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Kind: captions
Language: en

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♪ What direction?

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Today we’re demonstrating NVE’s

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revolutionary omnidirectional magnetic sensors.

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Most magnetoresistive sensors are sensitive 
in-plane, while Hall effect sensors are  

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sensitive perpendicular to the IC plane.

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Omnidirectional sensors are sensitive in both directions
and anything in-between.

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Let’s look at a Hall sensor first.

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This sensor is not omnipolar, so the 
output is centered around half the supply.

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It’s not very sensitive in 
the in-plane direction. 

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In its sensitive direction, it 
saturates at about 4.5 volts.

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The output is different 
depending on the polarity.

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It’s saturated at about half a volt.

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Now the NVE sensor, which is on a new breakout board.

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It’s sensitive in-plane. 

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Polarity doesn’t matter.

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It’s also sensitive perpendicular like a Hall effect.

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It’s almost impossible to saturate—

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it operates to well over a tesla, which is 
250 millivolts with a five-volt supply.
 
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Let’s look at this omnidirectional 
feature in detail.

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We mounted a magnet to a rotary table.

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You can see the output remains relatively constant
as the magnet is rotated.

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So how is this magic possible?

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In-plane, the lower layer in 
the TMR stack—represented in green—

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rotates to align with the B-field,  
and the resistance drops as the field increases.

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But NVE’s revolutionary Omni-TMR technology is 
sensitive to magnetic fields in any direction.

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When a perpendicular magnetic field is 
applied to the TMR, 

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the upper layer of the stack rotates 
from an in-plane orientation at low fields

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to a perpendicular direction at high fields

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and the resistance drops.

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This unique dual sensing layer TMR structure

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allows a single sensor to detect 
magnetic fields in any direction.

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NVE arranges these TMR elements into 
a Wheatstone bridge to form a sensor

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like the omnidirectional AKT001 analog sensor
we demonstrated,

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and AHK- and ADK991 magnetic switches.

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So we’ve seen that these sensors have are 
omnidirectional and omnipolar, 

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have an ultra-wide field range, 

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and are virtually impossible to saturate.

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They come in an ultraminiature package

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and are very low power.

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Contact NVE or visit nve.com
to buy sensors or breakout boards.

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Like and subscribe for more demonstrations.