Hardware Engineering in ISO 26262

Hardware engineering in ISO 26262 is governed by Part 5, which defines product development at the hardware level for electrical and electronic systems in road vehicles. It covers deriving hardware safety requirements from the technical safety concept, hardware architectural and detailed design, the evaluation of hardware architectural metrics (SPFM and LFM) and of safety goal violations due to random hardware failures (PMHF), and hardware integration and verification. The required rigor scales with ASIL: higher integrity levels demand stronger safety mechanisms, higher diagnostic coverage, and stricter metric targets, all backed by documented analysis.

They are the three quantitative measures of ISO 26262-5. The single-point fault metric (SPFM) measures how well the design is protected against faults that directly violate a safety goal. The latent fault metric (LFM) measures coverage of faults that stay hidden until a second fault arrives. The probabilistic metric for random hardware failures (PMHF) is the residual probability of violating a safety goal, evaluated against ASIL-dependent targets. The course presents each formula, shows the calculation workflow, and then compares targets against achieved values in the ASIL D brake control case study.

The hardware design chapter covers the workhorse mechanisms of safety-related electronics: watchdog timers that detect a stalled or misbehaving controller, dual-channel architectures that allow cross-checking or safe takeover, and memory protection that contains corruption. Around these sit measures such as redundant sensing, plausibility checks, and diagnostics that raise the diagnostic coverage credited in the metrics. The course pairs each mechanism with its design rationale so you can argue why a given combination is sufficient for the target ASIL rather than adding redundancy by reflex.

Because they are the two classic ways redundant hardware fails together. A common cause - shared supply, shared clock, thermal coupling, a common design fault - can defeat a dual-channel architecture on paper metrics alone, so the course covers CCF analysis, independence evidence, and the realistic effectiveness of mitigations. EMC matters because electromagnetic disturbance is a systematic stressor that can upset both channels simultaneously; the EMC chapter maps the standards landscape and shows how immunity margins over frequency are assessed for safety-critical hardware.

The course has 18 chapters spanning the full ISO 26262-5 scope: overview and standard structure, lifecycle and requirements engineering, hardware design and safety mechanisms, verification and validation, safety analysis with the SPFM/LFM/PMHF formulas, qualification routes, process flow, tools, meetings, requirement rationale, CCF and independence, EMC, references, and best practices. It includes six worked example systems from airbag ECU to ADAS camera and closes the loop with an ASIL D brake control case study comparing metric targets against achieved values.