US5881 hall sensor On/Off switch circiut design help.plz

Discussion in 'The Projects Forum' started by fisal, May 18, 2011.

  1. fisal

    Thread Starter New Member

    Jul 3, 2010
    10
    0
    Can anyone help me to build a on/off switch circuit plz .
    i tried to follow the circuit diagram in the data sheet http://www.melexis.com/Assets/US5881-DataSheet-4824.aspx figure 12.2 two wire circuit 7th page ,but it did not work .i tried 100 ohm resistor and 100 k but did not work .
    should i use 1.2k ohm for Rb and Rl.
    plz if u know the answer plz let me know i already spent 3 days so far trying to figure the correct resistor values .
    V source =5
    I source max =1A
    or I can use 9 volt battery whichever easier for calculations.
    Thank you
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,765
    925
    post the schematic here. Most people do not want to 'link' to other places to see what you are doing. Post a picture of the circuit in THIS website.
     
    fisal likes this.
  3. mannycc

    New Member

    Dec 11, 2010
    17
    1
    Hi, what package youre using? could be wrong pin config?
     
  4. fisal

    Thread Starter New Member

    Jul 3, 2010
    10
    0
    i attached the schematic for the circuit,it is figure 12.2 Two-Wire Circuit.
    as far as the package am using it is US5881.
    my camera cant show the component of the circuit when taking pic.
    thank you .
     
  5. mannycc

    New Member

    Dec 11, 2010
    17
    1
    Hi, I can see that there are 2 types with different pin configurations probably need to check as a good start before you decide for biasing resistors based from your supply voltage.
    Rgds.
     
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  6. fisal

    Thread Starter New Member

    Jul 3, 2010
    10
    0
    i am using the UA package .
     
  7. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,343
    Hello,

    Circuit 12.2 of the datasheet is used to have different currents in the "power-line" of the sensing circuit.
    This is the way to sense a change in flux over two wires.
    It is NOT used to switch anything.

    [​IMG]

    What are you trying to do AND post your schematic?
    Also keep in mind that the US5881 can only switch 50 mA.

    Bertus
     
    Last edited: May 20, 2011
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