MC33907 IO_45 error detection

[chshli]

Hi ,

     According to MC33907 UM,IO_45 error detection can lead to FS0B low.

     But what are the conditions of IO_45 error detection? And how to assert FS0B low by IO_4 fault inject?

Thanks

[TomasVaverka · Accepted solution]

Hi,

The error will be detected when IO_4=0 for >20us and IO_5=1 (no acknowledgement). In that case, FS0B is asserted low after 9.7ms (T_ACK_FS). To enable this, the IO_45_FS bit in the INIT_FSSM1 needs to be set to 1 ( = safety critical).

Please let me know if there are any other questions.

Regards,

Tomas

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