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ATA6571 Safety Manual

Introduction

This manual discusses the requirements for the use of the ATA6571 devices as a Safety Element out of Context

(SEooC) in functional safety-relevant applications and provides guidelines for the proper use of ATA6571 devices in

ASIL B applications. It will guide the System Integrator with the necessary steps to integrate the product into their

application.

The System Integrator shall fulfill all the Assumptions of Use (AoU) listed in ,7. System Integrator Responsibilities

and for the selected diagnostics, all the Hardware Safety Requirements (HWSR) and Software Safety Requirements

(SWSR) listed in , and ,5. Hardware Requirements on System Level 6. Software Requirements on System Level

respectively. The AoU, HWSR and SWSR were assumed to be fulfilled when analyzing the failure rates and Fault

metrics in the provided FMEDA. The AoU are summarized in Section 11. Assumptions of Use (AoU).

If one or more AoU, HWSR or SWSR are not fulfilled, the System Integrator shall show that an alternative solution is

similarly efficient concerning the safety requirement in question or show that the particular issue is irrelevant for their

application (for example, the module is not used).

If these alternatives are not possible, the System Integrator shall estimate how much the failure rate increases and

the failure metrics decrease due to the deviation. Otherwise, the FMEDA provided with the ATA6571 devices is not

valid.

This Safety Manual refers to the International Standard ISO 26262, 2

nd Edition 2018.

MICROCHIP CONFIDENTIAL

FOR RELEASE ONLY UNDER NON-DISCLOSURE

AGREEMENT (NDA)

Table of Contents

Introduction.....................................................................................................................................................1

1. Abbreviations and Definitions..................................................................................................................4

2. Product Overview....................................................................................................................................9

2.1. Device Intended Use....................................................................................................................9

2.2. Supported Devices.......................................................................................................................9

2.3. Assumed Top-Level Safety Requirements................................................................................. 10

2.4. Internal Safety Mechanisms....................................................................................................... 11

2.5. Assumed Safe States.................................................................................................................13

2.6. Mission Profile............................................................................................................................14

3. Safety Measures................................................................................................................................... 15

4. Diagnostic Mechanisms........................................................................................................................ 17

4.1. CAN – Controller Area Network................................................................................................. 19

4.2. Monitoring of Failure Events.......................................................................................................25

4.3. MCU Self-Test............................................................................................................................ 26

5. Hardware Requirements on System Level............................................................................................27

5.1. Summary of the Hardware Requirements.................................................................................. 27

5.2. HW_CONNECT_CAN_XCVR_NERR_OUTPUT_EXTERNAL_INTERRUPT_01..................... 27

5.3. HW_CONNECT_TXCAN_OUTPUT_INPUT_CAPTURE_01.....................................................28

6. Software Requirements on System Level.............................................................................................29

7. System Integrator Responsibilities........................................................................................................30

7.1. Device Management Recommendations................................................................................... 30

7.2. Safety-Related Application Schematics..................................................................................... 31

7.3. Controller Area Network (CAN) Usage ......................................................................................31

7.4. Monitoring of Failure Events.......................................................................................................32

8. Failure Rates and FMEDA.................................................................................................................... 33

9. Provisions Against Dependent Failures................................................................................................ 34

9.1. Internal Safety Mechanisms....................................................................................................... 34

10. Measures to Prevent Systematic Failures.............................................................................................35

11. Assumptions of Use (AoU)....................................................................................................................36

11.1. Assumptions on Technical Safety Requirements (for the ATA6571).......................................... 36

11.2. Assumptions on the System-Level Hardware Design................................................................ 38

11.3. Assumptions on the Application Software.................................................................................. 39

11.4. Assumptions of Use for Device Features...................................................................................40

11.5. Assumptions of Use Related to the FMEDA.............................................................................. 41

12. References............................................................................................................................................42

13. Revision History.................................................................................................................................... 43

Microchip Confidential: For Release Only Under Non-Disclosure Agreement (NDA)

The Microchip Website.................................................................................................................................44

Product Change Notification Service............................................................................................................44

Customer Support........................................................................................................................................ 44

Microchip Devices Code Protection Feature................................................................................................ 44

Legal Notice................................................................................................................................................. 45

Trademarks.................................................................................................................................................. 45

Quality Management System....................................................................................................................... 46

Worldwide Sales and Service.......................................................................................................................47