BQ78350-R1: PEC activation on BQ78350-R1

Hello,

Following communication problems with the BQ78350-R1 of our BMS (disturbances coming from 230V AC), I am trying to activate the PEC on the SMBus link.

I set the HPE bit to 1 in the SMB Configuration register (0x4462) and a reading confirms the correct writing.

The host consists of an STM23L496 where the PEC is activated on the SMBus controller.

In writing, the PEC is sent by the STM32. In reading, the value returned by the BQ78350-R1 is constantly at 0.

See the oscilloscope captures below

Writing (correct) :

Reading (PEC @ 0x00):

I can provide writing of the SMB Configuration register.

Thank you for your answer,
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