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MPC5125 Power on Reset

Question asked by Luigi Benciolini on Apr 29, 2016
Latest reply on May 4, 2016 by Luigi Benciolini

In reference to a CPU board equipped with NXP MPC5125YVN400 we  found a malfunction at startup reset (PORESET)

The problem involves the boards equipped with processor with marking code QAT1535C.

Currently no problem are found on boards equipped with processor with marking code DAR1532AF.


Extending the reset time from 180mS up to 220mS (or more) the problem disappear; --> consider that the datasheet don't impose any constraint regarding the PORESET timing  (Obviously is requred that PORESET can be released after all the supplies reach the specified operating conditions).


Enclosed you find some oscilloscope screenshot


Thank You nn advance