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???
01/18/06 15:24
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 		 #107705 - seems we have located it
Responding to: ???'s previous message
hi,

just for interest who [plane to] use Ramtron.

Oleg Sergeev said:

I wrote to Ramtron some times. They answered that:
"It seems that the PFI/PFO circuit is disabled somehow. And the SNL bit is being set inadvertantly. Both could be due to a Vdd power ramp that causes some strange behavior internally."

But I cannot understand one thing: if this derivative is specially designed to be processor companion with Power SuperVisor built-in so how may it fail from power ramp form???
As for now we look for statistics of fails to understand how to fix this situation.


Yes, we have located the problem.
FM31xx derivatives fail due certain power conditions. As a rule this failure destroys analog part which provides reset at power-up time itself. As result FM31xx does not set in known-state at power-up time and even manual reset after power up cannot help with this situation. To fix this failure we stop to use Power Fail Detector anymore and provide reset to FM31xx with external power supervisor aswell. (Here: reset pin of C8051F120 is tied to reset pin of FM31xx).

I will send this report to Ramtron soon.

Regards,
Oleg





List of 67 messages in thread
TopicAuthorDate
EEPROM to be used with the LPC936            01/01/70 00:00      
   Can you help Erik?            01/01/70 00:00      
   why not use CodeArchitect?            01/01/70 00:00      
      Yes            01/01/70 00:00      
   Part Number?            01/01/70 00:00      
      EEPROM or FRAM?            01/01/70 00:00      
         yes, costlier, but no worry about endura            01/01/70 00:00      
      I already answered            01/01/70 00:00      
         Ramtron problems            01/01/70 00:00      
            the reports of its death are greatly exa            01/01/70 00:00      
            re Ramtron problems            01/01/70 00:00      
            seems we have located it            01/01/70 00:00      
   bytes/bits?            01/01/70 00:00      
      PMPO            01/01/70 00:00      
         "RMS Power"            01/01/70 00:00      
            No such thing as RMS power            01/01/70 00:00      
         PMP0 = Pultry Meager Pathetic Offyatree            01/01/70 00:00      
      I got it!            01/01/70 00:00      
         you can stretch the endurance a lot by u            01/01/70 00:00      
            Wear Levelling            01/01/70 00:00      
   EEPROM to be used with the LPC936            01/01/70 00:00      
   Need help using SPI            01/01/70 00:00      
      "use code architect" and then drop half            01/01/70 00:00      
         I did not.            01/01/70 00:00      
            I do not know the reason, but maybe ther            01/01/70 00:00      
               Ironic!            01/01/70 00:00      
   Another Idea            01/01/70 00:00      
      ask andy            01/01/70 00:00      
         Thanks again            01/01/70 00:00      
            andy ayre            01/01/70 00:00      
               I tried LPC932            01/01/70 00:00      
                  just strikes me, write a small program t            01/01/70 00:00      
   I did yesterday            01/01/70 00:00      
      Hmm..            01/01/70 00:00      
         I tried to find it            01/01/70 00:00      
            then do so            01/01/70 00:00      
               I did exactly that            01/01/70 00:00      
                  I know that            01/01/70 00:00      
                     I am using 93LC46/56/66            01/01/70 00:00      
                        have you tried MOSI connected to MISO            01/01/70 00:00      
                           I don't            01/01/70 00:00      
                              yes            01/01/70 00:00      
                                 Nothing            01/01/70 00:00      
                                    no pullup needed, configure MOSI            01/01/70 00:00      
                                       That is what I have            01/01/70 00:00      
                                          :)            01/01/70 00:00      
                                             Pins            01/01/70 00:00      
                                                you are right            01/01/70 00:00      
                                                Thanks a lot            01/01/70 00:00      
                                                   could it be            01/01/70 00:00      
                                                      I used CA            01/01/70 00:00      
                                                         have you removed the eeprom, if not do            01/01/70 00:00      
                                                            I did,            01/01/70 00:00      
                                             It Worked Guys            01/01/70 00:00      
   I've got it            01/01/70 00:00      
      SS ignore            01/01/70 00:00      
         Why?            01/01/70 00:00      
            Ignore            01/01/70 00:00      
   Erik, one more question!            01/01/70 00:00      
      why this            01/01/70 00:00      
         Just to have something            01/01/70 00:00      
            well,            01/01/70 00:00      
               Maybe you can Help!            01/01/70 00:00      
                  sounds to me like patent avoidance SPI            01/01/70 00:00      
   It is the same or not?            01/01/70 00:00      
      I do not know and do not, at this time,            01/01/70 00:00      
         it's dawning on me            01/01/70 00:00      

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