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DRV425: Suitability for electronic compass applications

Chris Conrad1
Prodigy 50 points
Part Number: DRV425

Is there any information on this part on the cross-axis sensitivity and on the tolerance of the direction of the axis of sensitivity?  Any information you can provide would be very helpful!

  • 0
    TI__Mastermind 32210 points

    Chris,

    The number is very good but the issue come with the angle of the die placed in the die.  It can vary a couple of degrees. The largest error is due to placement variation. Let me know if this is clear.

  • 0 in reply to Javier Contreras4
    Prodigy 50 points

    Javier,

    A couple degrees is a helpful answer.  This can be addressed with a factory calibration when higher accuracy is needed.

    Any thoughts on the cross-axis sensitivity?    

    And on a related question, DRV425 to DVR425 susceptibility... we would be using two or three sensors in an orthogonal configuration.  Any recommendation for minimum separation distance, or is this not a concern?

  • 0 in reply to Chris Conrad1
    TI__Mastermind 32210 points

    Chris,

    Unfortunately.  I cannot get you an exact number as the cross-axis sensitivity.  I had some data collected from someone and there are two issues.  I cannot find the data and this was before we knew about the placement of the sensor in the QFN package variation.

    I have seen the placement of multiple sensor next to each other and did not see any issues as they were making delta measurements.  The angle issue I mentioned did come up in that situation.  They were place under 1mm space between them but all facing the same direction. 

    Please be aware that components next to the devices should not contain magnetic material.  So bypass capacitors and the Rshunt should be non-magnetic.  Depending on the levels of field you are measuring the PCB traces will provide current that can produce a field and you should worry about that proximity or routing methods.  Normally the currents are small enough and the proximity far enough away to make any impact.