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TMAG5328: Sense element tolerancing and accurate 3D model

William Weis
Prodigy 10 points
Part Number: TMAG5328


Tool/software:

Hello, 

We are currently performing magnetic simulations in Ansys with the TMAG5328 hall sensors. We found that the 3D model on the TI website for this component is not representative of the actual component. We are trying to find an accurate location for the sense element, but when using the datasheet's location, we found that it does not work out in the given size package of the model. Can you provide an accurate 3D model of this component with a sense element location, along with providing tolerancing of where that sense element can be within the component? The small movements/approximations that we would have to make to use the current 3D model will greatly impact our simulations eventually effecting our final product. 

If we would please get some assistance with this, that would be amazing. 

Thank you

  • 0
    TI__Mastermind 26335 points

    Hello William,

    Thank you for considering to use Texas Instruments.  I suspect the x and y dimensions should have been relative to the outer bounds specified on the package outline drawing in the datasheet, however, I will confirm with my team.  As for the model, I presume you got this through the ultra librarian  found under the "CAD symbols, footprints & 3D models" tab on the TMAG5328 product page.  I think that generation is somewhat automated, however, I will see what can be done about the model.  I will try to provide an update by the end of the day.

  • 0 in reply to Patrick Simmons
    Prodigy 10 points

    Hi Patrick, I did end up getting this through the Ultra librarian found on the TMAG5328 page. Please let me know what can be done about an updated model that references datasheet parameters for where the sense element is located and what the tolerance is on the movement of the sense element in the component. 

    Thank you for your all help! This will be very helpful in our simulations.  

  • 0 in reply to William Weis
    TI__Mastermind 26335 points

    Hey William,

    I am still working through some details with my team regarding this issue.  Sorry for the delay, will try to get you an update later today.

  • 0 in reply to Patrick Simmons
    TI__Mastermind 26335 points

    Hello William,

    The Hall element location figure should have had dimensions relative to the outer edge of the package as we do not provide any specifications for the chamfer or bevel on the edges. The hall dimensions shown are related to the typical dimensions for the package (2.926mmx1.626mmx1.14mm), while the model is based upon the average of the values found on the package outline drawing (2.9mmx1.6mmx1.1mm).  For tolerances on where the hall element is within the package, I need further info from our packaging team.  For a quick approximation I would use 2.9/2.926*(x dimension) and 1.6/1.626*(y dimension).  As the key dimensions for the model coincide within the bounds of the package outline drawing, I do not think we will be able to get a revised model on ultra librarian (at least not soon).

  • 0 in reply to Patrick Simmons
    Prodigy 10 points

    Hi Patrick, Thank you for this information. This will be very helpful when we are running simulations. Please include the Z axis in the tolerancing when that information comes in. 

    Thank you again for all your help. 

  • 0 in reply to Patrick Simmons
    Prodigy 10 points

    Hi Patrick, one more question. Can you also look into how much we expect the sense element to shift with the height of the component? So if we have a range of the height of the component is .55mm, do we expect the sense element to shift that much as well? Or would it be tied to a distance, like the z2 distance? 

     

  • 0 in reply to William Weis
    TI__Mastermind 26335 points

    Hey William,

    Here are the tolerances I was able to get from my team:

    X1: 1.468 ±0.15mm

    X2:  1.458 ±0.15mm

    Y1:  0.9925 ±0.15mm

    Y2:  0.6335 ±0.15mm

    Z1: 0.585mm - 0.715mm

    Z2: 0.385mm - 0.515mm

    There is probably some correlation between package height and z distance however with fixed package height there still might be variation in the relative sensor z dimensions.