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DRV5053: Please suggest a Hall Sensor to detect Magnetic Field strength of 1.2T and above

manoj sai
Expert 2305 points
Part Number: DRV5053
Other Parts Discussed in Thread: DRV5056, DRV5057, DRV5055

Hi All,

I am unable to detect Magnetic field strength above 1.2T. Presently I am using DRV5053VA Hall Sensor. Hall Sensor(DRV5053) is getting saturated and we are getting 2V output i.e. with just for one single magnet. But we want to detect stacked magnet's presence. I mean we want to detect 4 magnets presence in the proximity of the hall sensor.

Presently with one single magnet, Hall sensor is getting saturated. So it not detecting two or more magnets i.e. when 4 magnets are stacked together.

kindly suggest a method or a HallSensorPartNumber to solve our problem.

Thanks in advance.

  • 0
    TI__Mastermind 26105 points

    Hello Manoj,

    Thank you for using the TI forum.  I have a couple suggestions for you to help you meet your sensing requirements.

    The VA version of the DRV5053 is the highest gain version of the DRV5053, which will give you the smallest magnetic sensing range.  To increase your sensing range, you want to switch to the lowest gain version.  For the DRV5053, this would be the DRV5053OA.  Also if you would like a more accurate sensor, you could switch to one of our second generation linear Hall devices (DRV5055, DRV5056, DRV5057).  If you use one of these newer devices, you would want to use the A4 version (ie, DRV5055A4 for bidirectional, DRV5056A4 for unidirectional, or DRV5057A4 for bidirectional with PWM output).

    The above sensor suggestions will increase your magnetic sensing range, but cannot measure 1.2T directly.  There are a few ways around this, based on your system design and requirements here are a few ideas that can help:

    • Move the sensors farther away from the magnets, if possible.  
      • The farther the sensors from the magnets, the weaker the magnetic field. Doing this can hopefully bring the magnetic field into a better sensing range.
    • Change the angle of the Hall effect sensors.
      • The linear Hall effect sensors only detect magnetic field in one direction (perpendicular to the face of the sensor package. Because of this, it is often possible to re-position the sensor to only detect part of the magnetic field. 
        • For example, if you are using the TO-92 package, if the senor is facing the magnetic field head on, then the magnetic field seen at the sensor will be maximized.  If the sensor is rotated 90° then there will be virtually no magnetic field seen at the sensor, but if the sensor is rotated 45° then the sensor will see approximately 50% of the magnetic field.
        • The numbers above are with one direction of magnetization, when adding or moving magnets the primary direction changes, so this method can be challenging to predict or calculate, but can be very effective.
    • Add shielding between the magnets and the sensors.
      • If possible in the system, a metal shield can be used in between the sensors and the magnet to reduce the magnetic field seen at the sensors.