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Question asked by Maurizio Mittino on May 19, 2016

We are using a MC33909 as system basis chip for a microcontroller bord using MC52259CAG80.


System is working well in most of the time, but after some power on the MC33909 go in the "Normal request mode"  with SAFE_B low and we are not able to make it out from the state by the watch dog refresh as it should go.

Seems that it start in wrong way and no mode to recover it.


Note that when start up went well we are able to stop watch dog and restart it and MC33909 work as expected.

Attached scheme of the board.


It is available a bug list application note or others to help in fix the problem?