Automotive ASIC
AEC-Q100
AEC-Q100 establishes common quality-system standards for automotive electronics. AEC-Q100 is based on a set of standardized qualification test sequences for integrated circuits (ICs). Developed by the Automotive Electronics Council (AEC), the AEC-Q100 is an industry-standard specification that outlines the qualification requirements and procedures for new product development that involving Automotive integrated circuits.
Integrated circuits qualified to the AEC-Q100 requirements may be labeled with the following automotive temperature grades such as: AEC-Q100 Grade 0, Grade 1, Grade 2, Grade 3.
| ASIL Grade | Ambient operating temperature |
|---|---|
| 0 | -40°C to +150°C |
| 1 | --40°C to +125°C |
| 2 | -40°C to +105°C |
| 3 | -40°C to +105°C |
Automotive Safety Integrity Level
Automotive Safety Integrity Level (ASIL) is a risk classification system defined by the Functional Safety for Road Vehicles standard (ISO 26262). There are four levels of ASIL integrity requirements: ASIL A, ASIL B, ASIL C, ASIL D. The ASIL A indicates the lowest level of requirements with ASIL D indicating the highest level of requirements.
Example Automotive System ASILs
ASIL-A
- Rear Lights – Both side failure
ASIL-B
- Instrument Cluster – Loss of critical data
- Headlights – Both side failure
- Brake Lights – Both side failure
- Rear View Camera – No valid sensor data
- Active Suspension – Suspension oscillates (or ASIL-C)
- Parking Assist – No valid sensor data
- Inertial Navigation – No valid sensor data
ASIL-C
- Engine Management – Unwanted acceleration (or ASIL-D)
- Active Suspension – Suspension oscillates (or ASIL-C)
ASIL-D
- Airbag – Inadvertent deployment
- Engine Management – Unwanted acceleration
- Electric Power Steering – Self-steering
- Antilock Braking – Unintended full power braking
- Stability Control – Suspension oscillates
How do ASILs work?
The severity levels of ASIL are arrived at by performing a risk and hazard analysis assessment. Engineers measure three specific variables for each electronic component in a vehicle:
- Controllability (measure of how much the driver can do to prevent an injury)
- Severity (the type of injuries a failure could present to the driver and passengers)
- Exposure (how often is the vehicle exposed to this type of hazard)
Next, each of these variables (Controllability, Severity, and Exposure) are broken down into sub-classes.
Controllability
Controllability is an assessment of how easily the driver can react and prevent an injury to themselves or passengers in the event of an automotive component failure. The assessment ranges from the lowest impact of Simple to Control through Normal to Control to the highest impact of Uncontrollable.
Severity
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