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???
04/28/11 15:22
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 		 #182083 - LT
Responding to: ???'s previous message
Thanks a lot for comments.

LT looks great. It is 10+ USD. That is a major turn off, for a volume of 5000 units. It is possible to get the device imported, but it takes 2 weeks to get the component, and the process adds more dollars to the chip cost.

A flying capacitor sampling is going to be too complicated since I will have to use some FET to sample the input. Actually, I have seen a 10 year old system using relays to sample the voltage. Pretty slow, but it actually doesn't matter much in this case.

I guess I will have to go for the resistive divider method, subtracting the sum of cell voltages blow to arrive at the actual voltage. A 10 bit ADC should be able give me reasonable results, I suppose.

Thanking all of you again,

Raj Nambiar.

List of 37 messages in thread
TopicAuthorDate
Measuring cell voltages of batteries            01/01/70 00:00      
   Large currents            01/01/70 00:00      
   Yes, you can use a mux...            01/01/70 00:00      
   Use a MUX            01/01/70 00:00      
      Mux            01/01/70 00:00      
         Opto's for this application suck.            01/01/70 00:00      
            current issues            01/01/70 00:00      
         Use capacitive sampling            01/01/70 00:00      
            Normalizing cells            01/01/70 00:00      
   Linear Technology...            01/01/70 00:00      
      Others too.            01/01/70 00:00      
   AOs            01/01/70 00:00      
      Cost shouldn't be too important here            01/01/70 00:00      
      "AO" ??            01/01/70 00:00      
      Mux            01/01/70 00:00      
   Linear technology ...            01/01/70 00:00      
      Cross-reference            01/01/70 00:00      
   Another methode...            01/01/70 00:00      
      Something like that...            01/01/70 00:00      
         why bother mucking with such ....            01/01/70 00:00      
            A lot of reasons...            01/01/70 00:00      
               when so ....            01/01/70 00:00      
                  Raj should come back...            01/01/70 00:00      
         What a lot of components            01/01/70 00:00      
      There are lots of ways            01/01/70 00:00      
         LT            01/01/70 00:00      
            Pitfall...            01/01/70 00:00      
               precision and stability            01/01/70 00:00      
                  Stability            01/01/70 00:00      
                     True, Andy            01/01/70 00:00      
                        Can't use designs with lots of varying series resistors            01/01/70 00:00      
                           Number of resistors, Westermark            01/01/70 00:00      
                              You don't need to handle 360V by a divider            01/01/70 00:00      
                                 have you thought of V/Fs ?            01/01/70 00:00      
                                    no            01/01/70 00:00      
                              One voltage divider handles several cells in subchain            01/01/70 00:00      
                  AARGH            01/01/70 00:00      

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