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Avnet Boards Blog UltraZed EG and EV cold start issue (-40C), fix and ECN info
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  • Author Author: ctammann
  • Date Created: 22 Dec 2021 8:53 PM Date Created
  • Views 1427 views
  • Likes 4 likes
  • Comments 1 comment
  • ultra96-v2
  • infineon
  • ultrazed-ev
  • ultrazed
  • avnet
  • xilinx
  • irps5401
  • ultrazed-eg
  • ultra96
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UltraZed EG and EV cold start issue (-40C), fix and ECN info

ctammann
ctammann
22 Dec 2021

I mentioned in a previous post that we were investigating a cold start issue on some Avnet products related to a spec change to the IRPS5401 PMIC from Infineon. To learn more about the issue please check out my previous blog - /technologies/power-management/b/blog/posts/irps5401-pmic-cold-start-spec-change

This issue only presents itself at -40C, which means it only affects the industrial temp Ultra96-V2, UltraZed EG and EV SOMs. The commercial temp grade SOMs and carriers do not have the issue, however we do use the same PCB for both varieties so in the case of the UltraZed SOMs, a board spin was required. I have attached a zip file to this blog that contains both ECN documents for the EV and EG SOMs.

The simple explanation is that a timing change was needed at cold temp. On the Ultra96-V2, we had extra time available to slow down the supply startups to meet the requirement. On the UltraZed platforms we implement the sequencing using timing delays from startup. Because of this sequencing / timing architecture, we did not have enough time left to delay the start up sequence long enough to meet the new requirement. There is a maximum time delay limit for startup from "enable", while we had margin to work with on Ultra96-V2, since the UltraZed platform has more rails as well as a carrier that require additional timing delays, the only way to meet the new timing requirement and not violate maximum delay constraints was to add an RC delay to the initial startup signal. Please review the attached ECNs, if you have any questions or concerns please don't hesitate to comment or reach out and I can provide more details.

Thanks
Chris

UltraZed cold start ECN.zip
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  • Bilalertekin
    Bilalertekin over 2 years ago

    Hello,
    Product Change Notification was published in December 2021. UltraZed-EV's official page has schematics dated 2018. Are there new schematics somewhere?

    www.avnet.com/.../Product Change Notification PCN 21010 (UZEV thermal).pdf

    www.avnet.com/.../ultrazed-ev

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