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HMC1052

Discussion in 'Electronic Design' started by John, Sep 16, 2004.

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  1. John

    John Guest

    Sept. 16, 2004

    Hi all,

    In regard to HMC1052 magnetic sensor, is it really a weatstone bridge
    or they pictured it like one. In any event do you think would be best
    performed to excite it with a constant current or constant voltage
    excitation please. Thank you for your help in advance. In regard to
    R/S mode since it requires a 500mA current does a battery cell would
    it be able to handle it even for a short period.

    High regards,
    John.
     
  2. Dave VanHorn

    Dave VanHorn Guest

    The hall effect is about deflecting flowing charges, so it would seem to me
    that keeping the rate of charge flow the same would be ideal.
     
  3. The Reset / Set current can be dumped from a holding cap with a
    MOSFET. I have used this part and quite a few of the other HoneyWell
    parts. If you want an elegant solution that is already done and ready
    to go try the HMR3100 3 Axis module. It's about 50$ in small quan.

    If you get stuck email me and I will send you a Schematic on how to do
    your own but if you are in a hurry the HMR3100 is an accurate
    magnetometer.
     
  4. Paul Burke

    Paul Burke Guest


    It's a resistive Wheatstone bridge, with magnetorestrictive elements.
    Constant voltage is fine. The RS currents are large, but flow only for
    VERY brief periods, a capacitor will hold enough for the pulse.
    Honeywell have some good appnotes abvailable for these devices.

    Paul Burke
     
  5. John

    John Guest

    Is it preferable to excite this bridge by a constant current source or
    a constant voltage source.

    High regards,
    John.
     
  6. Dave VanHorn

    Dave VanHorn Guest

    If it's a wheatstone, then constant voltage.
    I was thinking it was a hall effect device, they are current based.
     
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