DSPRelated.com
Forums
   Forums    More Forums    c6x  

C6711 DSK not working

Started by Ramanan ●November 5, 2004
Dear Experts,
 
    I have a C6711 DSK board which I used before an Year (It was working properly by that time). When I tried to use that board now, it refuses to start up. The start up routine is not running and the board is not detected when I open the code composer.
 
  1. Its taking 350 mA of current when I gave a supply of 5V - Do the normal boards take this much current?
  2. 1.6 V is measured in multimeter when i probed it at 3.3V test points. - What might be causing this? The regulator has blown or any other part is loading?
  3. 5V and 1.8V points measures correctly.
  4. When I press the reset push button, reset_active LED is not glowing.
    Your help in this regard will be highly appreciated.
 
Thanks,
Ramanan.
Reply by Mike Dunn ●November 7, 20042004-11-07
Hello Ramanan,
 
Thank you for doing an excellent job of analyzing your problem.  It looks like you are correct and might have a problem in your 3.3v power supply.
 
If my memory is correct, it seems like the 6711 DSK draws about 750 ma during normal operation.  My *guess* is the the "switcher isn't switching in your regulator" [ie something in your regulator circuit, as shown on sheet 18 of the schematics, is blown]. 
 
I have seen a few different problems occur from not stroing the board in the antistatic bag.  Tossing it in a box or drawer with a bunch of "paper stuff" can cause problems from ESD. 
 
With careful analysis [and possibly a reference board] and a scope you may be able to isolate the component. 
 
mikedunn
 

Ramanan <r...@solitonautomation.com> wrote:
Dear Experts,
 
    I have a C6711 DSK board which I used before an Year (It was working properly by that time). When I tried to use that board now, it refuses to start up. The start up routine is not running and the board is not detected when I open the code composer.
 
  1. Its taking 350 mA of current when I gave a supply of 5V - Do the normal boards take this much current?
  2. 1.6 V is measured in multimeter when i probed it at 3.3V test points. - What might be causing this? The regulator has blown or any other part is loading?
  3. 5V and 1.8V points measures correctly.
  4. When I press the reset push button, reset_active LED is not glowing.
    Your help in this regard will be highly appreciated.
 
Thanks,
Ramanan.


_____________________________________
Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer.  You need to do a "reply all" if you want your answer to be distributed to the entire group.

_____________________________________
About this discussion group:

To Join:  Send an email to c...@yahoogroups.com

To Post:  Send an email to c...@yahoogroups.com

To Leave: Send an email to c...@yahoogroups.com

Archives: http://www.yahoogroups.com/group/c6x

Other Groups: http://www.dsprelated.com




Reply by Ramanan ●November 9, 20042004-11-09
Hello Mike Dunn, Shekhar and Other experts,
 
    Thanks for the valuable information. You are right that the problem is caused because I was not storing the DSK in the antistatic bag. Now we have decided to desolder the 3.3V regulator area completely and then resolder new components. I shall let you know whether this solved the problem.
 
Thanks,
Ramanan.
----- Original Message -----
From: Mike Dunn
To: Ramanan ; c...@yahoogroups.com
Sent: Sunday, November 07, 2004 9:34 PM
Subject: Re: [c6x] C6711 DSK not working

Hello Ramanan,
 
Thank you for doing an excellent job of analyzing your problem.  It looks like you are correct and might have a problem in your 3.3v power supply.
 
If my memory is correct, it seems like the 6711 DSK draws about 750 ma during normal operation.  My *guess* is the the "switcher isn't switching in your regulator" [ie something in your regulator circuit, as shown on sheet 18 of the schematics, is blown]. 
 
I have seen a few different problems occur from not stroing the board in the antistatic bag.  Tossing it in a box or drawer with a bunch of "paper stuff" can cause problems from ESD. 
 
With careful analysis [and possibly a reference board] and a scope you may be able to isolate the component. 
 
mikedunn
 

Ramanan <r...@solitonautomation.com> wrote:
Dear Experts,
 
    I have a C6711 DSK board which I used before an Year (It was working properly by that time). When I tried to use that board now, it refuses to start up. The start up routine is not running and the board is not detected when I open the code composer.
 
  1. Its taking 350 mA of current when I gave a supply of 5V - Do the normal boards take this much current?
  2. 1.6 V is measured in multimeter when i probed it at 3.3V test points. - What might be causing this? The regulator has blown or any other part is loading?
  3. 5V and 1.8V points measures correctly.
  4. When I press the reset push button, reset_active LED is not glowing.
    Your help in this regard will be highly appreciated.
 
Thanks,
Ramanan.


_____________________________________
Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer.  You need to do a "reply all" if you want your answer to be distributed to the entire group.

_____________________________________
About this discussion group:

To Join:  Send an email to c...@yahoogroups.com

To Post:  Send an email to c...@yahoogroups.com

To Leave: Send an email to c...@yahoogroups.com

Archives: http://www.yahoogroups.com/group/c6x

Other Groups: http://www.dsprelated.com