[SI-LIST] Re: CPLD getting blown on board

  • From: steve weir <weirsi@xxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Fri, 07 Jun 2013 08:06:28 -0700

One more item to list to the many good suggestions offered:  Make sure 
that you don't have a power sequencing problem during shut-down as well 
as power on.  As it is during power up / power down your device fails, I 
would go after the power sequencing, VRM overshoot first.

Steve.
On 6/7/2013 5:38 AM, Sam Pete wrote:
> Hi Friends,
> I am working on a medical board which has multi-core CPU along with other 
> peripherals.
> we are getting into some issue that CPLD is getting blown out during power 
> cycle or sometimes during reset.
> out of 210 boards we produced, we have 3 boards exhibiting this issue. The FA 
> report from CPLD vendor says electrical over-stress...
> The board is not having any hotswap peripherals.... CPLD has 2.5V and 3.3V 
> banks, 3.3V Core/IO supply comes up first then 2.5V.
> We have gone thru all sorts of checks, negative tests etc., to reproduce this 
> issue and we were unsuccessful....
> Does anybody faced similar issues earlier? Appreciate if you can provide some 
> clues...
>
> thanks
> Sam
>
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