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DRV5032: Magnet below IC

May
Genius 9880 points
Part Number: DRV5032

Hi Team,

Just want to confirm, what happens if the magnet is below the package? Would it be sensitive in the same manner?

What is the consideration when implementing below the PCB/IC?

Thank you.

Regards,
May

  • 0
    TI__Genius 9880 points

    Hi Team,

    Additional question,

    "The device is only sensitive to the field component that is travelling orthogonal to the face of the package. Since it is omnipolar, it does not matter if that is from top to bottom (negative), or bottom to top (positive)." 

    e2e.ti.com/.../drv5032-magnetic-orientations-to-trigger-switch-at-some-distance

    It seems that it does not matter whether the magnet approaches the package from the top or from the bottom as shown in the image attached. Can you please confirm this?

    Regards,
    May

  • +1 in reply to May
    TI__Genius 15290 points

    May,

    Thanks for reaching out on E2E for clarification.  The image you copied from the datasheet is demonstrating the directionality of the B-field vector.  In the case where the S pole is presented to the sensor from above, the vector is directed upward.  If this same magnet orientation was kept but the magnet was presented from below (N pole closest to magnet) then the same would be true.

    The right-hand side of the image portrays the N pole presented from above, which yields a downward direction in the B-field vector.  In this case, this would produce a negatively triggered output on DRV5032.

    There should be no issue in the case of the magnet approaching from the bottom of the PCB.  Magnetic fields permeate through materials typically used in PCB manufacture and should therefore yield no observable effect on your sensor.

    For the omni-polar sensor options of DRV5032, it will not matter how the magnet is oriented as long as the input field exceeds BOP Max for the triggered state and returns below BRP Min for the inactive state.  DRV5032 is offered with two variants which are unipolar.  These devices (DRV5032DU and DRV5032FD) each have two outputs.  One is sensitive to a positive field and one is sensitive to the negative field.  In these cases it is important to keep in mind the proper magnet orientation to maintain proper functionality for each output case.

    Thanks,

    Scott