DRV5055: Minimize actual detecting area

Hi Maynard,

Can you provide more info on the magnet used here? 

Also, just to confirm, can you elaborate on what you mean by the active area dimension of the DRV5055?  Are you referring to the sensing area of the device, or are you referring to anything specific to the actual field?

Regards,

Mekre

Hello Mr. Mesganaw,

I am the customer Mr. Yago referred to.

About the magnet, we have a linear magnetic material.

Along the material, the polarity of the magnetic field is N-S-N-S-N...

So from above, we should detect a sine wave form of magnetic field.

At the wave peak, let's say it's at the middle of the N polarity. At the valley, it's the middle of S.

As for the sensing area.

I would like to sense at a specific single point along the linear magnetic material.

I hope the actual sensing area/district of the device is as small as possible, so that the signal won't be disturbed or averaged out by nearby magnetic field.

So the interest is the actual detecting/sensing area/district/range/dimension of the DRV5055 device.

Hi Mr. Chen,

Can you draw a diagram that shows the system? Also, are you calculating the angle or distance in this application?

Thank you,

Mekre

Hello Mr. Mesganaw,

Here is a diagram just like our system: 

https://www.researchgate.net/publication/326418583/figure/fig3/AS:649018484989960@1531749473380/The-setup-of-a-linear-encoder-A-read-head-with-xMR-sensor-moves-along-the-x-axis-above.png

Unlike the diagram, we use hall sensor instead of MR sensor.

And similar to the diagram, our gaps between S and N polarities are 1mm.

So we'd like the measure unit to be as small as possible, better as small as 20 micrometer.

As for the direction, we'd like to ask for both single-axis hall sensor and three-axis hall sensor.

Thank you so much!

Ching Hung

Hi Mr. Chen,

Can you also tell me the distance from the magnetic belt to the sensor?  Additionally, what is the strength/grade of the magnetic material?

Regards,

Mekre

Hello Mr. Mesganaw, 

The distance would be 0.1mm~1.5mm

The strength is within 1000 Gauss.

Appreciate!

Best regards,

Ching Hung

Hi Mr. Chen,

Thank you for this info.  With this info, I will check internally with the team on the active area and get back to you with the next update either tomorrow or Monday.

Regards,

Mekre