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???
03/30/07 14:35
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Msg Score: +1
 +1 Good Answer/Helpful		 #136167 - Open Drain Output
Responding to: ???'s previous message
Sudeep:

When you check the SW output in the main power off mode it may be that there is no signal seen even if the output in fact is working. This is because this is an open drain output which is typically equipped with a pullup resistor to the main power. When you turn off the main power the pullup goes to GND and so no signal will be seen on this output pin.

To run a valid test to see if the SW output is actually working it is necessary to temporarily move the pullup over to the battery voltage.

- mkaras


List of 34 messages in thread
TopicAuthorDate
DS1307 back up problem            01/01/70 00:00      
   backup problem            01/01/70 00:00      
   To Pradheep            01/01/70 00:00      
      back up problem            01/01/70 00:00      
         Are you sure?            01/01/70 00:00      
   Are you sure...            01/01/70 00:00      
   Something else            01/01/70 00:00      
      To Jon            01/01/70 00:00      
         Have a look at this            01/01/70 00:00      
            seems?            01/01/70 00:00      
               Help me            01/01/70 00:00      
                  Extract fron the datasheet            01/01/70 00:00      
         Open Drain Output            01/01/70 00:00      
   Crystal            01/01/70 00:00      
      To a different kind?            01/01/70 00:00      
         crystal            01/01/70 00:00      
            In the link            01/01/70 00:00      
               pull up            01/01/70 00:00      
                  Yes, but...            01/01/70 00:00      
      Yes, looks like a poor crystal...            01/01/70 00:00      
         Power Up / Down            01/01/70 00:00      
            Problem Solved            01/01/70 00:00      
               Not so fast...            01/01/70 00:00      
                  'testing' revisited            01/01/70 00:00      
                     The same thought I !            01/01/70 00:00      
               request            01/01/70 00:00      
                  Learn to debug            01/01/70 00:00      
                     Very useful post, Andy!            01/01/70 00:00      
                        Other part of rule #1            01/01/70 00:00      
                        a great goal, do you achieve it every time ?            01/01/70 00:00      
                           Revision Letters            01/01/70 00:00      
                           Here's how            01/01/70 00:00      
                              and pay $25,000,000 to the descendants            01/01/70 00:00      
                        Hopefully, it leads that way            01/01/70 00:00      

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