• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 364 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.

DRV5056: DRV5056-A1

Bhaktprakash Patel
Prodigy 70 points
Part Number: DRV5056
Other Parts Discussed in Thread: TMAG5273

Hello

 

 I am planning to use a DRV5056-A1 Hall sensor. The range of magnetic fields I will be detecting is North and South polarities in the 2-4mT range. Small magnets for a small product. 

I considered using the DVR5055, bi-polar detector, these have 100mV per mT @5V sensitivity and are impossible to find these parts.  Due to the low magnetic fields, I am decided to use the DRV5056, uni-polar, 200mV per mT @5V sensitivity  

Questions

  1.  See attached image. Can the DRV5056 be used to detect low magnetic fields? as shown by the "Operating Region"? Even North fields? 
  2. See attached scope image (yellow trace) - this shows the actual output from the Hall sensor, where N and S magnetic fields are detectable. I just want to make sure its within the parts capability to detect a North field. If so where is it stated in the data sheet? I want to make sure I can get this response from the Hall sensor once we are in production. 
  3. Considering I am detecting low magnetic fields, can you suggest another high sensitivity part? in a SOT23 package? 

 

Thanks

  • 0
    TI__Mastermind 21120 points

    Thanks for reaching out with your question.  As you've shown, there is some range where DRV5056 is able to respond to a N field given that the Quiescent output voltage is at about 600 mV.  However, driving the input with this input forces the device into the "claw" portion of the output curve, so the results may not have the same linearity as the normal operating region.  It would be difficult to quantify how repeatable your measurements will be for this area of operation. So while the device is responding to these inputs, the sensitivity parameter may not fall within specification.

    There are a couple different options. DRV5053VA has a sensitivity of -93mV/mT and is offered in a 3 pin SOT-23. TMAG5273 is offered in a 6 pin SOT23 and operates over I2C.  This device has a minimum programmable input range of +/- 40 mT.  

    Thank you,

    Scott

  • 0 in reply to Scott Bryson
    Prodigy 70 points

    Thanks Scott.

    Our simulation team was asking what is the size of the Hall Sensor (HS) die? They want to be able to simulate the amount of flux they anticipate on reaching the HS in our application.

    Thanks

       

  • 0 in reply to Bhaktprakash Patel
    TI__Expert 7495 points

    Hi Bhaktprakash,

    The below picture shows the location of the sensing element:

    We are not able to provide information on the size of the sensing element, so your simulation team would just need to model the sensing element as a point.  

    Regards,

    Mekre