ISO 11898-2:2024
(Main)Road vehicles — Controller area network (CAN) — Part 2: High-speed physical medium attachment (PMA) sublayer
Road vehicles — Controller area network (CAN) — Part 2: High-speed physical medium attachment (PMA) sublayer
This document specifies physical medium attachment (PMA) sublayers for the controller area network (CAN). This includes the high-speed (HS) PMA without and with low-power mode capability, without and with selective wake-up functionality. Additionally, this document specifies PMAs supporting the signal improvement capability (SIC) mode and the FAST mode in Annex A. The physical medium dependent (PMD) sublayer is not in the scope of this document.
Véhicules routiers — Gestionnaire de réseau de communication (CAN) — Partie 2: Sous-couche de l’unité d'accès au support à haute vitesse (PMA)
General Information
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Standards Content (Sample)
International
Standard
ISO 11898-2
Third edition
Road vehicles — Controller area
2024-03
network (CAN) —
Part 2:
High-speed physical medium
attachment (PMA) sublayer
Véhicules routiers — Gestionnaire de réseau de
communication (CAN) —
Partie 2: Sous-couche de l’unité d'accès au support à haute
vitesse (PMA)
Reference number
© ISO 2024
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 3
5 HS-PMA function . 4
5.1 Base requirements .4
5.2 HS-PMA test circuit .5
5.3 Static parameter .5
5.3.1 Maximum ratings of V , V and V .5
CAN_H CAN_L Diff
5.3.2 Recessive output characteristics, bus biasing active .6
5.3.3 Recessive output characteristics, bus biasing inactive .6
5.3.4 Dominant output characteristics .7
5.3.5 Maximum driver output current .8
5.3.6 PMA static receiver input characteristics, bus biasing active and inactive.9
5.3.7 Receiver input resistance .9
5.3.8 Maximum leakage currents of CAN_H and CAN_L .10
5.4 Dynamic parameter .11
5.4.1 Driver symmetry . .11
5.4.2 Optional transmit dominant timeout .11
5.4.3 Transmitter and receiver timing behaviour .11
5.5 Wake-up from low-power mode . 15
5.5.1 Wake-up procedures . 15
5.5.2 General requirement . . 15
5.5.3 Basic wake-up . 15
5.5.4 Via wake-up pattern . 15
5.5.5 Selective wake-up .18
5.5.6 Bus biasing procedure . 23
6 Conformance .25
Annex A (normative) HS-PMA with SIC mode and FAST mode .26
Annex B (informative) ECU and network design .55
Annex C (informative) PN physical layer modes .63
Bibliography .64
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31, Data
communication.
This third edition cancels and replaces the second edition (ISO 11898-2:2016), which has been technically
revised.
The main changes are as follows:
— Clause 5 is restructured, the parameters are categorized by static parameter and dynamic parameter;
— Table 13 with bit rates above 1 Mbit/s and up to 2 Mbit/s is in this edition Table 15 (parameter set
A). Table 14 with bit rates above 2 Mbit/s and up to 5 Mbit/s is now Table 16 (parameter set B). The
parameter set C (see Table 17 and Table 18) in this edition is newly introduced;
— Annex A in this edition is newly introduced; it specifies HS-PMAs with the SIC mode and the FAST mode.
Annex B and Annex C in this edition are Annex A and Annex B in the previous edition. The content is
unchanged.
A list of all parts in the ISO 11898 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
The ISO 11898 series provides requirement specifications for the CAN data link layer and physical layer. It
is intended for chip implementers, e.g. ISO 11898-1 for CAN protocol controllers and this document for CAN
transceivers. Related conformance test plans are given in the ISO 16845 series. The CAN data link layer
models the open system interconnect (OSI) data link layer; it is internally subdivided into logic link control
(LLC) and medium access control (MAC). ISO 11898-1 also specifies the CAN physical coding sublayer (PCS)
by means of the attachment unit interface (AUI). Optionally, the PCS also provides the PWM encoding to be
linked to a CAN SIC XL transceiver, which provides the PWM decoding.
The open system interconnect (OSI) layers above the data link layer (e.g. the network layer) are not specified
in the ISO 11898 series.
Figure 1 shows the relation between the OSI layers and the CAN sublayers.
Key
AUI attachment unit interface
MDI medium dependent interface
a
Only supported by CAN XL.
Figure 1 — CAN data link and physical sublayers relation to the OSI model
v
International Standard ISO 11898-2:2024(en)
Road vehicles — Controller area network (CAN) —
Part 2:
High-speed physical medium attachment (PMA) sublayer
1 Scope
This document specifies physical medium attachment (PMA) sublayers for the controller area network
(CAN). This includes the high-speed (HS) PMA without and with low-power mode capability, without and
with selective wake-up functionality. Additionally, this document specifies PMAs supporting the signal
improvement capability (SIC) mode and the FAST mode in Annex A. The physical medium dependent (PMD)
sublayer is not in the scope 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.
ISO/IEC 7498-1, Information technology — Open Systems Interconnection — Basic Reference Model: The Basic Model
1)
ISO 11898-1 , Road vehicles — Controller area network (CAN) — Part 1: Data link layer and physical signalling
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 7498-1, ISO 11898-1 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
active recessive
intermediate high-speed physical medium attachment (HS-PMA) output drive with a dedicated lower than
nominal impedance at transitions from dominant state or level_0 state towards the passive recessive (3.14)
state with a dedicated duration
3.2
attachment unit interface
AUI
interface between the physical coding sublayer (PCS) (3.15) and the physical medium attachment (PMA) (3.16)
sublayer
3.3
bus
shared medium of any topology
1) Third edition under preparation. Stage at the time of publication: ISO/DIS 11898-1:2024.
3.4
bus state
state of the medium dependent interface (MDI) (3.11), which is dominant or recessive if the physical medium
attachment (PMA) (3.16) sublayer is in arbitration mode, or is level_0 or level_1 otherwise
Note 1 to entry: The dominant state represents the log
...
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