Clarifications required regarding Fail safe oscillator drift Fault(FS_OSC_DRIFT)

Sivahari — Mon, 10 Aug 2026 13:48:15 GMT

Hi Nxp,

I have been using FS2613 SBC chip and I found safety requirement (SM48) which is related to Fail safe oscillator drift Fault (FS_OSC_DRIFT). But ASIL level information is not available in reference manual.

So, kindly clarify that, this fault comes under either ASIL B/ ASIL D/ QM?

Thanks,

Sivahari G

Re: Clarifications required regarding Fail safe oscillator drift Fault(FS_OSC_DRIFT)

RafaR — Mon, 10 Aug 2026 16:44:21 GMT

Hello Sivahari

Good day!

The FS_OSC_DRIFT fault (SM48) corresponds to the monitoring of the independent fail-safe oscillator used by the FS26 fail-safe state machine. According to the FS26 Safety Manual, this mechanism is implemented within the ASIL D fail-safe domain.

You can find this representation in Figure 8. Safety architecture.

I hope this information has helped you, please let me know if you need help with anything else.

Have a great day and best of luck.

topic Clarifications required regarding Fail safe oscillator drift Fault(FS_OSC_DRIFT) in Power Management

Clarifications required regarding Fail safe oscillator drift Fault(FS_OSC_DRIFT)

Re: Clarifications required regarding Fail safe oscillator drift Fault(FS_OSC_DRIFT)