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DRV5032: DRV5032

user3653238
Prodigy 10 points
Part Number: DRV5032

I have an application where I will have a layered series of DRV5032's and magnets stacked over each other in a tower formation and spaced.  Each DRV5032 and magnet pair will indicate to the system if there is another module above it.   I do not want other magnets outside the link (above and below) to have an effect.  Should I consider a unipolar switch and is there a tool that can help me make the calculations for magnetic strength and spacing?

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    TI__Mastermind 26505 points

    Hello,

    Thank you for using the TI forum.  It sounds like you only need to sense one pole of the magnet, so using a unipolar switch could help you avoid accidentally tripping the switch from a magnetic field in the opposite direction.  However, stray magnetic field of the same direction could still trip the switch (a south pole from above is the same as a north pole from below).  The DRV5032DU and DRV5032FD have unipolar options.  Since these devices (in the X2SON package) have the option to be unipolar to either north or south poles, you could alternate rows so that if one row is sensitive to south poles from above, the row below it could be sensitive to north poles from above.  That way the magnet underneath the sensor is facing the wrong way to trip the sensor above it. (unless I misunderstand your setup and you want those to trip, then each sensor can just be sensitive to the same field direction).

    The DRV5032 product page (http://www.ti.com/product/DRV5032) has a really convenient calculator tool that can show you the max Bop and the min Brp tripping distance for you specific magnet.  The tool looks like this: