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Other Parts Discussed in Thread: EK-TM4C123GXL, DRV5055


Let's suppose that i'm configuring "BOOSTXL-BASSENSORS" with EK-TM4C123GXL.  If i put a magnet very near to the DRV5055A4, doesn't that affect the launchpad ?


  • Dear Mo - 

    No, it should not generally, what is the concern?  

  • Hello Josh,

    I'm Working on a  system that has DRV5055A4 . DRV5055A4 has ±169-mT Range. what would happen if i put a 0.8T magnet near to the sensor?

    Does the DRV5055A4 get its maximum range or that will damage it or even will affect its functionality?

    And if there any sensors can get more range than ±169-mT please mention it. 


  • Dear Mo - 

    The DRV5055 part datasheet indicates that the absolute max flux density that can be applied is unlimited, so it should not be damaged by 0.8T magnet. 

    This part is intended for use as a magnetic field proximity detector / magnetic position sensor (ability to indicate polarity) -  can you describe the magnet shape/size and at what distance /how you want to use it? for best results, the part will need to cut the lines of flux that the magnet produces and the position of each is important as the performance observed will change with respect to that. 

    For example, using a NdFeB grade 52 cylindrical magnet that was 3mm x 32mm (which would be ~1.46T), at a distance of about 10mm, on boresight (perpendicular to the sensor for best results), according to the calculator on the DRV5055 product page, and with the device powered by 3.3VDC, the sensor would see about 7.61mT, at a distance of 1mm, it would see ~324mT and be maxed out, depending on polarity, the output would then be at the Vcc rail or 0V and at 2.75mm separation distance the part would be outputting about half of its possible output range, as it would see about 88mT.

    AFAIK, this is the highest range part we offer. I will loop in/alert someone from this specific product line to comment further or correct me on this. 

    (just so its not confusing to you about my last comment) in this case, for this booster-pack, my team (who covers temp and humidity applications) created this board - and we put the DRV and the OPT parts on there, so it would be handy and full of different sensors. 

  • Mo,

    Thanks for reaching out.  Josh is correct.  The magnetic field of 0.8 T should not damage the device.  In fact, the field the sensor will experience will depend largely on just how close your magnet is placed to the sensor.  Close to the magnet, field strength will decrease proportional to the square of the distance.  So you really wouldn't achieve 0.8 T unless the magnet were right on top of the device (I am assuming this is the field strength at the surface). How your magnet is shaped, placed, and oriented will have an impact on the results you are able to observe.  The sensor only detects the portion of the magnetic field normal to the surface of the package.

    In the case of DRV5055, the largest magnetic field range available is the A4 option when operating at 3.3 V.  This device is capable of sensing up to +/- 176 mT.  This is the highest range currently in our portfolio of linear hall effect sensors.  The calculator on the device landing page should help you approximate what distance you should be able to sense your magnet. Go ahead an input the magnet material and shape.  It should give you estimates of Magnetic flux density based on the distances you enter.

    Please let us know if you need further guidance.

    Thank you,