SPRADC8 june   2023 AM625-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Graphics Performance
  6. 3DSS Features
  7. 4Relevance of Functional Safety for Automotive Cluster Tell-tale Applications
  8. 5Safety Features on TI Sitara AM62x Processor
  9. 6Application-specific Task Partitioning and Safety Concept for Tell-tales
    1. 6.1 Common Cause Failures
  10. 7 TI’s Functional Safety Offerings
  11. 8Summary
  12. 9References

4 Relevance of Functional Safety for Automotive Cluster Tell-tale Applications

Auto manufacturers use the digital instrument cluster to display safety critical information using audio or visual alerts. To tie the safety criticality of an application to a certain ASIL safety integrity level, following the ISO 26262 standard, OEMs have to perform HARA (Hazard Analysis and Risk Assessment) where the various malfunctions leading to system hazards and the associated risk is analyzed. Performing this analysis and assessment leads to understanding safety goals linked to the application. The safety goals considered for the cluster tell-tales are related to avoiding unreasonable risk due to unintended activation of tell-tales, due to faulty tell-tales being displayed or due to absence of tell-tale notification when the display of the information is needed. Based on severity, exposure and controllability of the hazards, cluster tell-tale applications typically target ASIL-B safety integrity levels, following the ISO 26262 standards, shown in Table 4-1.

Table 4-1 Required Targets for ASIL Performance
Standard ASIL PMHF SPFM LFM
ISO 26262 A < 1000 FIT N/A N/A
B < 100 FIT ≥ 90% ≥ 60%
C < 100 FIT ≥ 97% ≥ 80%
D < 10 FIT ≥ 99% ≥ 90%