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DRV5055: Location tolerances with respect to magnet center.

Prodigy 20 points

Replies: 3

Views: 44

Part Number: DRV5055

Hi, 

What are the required location tolerances ( x,Y) from the center of magnet, for this sensor to work on a PCB board?

  • Hello Vandana,

    Thank you for using the TI forum.  

    Since the DRV5055 is a linear Hall effect sensor (outputs a varying voltage based on the strength of the magnetic field), the location tolerances depend significantly on your system design, accuracy requirements, and the magnet shape/size itself. Essentially, when the magnet is misaligned from your expected position, the output voltage will be a little different than the expected value. This will cause an accuracy error in your system, which may or may not be ok, based on your requirements.  

    If your accuracy requirements are higher then your mechanical tolerances, it is often possible to calibrate the output voltage to the mechanical position to improve accuracy.

    Best Regards,

    Mitch M, TI Sensing Products Applications Support

    Getting Started with Current Sensing Video Training Series

    Hall Effect Sensor Video Training Series

    TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs. All information in this correspondence and in any related correspondence is provided "as is"  and is subject to TI's Important notice and disclaimer.

  • In reply to Mitch M:

    Hi Mitch,

    Thank you for the reply. Do you have any study done, how the Mechanical position in X, Y Vs % of Voltage change?.

    Vandy 

  • In reply to Vandana Vavilikolane:

    Hello Vandy,

    We do not have a specific study done because it changes so much based on the setup/magnet. I recommend using a magnetic calculator or simulation tool to see how the magnetic field would change based on your specific system.  Then, once you know the change in magnetic field, you can determine the change in the output of the device. 

    Here is a link to a fairly simple free magnetic field calculator: https://www.kjmagnetics.com/fieldcalculator.asp 

    Note that with this calculator, you'll want to look only at the value of Bx or By based on the direction you are sensing in, not the total magnetic field labeled "Magnetic Field Strength"

    If you need more than a simple calculator, you can use the free 2D simulation tool FEMM, found here:  http://www.femm.info/wiki/HomePage 

    Best Regards,

    Mitch M, TI Sensing Products Applications Support

    Getting Started with Current Sensing Video Training Series

    Hall Effect Sensor Video Training Series

    TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs. All information in this correspondence and in any related correspondence is provided "as is"  and is subject to TI's Important notice and disclaimer.

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