Hello,
Thank you for using the NXP community.
I do recommend reviewing the S32K3 evaluations boards as a reference for your design.
As you noticed, all the solutions include a Safety SBCs (FS26) which is highly recommended to supply your MCU. The SBC or PMIC performs observations and control functionalities that are essential to fulfill some related functional safety requirements.
diazmarin09_0-1688146108795.png
I hope this information helps.
Regards,
David