[SI-LIST] Re: ESD failure - need advise

  • From: "Pommerenke, David" <davidjp@xxxxxxx>
  • To: "n.rameshhwde@xxxxxxxxx" <n.rameshhwde@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
  • Date: Tue, 23 Sep 2014 23:14:17 +0000

Group,

The best method to find the root cause of such soft-failure problem is to use 
local ESD scanning. The method is described in
Muchaidze, Giorgi, Jayong Koo, Qing Cai, Tun Li, Lijun Han, Andrew Martwick, 
Kai Wang, Jin Min, James L. Drewniak, and David Pommerenke. "Susceptibility 
scanning as a failure analysis tool for system-level electrostatic discharge 
(ESD) problems." Electromagnetic Compatibility, IEEE Transactions on 50, no. 2 
(2008): 268-276.

And can be performed by hand or automatically. You mainly need a transmission 
line pulser and some small probes. Best is if you use both E and H field 
probes. Then you move the probes close to your circuit and observe at which 
location the circuit will fail. It is very likely that the probe location and 
the sensitive parts of the circuit, or the regions that allow ESD transient 
fields to couple to the circuits are the same.

David 

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of Ramesh N
Sent: Tuesday, September 23, 2014 5:48 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] ESD failure - need advise

Hello Experts,
Greetings!!!
we are having ESD fail (in regulatory testing) in one of our design.
It's simple wireless DAQ system with 2 boards [controller PCB + LED/Sensor 
PCB]. FPC cable (5") is used as interconnect.Package is abs plastics.
Light-pipe is used for the for led indication. When +8kV is applied through air 
discharging, inadvertent LED trigger occurs . Randomly, system is also hanging 
when multiple zapping applied (especially for 8kV voltage level).
I have tried to limit airgaps, added filter caps, etc but issue is not entirely 
solved.

Is there any ESD simulation/analysis tool available for addressing this failure 
analysis?
Any help/debug tips related to this would be very helpful.

Thanks and regards,
Ramesh


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