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2303826_en-US
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2303826_en-US
2303826_en-US
My customer has an issue with FS26 PMIC
- After enabling AFE LPCM successfully, FS26 PMIC enters LPOFF mode with wake polarity configured as High.
- During an under‑voltage fault, the ISOSPI asserts the INTR pin from Low to High.
- This INTR signal is connected in parallel to FS26 WAKE1 and S32K322 GPIO PTC12.
- However, when INTR transitions to High, the line only reaches around 600 mV, which is not sufficient for FS26 to exit LPOFF. Due to this, FS26 is not waking up.
I would suspect loading on the shared WAKE/INTR net (e.g., MCU pin not fully Hi‑Z or weak/OD INTR driver), but I would appreciate if any guidance or recommendation to fix issue.
Hi Allan (@AllanAn),
Could you please help with this question from our colleague Yuko-san?
Thanks & BRs, Tomas
Hi Yuko,
From your description, INTR too low leading to not reach FS26 WAKE pin high threshold, as a result, device did not wakeup.
I only suggest customer to have a high INTR voltage and I did not see any action from FS26 side, as it is customer responsibility to make sure wakeup signal should be valid within FS26 spec as attached.
Brs
Allan
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