Information technology — Telecommunications and information exchange between systems — Near Field Communication Wired Interface (NFC-WI)

ISO/IEC 28361:2007 specifies the digital wire interface between a Transceiver and a Front-end. The specification includes the signal wires, binary signals, the state diagrams and the bit encodings for three data rates.

Technologies de l'information — Téléinformatique — Interface câblée de communication de champs proche (NFC-WI)

General Information

Status
Published
Publication Date
18-Sep-2007
Current Stage
9060 - Close of review
Start Date
19-Dec-2012
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ISO/IEC 28361:2007 - Information technology -- Telecommunications and information exchange between systems -- Near Field Communication Wired Interface (NFC-WI)
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INTERNATIONAL ISO/IEC
STANDARD 28361
First edition
2007-10-01
Information technology —
Telecommunications and information
exchange between systems — Near Field
Communication Wired Interface (NFC-WI)
Technologies de l'information — Téléinformatique — Interface câblée
de communication de champs proche (NFC-WI)
Reference number
ISO/IEC 28361:2007(E)
ISO/IEC 2007
---------------------- Page: 1 ----------------------
ISO/IEC 28361:2007(E)
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© ISO/IEC 2007

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

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Published in Switzerland
ii © ISO/IEC 2007 – All rights reserved
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ISO/IEC 28361:2007(E)
Contents Page

Foreword............................................................................................................................................................ iv

Introduction ........................................................................................................................................................ v

1 Scope ..................................................................................................................................................... 1

2 Terms and definitions........................................................................................................................... 1

3 Conventions and notations ................................................................................................................. 1

3.1 Representation of bit values................................................................................................................ 1

3.2 Representation of logical states of LOW and HIGH .......................................................................... 1

3.3 Capitalisation of names........................................................................................................................ 2

3.4 State notation ........................................................................................................................................ 2

4 Symbols and abbreviated terms ......................................................................................................... 2

5 General................................................................................................................................................... 2

6 Signals ................................................................................................................................................... 3

6.1 Signal wires ........................................................................................................................................... 3

6.2 Electrical characteristics ..................................................................................................................... 3

6.3 Clock frequency (f )........................................................................................................................ 4

CLK

7 NFC-WI states........................................................................................................................................ 4

7.1 Off state ................................................................................................................................................. 5

7.2 Activating state ..................................................................................................................................... 5

7.3 On state.................................................................................................................................................. 7

7.4 De-Activating state ............................................................................................................................... 8

7.5 Command state ..................................................................................................................................... 9

8 Information-transfer............................................................................................................................ 10

8.1 Manchester bit coding........................................................................................................................ 10

8.2 Modified Miller bit coding .................................................................................................................. 10

8.3 Bit coding for f /128 (~106 kb/s) .................................................................................................. 11

CLK

8.4 Bit coding for f /64 (~212 kb/s) .................................................................................................... 11

CLK

8.5 Bit coding for f /32 (~424 kb/s) .................................................................................................... 12

CLK

Annex A (informative) Application of NFC-WI with NFCIP-1........................................................................ 13

Annex B (informative) Command state configuration.................................................................................. 17

© ISO/IEC 2007 – All rights reserved iii
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ISO/IEC 28361:2007(E)
Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical

Commission) form the specialized system for worldwide standardization. National bodies that are members of

ISO or IEC participate in the development of International Standards through technical committees

established by the respective organization to deal with particular fields of technical activity. ISO and IEC

technical committees collaborate in fields of mutual interest. Other international organizations, governmental

and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information

technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of the joint technical committee is to prepare International Standards. Draft International

Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as

an International Standard requires approval by at least 75 % of the national bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO/IEC 28361 was prepared by Ecma International (as ECMA-373) and was adopted, under a special “fast-

track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology, in parallel with its

approval by national bodies of ISO and IEC.
iv © ISO/IEC 2007 – All rights reserved
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ISO/IEC 28361:2007(E)
Introduction

Following the standardisation of Near Field Communication (NFC) systems and their test methods in Ecma

International, this International Standard specifies a two-wire interface between two components called

“Transceiver” and “Front-end”. Systems that implement the NFC-WI interface can thus be augmented with, for

example, a wireless Front-end for NFCIP-1 as illustrated in Figure 1. Although this International Standard only

specifies requirements for the Signal-In and Signal-Out wires and the digital signals they carry, informative

Annex A lists some NFCIP-1 specific considerations.
NFC Wired
Interface
(NFC-WI)
NFC NFC
Signal-Out
Transceiver
Front-End Device (e.g. NFCIP-1)
Signal-In
Out of Scope Out of Scope
In scope
Figure 1 — Context diagram for the NFC wired interface
© ISO/IEC 2007 – All rights reserved v
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INTERNATIONAL STANDARD ISO/IEC 28361:2007(E)
Information technology — Telecommunications and information
exchange between systems — Near Field Communication Wired
Interface (NFC-WI)
1 Scope

This International Standard specifies the digital wire interface between a Transceiver and a Front-end. The

specification includes the signal wires, binary signals, the state diagrams and the bit encodings for three data

rates.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
Clock

sequence of LOW and HIGH as defined in 3.2 with duration of 1/(2*f ), where f is the clock frequency as

CLK clk
defined in 6.3
2.2
Information
bit-coded data as defined in Clause 8
2.3
Front-end
entity that drives the Signal-Out wire and receives on the Signal-In wire
2.4
Transceiver
entity that drives the Signal-In wire and receives on the Signal-Out wire
3 Conventions and notations
3.1 Representation of bit values
Bit values are either ZERO or ONE.
3.2 Representation of logical states of LOW and HIGH

⎯ The logical signal state is LOW if the electrical level of a signal has the input voltage of V or the output

voltage of V as specified in Table 1 in 6.2.

⎯ The logical signal state is HIGH if the electrical level of a signal has the input voltage of V or the output

voltage of V as specified in Table 1 in 6.2.
© ISO/IEC 2007 – All rights reserved 1
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ISO/IEC 28361:2007(E)
3.3 Capitalisation of names

The initial character of names of basic elements, e.g. specific fields, is capitalised.

3.4 State notation
The states are specified in Unified Modelling Language (UML) notation.
4 Symbols and abbreviated terms
AND Logical AND operation
f Clock frequency as defined in 6.3
CLK
NFC-WI Near Field Communication Wired Interface
OR Logical OR operation
XOR Logical XOR operation
÷ Divide a clock frequency by a constant value.
Table 1 in 6.2 list additional symbols for electrical characteristics.
5 General

The NFC-Wired Interface (NFC-WI) specifies the Signal-In and the Signal-Out wires as illustrated in Figure 2.

The wires carry binary signals of HIGH and LOW.
NFC Wired
Interface
(NFC-WI)
NFC NFC
Signal-Out
Transceiver
Front-End
Signal-In
In scope
Figure 2 — NFC-WI

The combinations of the signals on the wires make up the NFC-WI states as defined in Clause 7.

Clause 8 specifies encodings for Information transfer, while in the On state, for the f /128, f /64 and

CLK CLK
f /32 data transfer rates.
CLK

Annex A lists NFCIP-1 specific considerations for implementing the NFC-WI; Annex B lists possible uses of

the Command state, such as changing to alternative protocols.
2 © ISO/IEC 2007 – All rights reserved
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ISO/IEC 28361:2007(E)
6 Signals
6.1 Signal wires
6.1.1 Signal-In

The Transceiver drives the Signal-In wire with a binary signal of HIGH and LOW. The Front-end receives the

binary signal on Signal-In.
6.1.2 Signal-Out

The Front-end drives the Signal-Out wire with a binary signal of HIGH and LOW. The Transceiver receives the

binary signal on Signal-Out.
6.2 Electrical characteristics

The wires shall carry (binary) digital signals as illustrated in Figure 3 and specified in Table 1.

Figure 3 — Illustration of some electrical parameters
Table 1 — Electrical characteristics
Symbol Parameter Conditions Min Max Unit
DC Characteristics
V Signalling voltage amplitude Not applicable 1,62 3,63 V
V HIGH level input voltage Not applicable 1,10 3,63 V
V LOW level input voltage Not applicable 0 0,70 V
Input voltage is between V ± 4 mA
ILmin
I Input leakage current
and V
IHmax
V HIGH level output voltage Driver source current of 4mA 1,32 3,63 V
V LOW level output voltage Driver sink current of 4mA 0 0,30 V
© ISO/IEC 2007 – All rights reserved 3
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ISO/IEC 28361:2007(E)
AC Characteristics
Signal-In, Signal-Out rise time Add an external capacitive load 4 20 ns
(from 10 % to 90 % of V ) between 10 pF and 30 pF for testing
Signal-In, Signal-Out fall time (from Add an external capacitive load 4 20 ns
90 % to 10 % of V ) between 10 pF and 30 pF for testing
Pulse width of spikes and glitches Not applicable 1 ns
t which must b
...

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