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UCD90160A: UCD90XXX Warning, Faults, and Margin level setpoints philosophy

Part Number: UCD90160A

In reviewing this project that came from another engineer,... we noticed the setpoints for over/under fault is 15%, the over/under warnings are 10%, and margin Hi/Low is 5%.  

I am unclear on what the "margin" actually does and how it is used to shutdown the system.  I assume the warning level sets something in the log file (if enabled) that we could act on although it does not appear we are actually using it. I see the "fault response" configuration tab, so I understand how the UCD chip responds to those.  But where does margining come in?  and what does it actually do?  The fault levels seem to be the only things to shutdown.

I think they have the levels wrong, since the primary power for this UCD controls a Zynq SOC and I know the power requirements for that based on the datasheet.  It seems they have the margin levels set {exactly} to the limits in the znq datasheet - where I thought they would have wanted the fault levels. Unless the margin somehow can cause a shutdown.   

I searched this forum and some of the UCD (and fusion) application guides, but I must be missing where to actually look for this (too much information). The fusion tool itself should have a "help" link on each tab/page cause finding the information has been difficult.

LMK if anyone has any guidance/suggestions and/or if peoples planning on how they use these sequencers (for fault monitoring)

  • Hi

    Margining HIGH or LOW threshold is only available when performing margining test. you can ignore these two thresholds if margining function is not used. 

    15% or 10% is up to your system design and there is no fix value for the fault condition. whatever your design can tolerate is the limits.

    Just take example, for a 1.2V normal rail, what's highest voltage expected to keep system running? any value above that is the OV fault. the same can be applied on the lowest voltage case. 

    Please refer the below quick guide to understand more about how the fault response works.

    3223.UCD90xxx Quick Guide.pptx



  • Thanks. That is what I figured related to Margining... and I think they 'set' the limits incorrectly.