What makes the MCU ASIL compliant?

[rjmalmeida0]

Hi, I'm starting a project on one of the S32K boards, specifically the S32K116 board. I have read some information about the ISO 26262 but I still have some doubts about this norm. What makes the S32K boards ASIL B/D compliant? What kind of software/hardware does it have that categorizes them as "ASIL-B ISO26262 functional safety". Sorry if this is a stupid question, but I'm very fresh on the ASIL thing.

Regards,
Rui

[davidtosenovjan · Accepted solution]

Hi, ASIL certification is being above whole ECU/system level, so customer could develop ASIL-x compliant appliance with other devices, but such approach could be in-efficient, slow, expensive, complicated, and so on…

Functional safety and the ISO26262 standard define the general guidelines needed to fulfill the requirements for the different ASIL levels. In NXP we have a program called safe assure. For more information about this program and the devices see following link:

https://www.nxp.com/products/product-information/functional-safety-for-iso-26262-and-iec-61508:FNCTN...

“The SafeAssure program highlights selected solutions - including hardware and software - that are targeted for use in functional safety applications, enabling system designers to design with confidence and achieve their system-level design goals and standards compliance more efficiently.”

The S32 kit itself certainly is not ASIL compliant, it is just evaluation board. I am not aware we had an evaluation board being ASIL compliant as a whole.

The MCU itself is developed according safety standard:

https://www.nxp.com/docs/en/supporting-information/ISO-26262.pdf

Regarding SW, NXP or NXP partners can offers certain software (safety MCAL for instance).

Finally there are additional documents and tools, we says “safety support”. It is mainly safety manual, FMEDA and others. Details you may find here:

https://www.nxp.com/products/product-information/functional-safety-for-iso-26262-and-iec-61508:FNCTN...

That’s what makes MCU ASIL compliant.

[chen_jackcw]

Hi sir,

I have one question about ASIL-level, our customer requirement is to use ASIL-B compliant MCU, so we can choose S32K144. But this is only a hardware level meet the requirement. But for the software, we don't know if we can only use NXP provided freeRTOS to meet ASIL-B requirement, or we must choose a ASIL-level OS like AUTOSAT to meet requirement ?

The conclusion is if we want to meet  ASIL-B, then we should choose ASIL-B chip and ASIL-B software, or we just use ASIL-B chip with freeRTOS then we can still meet ASIL requirement,