• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 30 subscribers
  • Views 225 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV5011: Possible to use a geartooth sensor with backbias magnet?

Gleb Shenkerman
Prodigy 15 points
Part Number: DRV5011
Other Parts Discussed in Thread: DRV5013, , TMAG5233, TMAG5328

Tool/software:

Dear TI support team, 

I am an electronic engineer for Noris Automation in Nuremberg and since I am working for roughly for two years I do not have that much professional experience. 
Noris Automation is producing hall effect based speed sensors and other automation solutions. 

I would like to know before I order a few samples of the IC interesting us:
Is it basically possible to use the DRV5011 or the DRV5013 in the TO92-3 package as a hall effect geartooth sensor with a 1000 mT back bias magnet? 


The reason I am asking is one of our key hall elements we have been using was discontinued by the end of 2024 and we are now looking for a replacement. 
What interested us in this IC was the very low current consumption and the high frequency bandwith as well as the temperature range from -40 °C to +135 °C. 

Best regards, 

Gleb Shenkerman

  • 0
    TI__Mastermind 21710 points

    Gleb,

    Thanks for reaching out.  I think to attempt a back-biased gear sensing it would be better to select a Hall-effect switch.  I am doubtful we would get the alternating magnetic polarities needed to toggle a latch type device like DRV5011.  

    The challenge with setting up a gear tooth sensor will be that back bias magnetic field needs to be just below BRP Min, but the presence of the gear tooth needs to draw enough of the field to exceed BOP Max.  Since the range between BOP and BRP must be exceeded for reliable switching, this will likely be easiest with a high sensitivity device which offers low thresholds and minimum hysteresis.  You might consider DRV5032FA, TMAG5231A, or TMAG5233. 

    Additionally TMAG5328 might help you here as well.  This device allows you to configure the BOP with a predetermined hysteresis based on the variant selected.  You may find that you can tune the sensor to the configuration to achieve your goal.  This might actually be the easiest option.

    The particular challenge is ensuring that the gear tooth causes adequate deflection of the magnetic field.  These devices weren't designed specifically for this function, so it would likely require some finesse with exact placement of a magnet relative to the sensor and gear to get the desired effect.  I haven't attempted this configuration using a 1D switch device, but we have seen it work in application using a 3D Linear sensor with programmable threshold.

    https://www.ti.com/lit/an/sbaa632/sbaa632.pdf?ts=1747406790689&ref_url=https%253A%252F%252Fwww.google.com%252F

    Thanks,

    Scott