A number of assumptions must be made in order to calculate the safety metrics according to ISO 26262:2018 or IEC 61508:2010. The assumptions of use for the reference are detailed below:
- Confidence level applied to permanent FIT rates:
99%.
- Confidence level applied to transient FIT rates:
99%.
- Neutron flux: set to 1 (equivalent to exposure at sea level, as measured in New York City)
- Thermal management (Theta-Ja): 37.8°C/W
- Use case power: 2.11 W
- Safe vs non-safe: Permanent ROM faults, permanent package faults and permanent digital logic faults are considered 50% safe. Transient faults of digital logic are considered 50% safe. All other faults considered 0% safe.
- Operational (mission) profile used: IEC62380 Passenger Compartment Profile.
- Special considerations on pin level tailoring:
Use the Pin Level Tailoring tab to adapt to the specific
application.
- Special considerations on function and diagnostic
tailoring: If changes were done to the Pin Level Tailoring tab, update
the Function and Diag Tailoring tab to align accordingly.