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gear tooth sensor ICs by DRV5023

Other Parts Discussed in Thread: DRV5023, DRV5053, DRV5033, DRV5013

Dear sir, I am going to design a gear tooth detector like picture below, and tend to use DRV5023 +14.5 / +6 mT (BI)  to implement this function.  Is this workable ? or is this right part for this applicaton?  please give me some suggestion. Thanks.

  • Hi Eason,

    Our expert has been notified and should reply soon.
  • Yes, this is a reasonable application. The field that the sensor sees depends on multiple factors. I suggest getting both versions of the DRV5023, in case one sensitivity works better.

    Best regards,
    RE
  • Dears,

    Thanks for your kindly help. To be honest, I have tested below both parts  but It seems doesn't work . I still can not  got  the gear waveform in the output . I wonder if there is something wrong.  Could you please give me some suggestion? Thanks.

    DRV5023BIQLPGM  
    DRV5023AJQLPGM  

     

  • Have you tried orienting the magnet in both ways, with the North and South pole facing the device?  Also, maybe you can try different separation distances between the magnet and sensor, and sensor and gear.  Also, do you have just a solid piece of metal you can experiment with?  You could also try using the DRV5053 and seeing the change in analog voltage, since that provides more information than the digital switch.

    Best regards,
    RE

  • Dear RE,

    I have tried many ways like you mentioned.
    Please allow me to explain our experiment below:

    1.using competitor gear tooth Hall sensor module(unknow brand)
    like above application picture, firstly we measure vout 12v, then tie magnet to the buttom side of the hall sensor IC, and we can get vout 12v , then we approach the gear thooth , we got vout 0v. (correct function)

    2. using DRV5023A or B (even DRV5013 , DRV5053 and DRV5033) replace competitor
    we measure vout 12v, then tie magnet to the buttom side of the hall sensor IC, we get vout 0v (DRV5053 vout 0.63V), we approach the gear tooth , vout still 0V (DRV5053 vout 0.63V)
    I wonder if this is suitable for gear tooth sensor.


    by the way, I have tired orienting the magnet in both side, or the North and South pole facing the device. Also the distances between the gear tooth and sensor IC.

    please kindly give me some suggestion, Thanks.
  • So do you see a change in the DRV5053 voltage based on the presence of the gear tooth?

    I suspect the digital versions aren't toggling because the metal gear doesn't cause the magnetic field to change sufficiently at the sensor.  The most reliable way to see the change is likely with the DRV5053.

    Best regards,
    RE

  • Dear Re,
    No , I didn't see a change in the DRV5053 voltage.
    I found ATS616LSG can work, but I am not sure what is the different between DRV5023 & ATS616LSG, Thanks.

    datasheet.eeworld.com.cn/.../39012_ATS616LSG.pdf
  • I've tested the DRV5053 using a back-biased magnet, and observed a change in voltage with a metal object present on the other side.  It's small, and it depends on several factors including the distance of the magnet, the size of the metal, and the DRV5053 version.  It sounds like it's not working well for your application.  If the DRV5053 isn't changing in voltage, the digital versions definitely won't switch.

    Best regards,
    RE