ISO 17987-4:2025 PDF

Road vehicles — Local Interconnect Network (LIN) — Part 4: Electrical physical layer (EPL) specification 12 V/24 V

Open preview (PDF)

Title (English):

ISO 17987-4:2025

Road vehicles — Local Interconnect Network (LIN) — Part 4: Electrical physical layer (EPL) specification 12 V/24 V

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 43
Publication date:: June 4, 2025
Edition:: ISO IS 17987 edition 2 version 1
ICS:: 43.040.15

Delivery type:

Full version25 €Read online 24h10 €Read online 72h15 €

Document language:

enru

Delivery time:Immediate download

Price:25 €

Description (English):

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. Annex A provides recommendations on the LIN physical layer peripheral interface design of type UART and frame controller for commander and responder nodes. This document includes the definition of electrical characteristics of the transmission itself and also the documentation of basic functionality for bus driver devices. This document also provides the physical layer definitions for nodes with LIN AA capabilities according to one of the procedures C, D and E. All parameters in this document are defined for the ambient temperature range from −40 °C to 125 °C.

Technical details

Technical committee: ISO/TC 22/SC 31 - Data communication
SKU: ISO 17987-4:2025

Abstract

Overview

ISO 17987-4:2025 - Road vehicles - Local Interconnect Network (LIN) - Part 4: Electrical physical layer (EPL) specification 12 V/24 V defines the electrical physical layer for LIN networks used in automotive systems. It specifies the 12 V and 24 V EPLs used for low-cost single-wire communication between electronic control units (ECUs) with bit rates up to 20 kbit/s. The standard covers electrical characteristics of transmission, basic bus-driver functionality, and physical layer variants for nodes with LIN AA capabilities (procedures C, D and E). All parameters apply across the automotive ambient range of −40 °C to 125 °C.

Key topics and technical requirements

The document addresses practical and testable EPL requirements, including:

Bit rate deviation and tolerance definitions for BR_Range_20K and BR_Range_10K systems (up to 20 kbit/s).
Timing requirements: bit timing, synchronization procedures and bit sampling timing for reliable UART-based LIN communication.
Line driver and receiver specifications: supply voltage definitions, signal specifications and bus-driver basic functionality for both 12 V and 24 V systems.
Line characteristics and bus capacitance considerations for single-wire networks referenced to ground.
Performance during fault modes and non-operation supply voltage ranges to ensure robustness in automotive environments.
ESD/EMI compliance references (normative reference includes IEC 61000-4-2).
LIN AA procedures C, D, E - normative annexes defining physical layer behaviour for advanced node capabilities.
Annex A (informative): recommendations for LIN peripheral interface design (UART and frame controller) for both commander and responder nodes.

Practical applications - who uses this standard

ISO 17987-4:2025 is essential for organizations designing, validating or integrating LIN physical layer hardware and systems:

Automotive ECU hardware and transceiver manufacturers (12 V / 24 V LIN transceivers and bus drivers).
Vehicle system architects and network integrators implementing LIN clusters for body electronics (doors, HVAC, seats, lighting).
Embedded firmware and UART peripheral designers implementing LIN commander and responder behaviour.
Test laboratories and compliance engineers performing conformance testing and EMC/ESD validation.
Tier-1 suppliers and OEMs specifying LIN EPL requirements for robust in-vehicle communication.

Related standards

ISO 17987-1: General information and use cases (LIN series overview)
ISO 17987-2, -3: Transport and logical protocol requirements
ISO 17987-5: LIN API and node configuration
ISO 17987-6, -7: Conformance tests and EPL testing
IEC 61000-4-2: ESD immunity testing

ISO 17987-4:2025 is the authoritative reference for implementing the LIN electrical physical layer (12 V/24 V), ensuring interoperability, durability and predictable behaviour across automotive ECUs and LIN networks.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

The document addresses practical and testable EPL requirements, including:

Bit rate deviation and tolerance definitions for BR_Range_20K and BR_Range_10K systems (up to 20 kbit/s).
Timing requirements: bit timing, synchronization procedures and bit sampling timing for reliable UART-based LIN communication.
Line driver and receiver specifications: supply voltage definitions, signal specifications and bus-driver basic functionality for both 12 V and 24 V systems.
Line characteristics and bus capacitance considerations for single-wire networks referenced to ground.
Performance during fault modes and non-operation supply voltage ranges to ensure robustness in automotive environments.
ESD/EMI compliance references (normative reference includes IEC 61000-4-2).
LIN AA procedures C, D, E - normative annexes defining physical layer behaviour for advanced node capabilities.
Annex A (informative): recommendations for LIN peripheral interface design (UART and frame controller) for both commander and responder nodes.

Practical applications - who uses this standard

ISO 17987-4:2025 is essential for organizations designing, validating or integrating LIN physical layer hardware and systems:

Automotive ECU hardware and transceiver manufacturers (12 V / 24 V LIN transceivers and bus drivers).
Vehicle system architects and network integrators implementing LIN clusters for body electronics (doors, HVAC, seats, lighting).
Embedded firmware and UART peripheral designers implementing LIN commander and responder behaviour.
Test laboratories and compliance engineers performing conformance testing and EMC/ESD validation.
Tier-1 suppliers and OEMs specifying LIN EPL requirements for robust in-vehicle communication.

Related standards

ISO 17987-1: General information and use cases (LIN series overview)
ISO 17987-2, -3: Transport and logical protocol requirements
ISO 17987-5: LIN API and node configuration
ISO 17987-6, -7: Conformance tests and EPL testing
IEC 61000-4-2: ESD immunity testing

ISO 17987-4:2025 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications - who uses this standard

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Practical applications - who uses this standard

Related standards

Related standards

Electromagnetic compatibility (EMC) - Part 4-20: Testing and measurement techniques - Emission and immunity t…

Tracked Changes. Road vehicles. Local Interconnect Network (LIN). General information and use case definition.

Tracked Changes. Road vehicles. Local Interconnect Network (LIN). Transport protocol and network layer servic…

Tracked Changes. Road vehicles. Local Interconnect Network (LIN). Protocol conformance test specification.