Vdda and Vddd

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cross mob
Anonymous
Not applicable

 Is there a chance that PSoC goes dead when the capacitor connected to Vdda is greater than Vdddmean to say Vddd rises early compared to Vdda? I have a board with capacitors for Vddd and Vdda are interchanged. the board was powered and PSoC didn't work. Later the capacitors wre interchanged according to spec but even then its not working. So is that my PSoC is gone????

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ETRO_SSN583
Level 9
Level 9
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There is an encyclopeida of replies to cover this toipic.

   

 

   

CMOS has a number of parasitic There is an encyclopedia of replies to cover this topic.

   

 

   

CMOS has a number of parasitic devices, normally “hidden” when things are biased and
started upin the right sequence.

   

 

   

My recommendation is to post a tech case, hopefully which will get looked at by silicon
designer, for an answer. Most datasheets now have specific sections of specs regarding
power sequencing, however missing explicit descriptions  as to why, what is actually
going on.

   

 

   

CMOS has “well isolation”  techniques, keeping devices from interacting, but  to the best
of my knowledge, they are all accompanied by parasitic devices that, under the right
circumstances, rear ugly heads, like the parasitic SCR mechanism that can produce a short
internally from Vdd to Vss and typically blows open the bond wire in Vdd or Vss to the
lead frame. Process technology actually takes into account the SCR trigger gain, beta, to
minimize its effects.

   

 

   

Regards, Dana.

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ETRO_SSN583
Level 9
Level 9
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Please Cypress lord, give me an HTML editor to revise my obvious post

   

typing errors. Like we have at www.psocdeveloper.com

   

 

   

Regards, Dana.

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Anonymous
Not applicable

 How to pose a tech case?? I have couple of things that are to be confimed with Cypress Engineers.

   

I don't know whether Cypress will answer some small queries.

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Anonymous
Not applicable

Go to "Contact Us" -> under "Create Service Request" click "Request technical or sales support via MyCases" for creating Tech support cases.

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ETRO_SSN583
Level 9
Level 9
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To file a tech case -

   

   

www.cypress.com

   

“Support”

   

“Technical Support”

   

“Create a Case”

   

 

   

Regards, Dana.

   

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ETRO_SSN583
Level 9
Level 9
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To create the request you must first establish an online account

   

at www.cypress.com, you will be prompted to fiull out a simple

   

profile.

   

 

   

Regards, Dana.

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Anonymous
Not applicable

 Have you got an answer for this?

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