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GB/T 42691.4-2023Road vehicles - Local Interconnect Network(LIN) - Part 4: Electrical physical layer (EPL) specification 12 V/24 V (English PDF)

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

May 23, 2023

Implementation date

December 1, 2023

Scope

GB/T 42691.4-2023 (Road vehicles - Local Interconnect Network(LIN) - Part 4: Electrical physical layer (EPL) specification 12 V/24 V) is available as an English-translated PDF.

GB/T 42691.4-2023 — 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 -

Document preview — GB/T 42691.4-2023

National Standard of the People's Republic of China

Issued by: SAMR; SAC

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.

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 kohm || ~1 kohm).

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

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.

Referenced standards

Normative references

IEC 61000 · GB/T 17626.2-2018

Cited by

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