GB/T 42691.4-2023 English PDF (GBT42691.4-2023)

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GB/T 42691.4-2023: Road vehicles -- Local Interconnect Network(LIN) -- Part 4: Electrical physical layer (EPL) specification 12 V/24 V
GB/T 42691.4-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.15
CCS T 36
GB/T 42691.4-2023 / ISO 17987-4:2016
Road vehicles - Local Interconnect Network (LIN) - Part 4:
Electrical physical layer (EPL) specification 12 V/24 V
(ISO 17987-4:2016, IDT)
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: DECEMBER 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 8
2 Normative references ... 8
3 Terms, definitions, symbols and abbreviated terms ... 8
3.1 Terms and definitions ... 8
3.2 Symbols ... 9
3.3 Abbreviated terms ... 13
4 Conventions ... 14
5 Electrical physical layer requirements ... 14
5.1 Bit rate deviation ... 14
5.2 Timing requirements ... 18
5.3 Line driver/receiver ... 20
Annex A (Informative) LIN peripheral interface design considerations ... 33
Bibliography ... 39
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020
Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents.
This document is Part 4 of GB/T 42691 Road vehicles - Local Interconnect Network
(LIN). The following parts have been issued for GB/T 42691:
-- Part 1: General information and use case definition;
-- Part 2: Transport protocol and network layer services;
-- Part 3: Protocol specification;
-- Part 4: Electrical physical layer (EPL) specification 12 V/24 V;
-- Part 5: Application programmers interface (API);
-- Part 6: Protocol conformance test specification;
-- Part 7: Electrical Physical Layer (EPL) conformance test specification;
-- Part 8: Electrical physical layer (EPL) specification: LIN over DC powerline (DC-
LIN).
This document is identical to ISO 17987-4:2016, Road vehicles - Local Interconnect
Network (LIN) - Part 4: Electrical physical layer (EPL) specification 12 V/24 V.
Please note that some of the contents of this document may involve patents. The issuing
organization of this document is not responsible for identifying patents.
This document was proposed by the Ministry of Industry and Information Technology
of the People’s Republic of China.
This document shall be under the jurisdiction of National Technical Committee on Road
Vehicles of Standardization Administration of China (SAC/TC 114).
Drafting organizations of this document: Great Wall Motor Company Limited, China
Automotive Technology and Research Center Co., Ltd., Pan Asia Technical Automotive
Center Co., Ltd., Geely Automobile Research Institute (Ningbo) Co., Ltd., FAW Car
Co., Ltd., SAIC MAXUS Automotive Co., Ltd., Dongfeng Motor Corporation,
Huizhou Desay SV Automotive Co., Ltd., FAW-Volkswagen, SAIC-GM-Wuling
Automobile, Beijing National New Energy Vehicle Technology Innovation Center Co.,
Ltd., CATARC (Tianjin) Automotive Engineering Research Institute Co., Ltd.
Main drafters of this document: Wang Tuo, Ji Guotian, Fan Ruhu, Zhu Tong, Qu Yunge,
Zhen Haichuan, Chuai Mengyang, Yan Dongdong, Li Min, He Jiecong, Lv Liang, Su
Road vehicles - Local Interconnect Network (LIN) - Part 4:
Electrical physical layer (EPL) specification 12 V/24 V
1 Scope
This document specifies the 12 V and 24 V electrical physical layers (EPL) of the LIN
communications system.
The electrical physical layer for LIN is designed for low-cost networks with bit rates
up to 20 kbit/s to connect automotive electronic control units (ECUs). The medium that
is used is a single wire for each receiver and transmitter with reference to ground. This
document includes the definition of electrical characteristics of the transmission itself
and also the documentation of basic functionality for bus driver devices.
All parameters in this document are defined for the ambient temperature range from -
40 °C to 125 °C.
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
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
IEC 61000-4-2, Electromagnetic compatibility (EMC) - Part 4-2: Testing and
measurement techniques - Electrostatic discharge immunity test
Note: GB/T 17626.2-2018, Electromagnetic compatibility (EMC) - Testing and
measurement techniques - Electrostatic discharge immunity test (IEC 61000-
4-2:2008, IDT)
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
BR_Range_20K
LIN systems which operate at speeds up to 20 kbit/s.
CMASTER and CSLAVE are defining the total node capacitance at the connector of an ECU
including the physical bus driver (transceiver) and all other components applied to the
LIN bus pin such as capacitors or protection circuitry. The number of nodes in a LIN
cluster shall not exceed 16. The network impedance may prohibit a fault-free
communication under worst case conditions with more than 16 nodes. Every additional
node lowers the network resistance by approximately 3 % (30 kΩ || ~1 kΩ).
5.3.7 12 V LIN systems: performance in non-operation supply voltage range
For VBAT > 18 V or VBAT < 8 V, the ECU may still operate, but communication is not
guaranteed. If an ECU is not intending to transmit on the LIN bus (e.g., transmit input
of a LIN transceiver is recessive), the LIN driver shall not drive the LIN bus to dominant
state. If the LIN bus is in recessive state, the LIN receiver output shall provide a
recessive state.
5.3.8 24 V LIN systems: performance in non-operation supply voltage range
For VBAT > 36 V or VBAT < 16 V for a BR_Range_20K system or for VBAT > 36 V or
VBAT < 8 V for a BR_Range_10K system, the ECU may still operate, but
communication is not guaranteed. If an ECU is not intending to transmit on the LIN
bus (e.g., transmit input of a LIN transceiver is recessive), the LIN driver shall not drive
the LIN bus to dominant state. If the LIN bus is in recessive state, the LIN receiver
output shall provide a recessive state.
5.3.9 Performance during fault modes
5.3.9.1 General requirements
All LIN device state changes on conditional events (e.g., temperature shutdown) shall
be specified in the LIN device data sheet.
5.3.9.2 Loss of supply voltage connection or ground connection
ECUs with loss of connection to either supply voltage or ground shall not interfere with
normal communication among the remaining LIN participants. Upon return of
connection, normal operation shall resume without any intervention on the LIN bus line.
5.3.9.3 12 V LIN systems: LIN systems bus wiring short to battery or ground
The network data communication may be interrupted but there shall be no damage to
any ECU when the LIN bus line is shorted to either positive battery with less than 26.5
V or GND. Upon removal of the fault, normal operation shall resume without any
intervention on the LIN bus line.
Note: The 26.5 V is specified to stay within the non-conducting range of the commonly
used 27 V Zener stacks.
5.3.9.4 24 V LIN systems: LIN systems bus wiring short to battery or ground