topic SBC fault detection in Power Management

SBC fault detection

witness248 — Wed, 30 Apr 2025 05:55:44 GMT

hi, experts

Now we are working on SBC FS6513, and MCU is S32K324. and regarding the SBC fault detection, I have following questions:

1)what kind of SBC fault shall we detect in normal case? such as self-test fail, communication error, over voltage, under voltage and so on..

2)how can we detect above fault(DTC report is required), only read DIAG register is enough?

3)is there any fault which will shut off regulator? in this case, MCU will not work.

Re: SBC fault detection

JozefKozon — Wed, 30 Apr 2025 07:43:49 GMT

Hi Withness,

first please let me inform you, that for the the S32K3xx MCU family the recommended SBCs are newer FS26 and FS23. Please refer to this link.

To your questions.

1)what kind of SBC fault shall we detect in normal case? such as self-test fail, communication error, over voltage, under voltage and so on.

[A] In Normal operation, please check the RSTB, FS0B pins, depending on the WD_IMPACT_1:0 bits setting. If default, then only the RSTB pin.

Then you can periodically check all the DIAG registers for faults.

2)how can we detect above fault(DTC report is required), only read DIAG register is enough?

[A] Yes, only the DIAG registers are enough for the FS65.

3)is there any fault which will shut off regulator? in this case, MCU will not work.

[A] We have FMEDA (Failure Mode Effects and Diagnostic Analysis) reports describing detailly impacts of the faults. Please download the documents from the FS65 product page, under the Secure section. Please also check the Safety Analysis Report.

High temperature fault will shutdown individual regulators.

With Best Regards,

Jozef

Re: SBC fault detection

witness248 — Wed, 30 Apr 2025 08:43:57 GMT

hi，Jozef

Thanks so much for your kind reply. I have one another question, how can we test the SBC fault? is there any safety lib code or any other method we can refer?

Re: SBC fault detection

JozefKozon — Wed, 30 Apr 2025 10:30:46 GMT

Hi Witness,

for the fault tests description please refer to the Safety Manual attached.

With Best Regards,

Jozef