help with current sense and voltage divider

Discussion in 'General Electronics Chat' started by cvrider, Feb 7, 2008.

  1. cvrider

    Thread Starter New Member

    Dec 3, 2007
    9
    0
    I am trying to use the Cirrus Logic CS5466 to calculate power usage in household electronics. I am using the basic circuit shown on page 14 of the 5466 datasheet:

    http://www.cirrus.com/en/pubs/proDatasheet/CS5466_F1.pdf

    Since I don't have a strong background in electronics can anyone help choose the correct resistors and caps for the voltage divider and current sense (shunt) circuits that are used as inputs. A standard house, of course, has 120V AC, 20 amp, 60Hz circuits.

    Any help with choosing these values would be appreciated. Or even how to connect transformers here instead.
     
  2. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1
    i will refer you to out forum ebooks volumes: volume 1 - DC. just scroll all the way down of this page:)

    moz
     
  3. cvrider

    Thread Starter New Member

    Dec 3, 2007
    9
    0
    It really doesn't explain the purpose of the Capacitors in the circuit diagram I have. Is there a reference which will better explain this?
     
  4. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    cvrider,

    I don't really understand the input capacitors well, but I am guessing that the cap across the inputs help compensate for mismatches of Rin and Cin, which I suspect are used to create a first-order lowpass.

    You should use the recommended values given in the eval. board datasheet, follow the schematics :)

    http://www.cirrus.com/en/pubs/rdDatasheet/CDB5466U_DB1.pdf

    Steve
     
  5. cvrider

    Thread Starter New Member

    Dec 3, 2007
    9
    0
    Looking at the eval board schematic is a great idea. Thanks.
     
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