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MC34709 GLBRST pin working inconsistantly

Question asked by PAUL WEICHELT on Jul 30, 2015
Latest reply on Aug 3, 2015 by PAUL WEICHELT

We have a reset button connected to the GLBRST on our

MC34709. The reset button is working intermittently/inconsistently.

We have the register set to 4 second hold to initiate a reset. At

various times we get the following results:

 

  1. Hold the button for 4 seconds and the unit stays
    in reset until the button is released. (This is the operation we expect.)
  2. Hold the button for 4 seconds and the unit
    resets without releasing the button.
  3. Hold the button for 4 seconds and the unit won’t
    come out of reset until the power is cycled. All voltages stay low and the
    atlas never powers up or releases reset.

 

Some boards always exhibit behavior 3 above. Some boards exhibit behavior

1 or 2 above until they warm up (core temp of 120-130F) and then they start

exhibiting 3.

Outcomes