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???
12/08/08 18:41
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 		 #160752 - Lethal ramp-down
Responding to: ???'s previous message
The ramp-down can be lethal to EEPROM contents. The application may not realize that the voltage is dropping, and may continue to write to the EEPROM even when the voltage is lower than allowed for a correct write. Note that the safe levels for the processor are not the same as the safe levels for EEPROM writes.

If no external supervisor is used, then it is important to look for a processor with a well-working brownout support.

List of 26 messages in thread
TopicAuthorDate
Decoupling capacitance can kill the regulator?            01/01/70 00:00      
   Yes, LDOs are sensitive...            01/01/70 00:00      
   and that's not all ...            01/01/70 00:00      
      was there a supervisor?            01/01/70 00:00      
         No ...            01/01/70 00:00      
            you have yourself posted re ....            01/01/70 00:00      
               as often happens ...            01/01/70 00:00      
                  who 'injected'?            01/01/70 00:00      
                     It's on you, Erik!            01/01/70 00:00      
                        what was 'injected'            01/01/70 00:00      
                           What I injected was potential failure modes ...            01/01/70 00:00      
                              not if Vdd drop below            01/01/70 00:00      
                                 This is not the place to argue that matter!            01/01/70 00:00      
                              reset vs supervisor            01/01/70 00:00      
                                 I think it is equally important that ...            01/01/70 00:00      
                                    Lethal ramp-down            01/01/70 00:00      
                                       a funny thing happened ...            01/01/70 00:00      
                                          Brownout interrupts can be nice            01/01/70 00:00      
                                 RESET is not germane to this thread            01/01/70 00:00      
      diode in reverse bias (from output to input)            01/01/70 00:00      
         The best way to pass the ce testing...            01/01/70 00:00      
      High frequency ripple            01/01/70 00:00      
         Use a LRC-lowpass-filter!            01/01/70 00:00      
            What kind of L in the filter?            01/01/70 00:00      
      Big caps at output were used in the past            01/01/70 00:00      
         They used large L in the input in the past, too            01/01/70 00:00      

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