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Original question:

[FAQ] I want to use Hall Effect Sensors - where do I start?

DRV5032-SOLAR-EVM: Welcome to the Hall Effect sensor forum!

Guido Annoni di Gussola
Prodigy 30 points
Part Number: DRV5032-SOLAR-EVM
Other Parts Discussed in Thread: DRV5032, DRV5053

Dear Sirs, I receved your DRV5032 Ultra-Low Power, 1.65V to 5.5V Hall Effect Switch Sensor Evaluation Module but I’m not scure if it can be helpfull for me. I need to mesure an magnetic flux emitted by a coil connected to a oscillator source (about 10MHz). Following your suggestion I connect an electronic Volt meter to the out of the DRV5053 and I had :

  1. Placing your magnet (8182) over the 5032 the Volt meter from 2,840Volt drop to 0Volt.
  2. Placing the 5032 over the coil connected to 10MHz the meter was reading the same 2,840V while
  3. Adding your (8182) magnet, over the 5032, the Volt reading was 0,037V. Is that the equivalent 37mTesla ? and is that normal ?
  4. Wy replacing the solar cell with a 5V power the above 0,037V will drop to 10mV ? Is that normal ?
  5. In order to read the real magnetic emitted coil flux I have to add your magnet (8182) over the 5032 ? Is that a normal procedure ?

Thank your for your assistance. Regards. Annoni magband@romandie.com

  • 0
    TI__Genius 17990 points

    Hello Annoni,

    Thank you for using the TI forum.  To answer your questions, the values you were seeing were normal because the DRV5032 is a switch sensor.  This means that the output will only ever be close to VCC or GND based on the strength of the magnetic field around the sensor, as illustrated in the image below.

    If all you want to do is determine whether or not a magnetic field is present, then the switch is all you need.  From your question it sounds like the magnetic field from your coil was not strong enough to trigger the switch.  There are other versions of the DRV5032 that trigger the switch from a smaller magnetic flux that may work for your application. 

    If you need to know the strength of the magnetic flux, then what you need is a linear Hall sensor.  These sensors will give you a varying voltage based on the strength of the magnetic flux around the sensor. You can view our linear Hall options here: http://www.ti.com/sensing-products/magnetic-sensors/hall-effect/analog/products.html.

    If the magnetic flux from your coil is too weak to be measured with our Hall sensors then you may need a Fluxgate sensor, which can be found here: http://www.ti.com/sensing-products/magnetic-sensors/fluxgate/products.html.