saej2602-2v001.pdf

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SURFACE

VEHICLE

RECOMMENDED

PRACTICE

LIN Network for Vehicle Applications Conformance Test

SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is

entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”

SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.

recording, or otherwise, without the prior written permission of SAE.

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SAE WEB ADDRESS: http://www.sae.org

Issued 2005-09

J2602-2

ISSUED

SEP2005

TABLE OF CONTENTS

Scope ..................................................................................................................................... 3

1.1 Mission/Theme....................................................................................................................... 4

1.2 Overview ................................................................................................................................ 4

1.3 Relationship to the LIN Conformance Test Specification ...................................................... 4

1.3.1

LIN OSI Layer 1 – Physical Layer.......................................................................................... 4

1.3.2 LIN OSI Layer 2 – Data Link Layer ........................................................................................ 5

1.3.3 Node Configuration / Network Management......................................................................... 5

1.3.4 LIN EMC Test Specification ................................................................................................... 5

1.4 Rationale ................................................................................................................................ 5

References............................................................................................................................. 5

2.1 Applicable Publications .......................................................................................................... 5

2.1.1

SAE Publications.................................................................................................................... 5

2.1.2 ISO Documents...................................................................................................................... 5

2.1.3 Supplier Publications.............................................................................................................. 5

2.1.4 Other Publications.................................................................................................................. 6

Definition of Terms ................................................................................................................. 6

3.1 Glossary ................................................................................................................................. 6

Acronyms, Abbreviations, and Symbols ................................................................................ 6

LIN System Requirements ..................................................................................................... 7

5.1 LIN Specification Package ..................................................................................................... 7

5.2 J2602 Serial Data Link Characteristics.................................................................................. 7

5.3 Detection of Errors by Master (ref Section 4.1, LIN 2.0 Protocol Specification).................... 7

5.4 Frame Processing by Slave Tasks (ref Section 4.2.2, LIN 2.0 Protocol Specification)......... 8

5.4.1

Slave Node Error Behavior .................................................................................................... 8

5.4.2 Slave Task in a Master Node Error Behavior ...................................................................... 11

5.5 Master and Slave Message Transmission Time Tolerance (ref. Section 2.2, LIN 2.0

Protocol Specification) ......................................................................................................... 12

5.6 LIN Product Identification (ref. Section 2.4, LIN 2.0 Diag and Config Specification)........... 13

SAE J2602-2 Issued SEP2005

- 2 -

5.7 Mandatory Node Configuration Requests (ref. LIN 2.0 Diag and Config Specification)...... 14

5.7.1

General Configuration Requirements .................................................................................. 14

5.7.2 NAD and Message ID Assignment ...................................................................................... 15

5.7.3 Targeted Reset .................................................................................................................... 21

5.7.4 Broadcast Reset Slave Response ....................................................................................... 21

5.8 Master and Slave Message Format..................................................................................... 23

5.8.1

Checksum (ref. Section 2.1.5, LIN 2.0 Protocol Specification)............................................ 23

5.8.2 Signal Consistency (ref. Section 1.2, LIN 2.0 Protocol Specification) ................................. 23

5.8.3 Signal Encoding Types (ref. Section 1.1, LIN 2.0 Protocol Specification)........................... 23

5.8.4 Signal Management ............................................................................................................. 23

5.8.5 Unused Bits in the Data Field (ref. Section 2.3, LIN 2.0 Protocol Specification) ................. 23

5.8.6 J2602 Slave Status Byte ...................................................................................................... 23

5.9 Message Types.................................................................................................................... 23

5.9.1

Availability of Unconditional Frames (ref Section 2.3.1, LIN 2.0 Protocol Specification) .... 23

5.9.2 Event Triggered Frames (ref. Section 2.3.2, LIN 2.0 Protocol Specification)...................... 23

5.9.3 Identifier Assignment (J2602-1 Requirement resulting from Event Triggered Frame

Anomaly) .............................................................................................................................. 23

J2602 API Requirements ..................................................................................................... 24

6.1 Master Node Configuration API ........................................................................................... 24

6.2 Diagnostic Transport Layer API ........................................................................................... 24

J2602 Bus Operation ........................................................................................................... 24

7.1 Normal Communication Mode and Transmission Rate ....................................................... 24

7.1.1

Master Node Bit Time Measurement ................................................................................... 24

7.1.2 Slave Node Bit Time Measurement ..................................................................................... 26

7.2 Sleep/Wake Mode in Master and Slave............................................................................... 28

7.2.1

Wake-up of Master and Slave (ref. Section 5.1, LIN 2.0 Protocol Specification) ................ 29

7.2.2 Go To Sleep (ref. Section 5.2, LIN 2.0 Protocol Specification)............................................ 30

7.3 LIN Controller Clock Tolerance............................................................................................ 30

7.4 Bus Electrical Parameters.................................................................................................... 31

7.4.1 LIN Bus Signals and Loading Requirements ....................................................................... 31

7.5 Master / Slave LIN Data Link (UART) Requirements .......................................................... 40

7.5.1

Sample Point........................................................................................................................ 40

7.5.2 Synchronization.................................................................................................................... 44

7.5.3 Transmit Message Buffering ................................................................................................ 44

7.6 LIN ECU Requirements........................................................................................................ 44

7.6.1

ECU Circuit Requirements................................................................................................... 44

7.6.2 Board Layout Requirements ................................................................................................ 45

7.7 Network Topology ................................................................................................................ 45

7.7.1

Loss of ECU Ground at Master or Slave Node.................................................................... 45

7.7.2 Loss of ECU Battery.............................................................................................................46

7.7.3 Bus Electrical Load Distribution ........................................................................................... 46

7.7.4 Bus Wiring Topology Configurations.................................................................................... 47

7.7.5 Bus Wiring Constraints......................................................................................................... 47

7.7.6 Bus Wiring Practices to Improve EMC Performance ........................................................... 47

7.7.7 Bus Wiring Harness and ECU Connectors .......................................................................... 47

7.8 Master / Slave ESD Immunity .............................................................................................. 47

7.9 Master / Slave EMC Testing Requirements......................................................................... 47

SAE J2602-2 Issued SEP2005

- 3 -

7.10 Fault Tolerant Modes ........................................................................................................... 47

7.10.1

ECU Power Loss – Master / Slave....................................................................................... 48

7.10.2 Bus Wiring Short to Ground – Master / Slave...................................................................... 49

7.10.3 Bus Wiring Short to Battery.................................................................................................. 50

7.10.4 Short / Open in Other Circuits.............................................................................................. 52

7.11 Ground Offset Voltage ......................................................................................................... 52

7.12 Operating Battery Power Voltage Range............................................................................. 52

7.12.1

Normal Battery Voltage Power Operation............................................................................ 52

7.12.2 Battery Power Over-Voltage Operation ............................................................................... 54

7.12.3 Low Battery Voltage Operation ............................................................................................ 55

7.12.4 Battery Offset Voltage ..........................................................................................................56

7.12.5 Reverse Battery Blocking Diode .......................................................................................... 56

7.13 Environmental Requirements............................................................................................... 56

7.13.1

Transmit Operating Conditions ............................................................................................ 56

Foreword

The objective of this document is to define a standard conformance test for J2602-1 devices.

The goal of this document is to define a basic conformance test for J2602-1 Master and Slave nodes that

can be used to determine the suitability of devices for use. This is not a complete Qualification test. This

does not replace the individual suppliers’ IC and/or module qualification.

1. Scope

This document covers the tests to be performed on all J2602-1 defined Master and Slave nodes. Tests

described in this document will ensure a minimum standard level of performance to which all compatible

ECUs and media shall be designed. This will assure full serial data communication among all connected

devices regardless of supplier.

The goal of SAE J2602-2 is to improve the interoperability and interchangeability of LIN devices within a

network by verifying the devices pass a minimum set of tests.

To allow for easy cross-reference, this document is arranged such that the conformance test for a given

section in J2602-1 is in the same section in J2602-2.

This document is to be referenced by the particular vehicle OEM component technical specification that

describes any given ECU in which the LIN data link controller and physical layer interface is located.

Primarily, the performance of the physical layer is specified in this document. ECU environmental and

other requirements, when provided in the component technical specification, shall supercede the

requirements of this document.

The intended audience includes, but is not limited to, ECU suppliers, LIN controller suppliers, LIN

transceiver suppliers, component release engineers and vehicle system engineers.

SAE J2602-2 Issued SEP2005

- 4 -

1.1 Mission/Theme

This serial data link network is intended for use in applications where high data rate is not required and a

lower data rate can achieve cost reductions in both the physical media components and in the

microprocessor and/or dedicated logic devices (ASICs) which use the network.

1.2 Overview

LIN is a single wire, low cost, Class A communication protocol. LIN is a master-slave protocol, and

utilizes the basic functionality of most Universal Asynchronous Receiver Transmitter (UART) or Serial

Communication Interface (SCI) devices as the protocol controllers in both Master and Slave devices. To

meet the target of “Lower cost than either an OEM proprietary communications link or CAN link” for low

speed data transfer requirements, a single wire transmission media based on the ISO 9141 specification

was chosen. The protocol is implemented around a UART/SCI capability set, because the silicon footprint

is small (lower cost). Many small microprocessors are equipped with either a UART or SCI interface

(lower cost), and the software interface to these devices is relatively simple to implement (lower software

cost). Finally, the relatively simplistic nature of the protocol controller (UART/SCI) and the nature of state-

based operation, enable the creation of Application Specific Integrated Circuits (ASICs) to perform as

input sensor gathering and actuator output controlling devices, in the vein of Mechatronics.

All message traffic on the bus is initiated by the Master device. Slave devices receive commands and

respond to requests from the Master. Since the Master initiates all bus traffic, it follows that the Slaves

cannot communicate unless requested by the Master. However, Slave devices can generate a bus

wakeup, if their inherent functionality requires this feature.

The “LIN Consortium” developed the set of LIN specifications. The Consortium is a group of automotive

OEMs, semiconductor manufacturers, and communication software and tool developers. The LIN

specification set is “released” by the LIN Steering Committee, a closed subset of the members.

Associate Consortium members contribute to the formation of the specifications through participation in

LIN Work Groups; however, the direction of the Work Groups and the final released content of the

specifications is the responsibility of the LIN Steering Committee.

The LIN Conformance Test Specification contains tests for the Physical Layer, Data Link Layer, Node

Configuration and Network Management, and EMC.

1.3 Relationship to the LIN Conformance Test Specification

The LIN Conformance Test Specification Package, version 1.0 dated August 1, 2004, consists of four

documents:

1.3.1 LIN

OSI LAYER 1 – PHYSICAL LAYER

The LIN OSI Layer 1 – Physical Layer Test Specification describes the tests to be performed on the

physical layer characteristics, including operating voltage range, signal threshold values, slope control,

propagation delay, power and ground voltage shifts, fault conditions, etc.

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