PF82 Communication

[mehmetkaradag]

Tabii Mehmet, işte sorunu NXP Community forumunda İngilizce olarak sorabileceğin bir şekilde yazıyorum:

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Question:
Hi,
I’m using an S32K MCU connected via I2C to a PF8201 PMIC. In my system, the PF8201 is powered by a separate PMIC (FS56), so the VDDIO rail is always supplied properly. However, if the PF8201 enters fail-safe state (due to a critical fault like PU_FAIL or BIST error), will the I2C interface still be accessible to read the FAIL bits (e.g., PU_FAIL, WD_FAIL, REG_FAIL, TSD_FAIL)? Or does the PF8201’s state machine disable I2C register access entirely in fail-safe state? 

Can I still read registers like FAIL bits during the fail-safe state in this configuration? Or is I2C fully disabled once the device enters fail-safe?

Thank you in advance

[JozefKozon]

Hi Mehmet,

please refer to the section 13.1.9 in the PF8101_PF8201 datasheet. The FAIL bits can be read only in System-on state, which are only RUN and Standby state. So these bits cannot be read in Fail-Safe state. 

With Best Regards,

Jozef