteoffsetthanbitsthatarelesssignificant.Table2andFigure1provideexamplesoftheinterpretationofsuch
fields.
Table2-Exampleoffieldsinadatapacket(table)
b b b b b b b b
7 6 5 4 3 2 1 0
B (msb)
B 16-bitNumericDataField (lsb)
B OtherField
(msb)
B 16-bitNumericDataField (lsb)
Field
Figure1-Examplesoffieldsinadatapacket

1.5.4 Notationoftextstrings
TextstringsconsistofasequenceofprintableASCIIcharacters(i.e.intherangeof0x20to0x7E)enclosedindouble
quotes(").Textstringsarestoredinfieldsofdatastructureswiththefirstcharacterofthestringatthelowestbyte
offset,andarepaddedwithASCIINUL(0x00)characterstotheendofthefieldwherenecessary.
EXAMPLE: Thetextstring“WPC”isstoredinasix-bytefieldsasthesequenceofcharacters'W','P','C',NUL,NUL,and
NUL.Thetextstring“M:4D3A”isstoredinasix-bytefieldasthesequence'M',':','4','D','3',and'A'.
1.5.5 Short-handnotationfordatapackets
Inmanyinstances,theQiSpecificationreferstoadatapacketusingthefollowingshorthandnotation:
/
Inthisnotation,referstothedatapacket'smnemonicdefinedintheQiSpecification,Communications
Protocol,andreferstoaparticularvalueinafieldofthedatapacket.Thedefinitionsofthedatapacketsin
theQiSpecification,CommunicationsProtocol,listthemeaningsofthemodifiers.
Forexample,EPT/ccreferstoanEndPowerTransferdatapackethavingitsEndPowerTransfercodefieldsetto0x01.

2. CommunicationsPhysicalLayer
2.1 Introduction
ThisbookdescribesthephysicalcommunicationslayerthatisimplementedinMPPandthecorrespondingspecifications
foranMPPPTxandPRx.
InMPPmode,thePTxcommunicatestothePRxbymodulatingtheinverterfrequencyandthereforethepowersignal
frequency.ThiscanbedemodulatedonthePRxaspartofthesynchronousrectificationprocess.ThePRxuses
backscattermodulationtocommunicatebacktothePTx.Forthispurpose,thePRxmodulatestheamplitudeofthe
powersignalbychangingitsload.ThePTxcandemodulatethissignalbymeasuringthevoltageacrosstheresonant
capacitor( ).AfigureofthesystemmodelisshowninFigure2.
Figure2-MPPCommsPhysicalSystemModel.

3. FrequencyShiftKeying(PTxtoPRx)
TheMPPsystemmodelusestheFSKmodulationbitencodingschemeasdefinedintheCommunicationsPhysicalLayer
book andusesthefollowingmodulationparameters:
Value
Parameter
MPP
MPP
(360kHzrampuppingand
(128kHzdigitalping)
powertransfer)
PowerFrequency( ) 127.772kHz 360kHz
ModulationFrequency( ) 125.435kHz 366.412kHz
NumberofSwitchingCyclesPerBit 512
(FollowingCFGpacketonly)
NumberofSwitchingCyclesPerBit 128
(followinganyASKpacketotherthanCFG)
3.1 SystemModel
3.1.1 FSKModulator(PTx)
ThesystemmodelFSKtransmitterispresentedinFigure3.Ingeneral,PowerTransmittervariesitsoperatingfrequency
totransmitdatatothePowerReceiver.
Whenoperatingat128kHz,thePTxperformsFSKmodulationbyswitchingbetweenthenominaloperatingfrequency,
,of127.772kHzandthemodulatedfrequency, ,of125.435kHz.
Whenoperatingat360kHz:
l thePTxperformsFSKmodulationbyswitchingbetweenthenominaloperatingfrequency, ,of360kHzand
themodulatedfrequency, ,of366.412kHz
l
frequencyditheringisused,witharepetitionlengthof16powerfrequencycyclesandadeviationof-7kHzto+7
kHz
l
thefrequencyditheringdeviationislargerthantheFSKmodulationdepth
l and valuesaretheaveragesmeasuredoveraperiodof16cycles

Figure3- SystemModelforFSKTransmitter.
3.1.2 FSKReceiver(PRx)
ThesystemmodelofaPRxFSKreceiverispresentedinFigure4.
Ingeneral,thePRxmeasuresthefrequencyofthereceivedACpowerbymeasuringthecycle-on-cycletimeofthepower
switchingfrequency.
Themeasuredcycletimesarethenprocessedinthedigitaldomain.Thesignalchainconsistsof:
l
amovingaveragefilterisusedtofilteroutnoise.Thelengthofthefilteris64cycles,whichisanexactmultipleof
themaximumditherperiod-16cycles.Thismeansthemovingaveragefilterwillbothattenuaterandomnoise
andremoveditheringsignals
l
thefilteredsignalisthenpassedtoadetector/receiverunit
l
finally,thereceivertakeswhicheverisavailable-andcorrect-firstfromtheMagnitudeandPhasedetector/
receiverunits.
Thedetector/receiverunit:
l
maybeimplementedinhardware,software,oramixtureofthetwo
l
removesDCcontentfromtheinputsignal
l
appliessymboldetectionfilters;thesedetectthespecificshapeofFSKsignalwaveformsandremoveasmuch
noiseaspossible
l
appliessomeformofsampletimingcontrolsuchastimecountingandpeakdetection
l
samplestheincomingdatastreamtoproduceastreamofindividualencodedbits
l
removesthedifferentialbi-phaseencoding
l
performspacketdecoding.
Figure4-SystemModelforFSKReceiver.
Inprinciple,theFSKdetectorelectronicscouldbeassimpleasacomparatorwhichcomparestheAC1orAC2signalto
somereference.
However,atlightload,thecoilcurrentwaveformsbecomedistortedbythepresenceofharmoniccontentdevelopedby
theinverter.Inparticular,the3rdharmonicofa360kHzpowerfrequency(1.08MHz)mayexcitearesonancewiththe
parallelcapacitorC requiredtoestablisha1MHzresonanceforBPPAnaloguePing(referto theMPPPowerDelivery
d
bookforfurtherinformation).ThiscancauseoscillationsofAC1andAC2nodevoltages,andgenerateextracrossing
eventsonthecomparatoroutputasshowninFigure5.
TheFSKreceivermustincludeappropriatecountermeasurestoaddressthissituation,whichcouldincludetheuseof
comparatorhysteresis,adaptivereference
...