Angle Sensor. AAT001-10E Datasheet

AAT001-10E Sensor. Datasheet pdf. Equivalent

Part AAT001-10E
Description TMR Angle Sensor
Feature Data Sheet AAT001-10E TMR Angle Sensor Key Features • Tunneling Magnetoresistance (TMR) Technology •.
Manufacture NVE
Datasheet
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Data Sheet AAT001-10E TMR Angle Sensor Key Features • Tunnel AAT001-10E Datasheet
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AAT001-10E
Data Sheet
AAT001-10E TMR Angle Sensor
Key Features
Tunneling Magnetoresistance (TMR) Technology
Very High Output Signal Without Amplification
Wide Airgap Tolerance
Very High Resistance for Extremely Low Power
Sine and Cosine Outputs Available
Ultraminiature TDFN6 Package
Typical Applications
Rotary Encoders
Automotive Rotary Position Sensors
Motor Shaft Position Sensors
Knob Position Sensors
Description
The AAT001-10E angle sensor is a unique array of four Tunneling Magnetoresistance (TMR) elements
rotated at 90 degree intervals in the package and connected in a bridge configuration. The output can be
configured to represent the sine and cosine functions of the magnetic field applied to the sensor. Each TMR
sensor element has a resistance of approximately 1.25 megaohms. Outputs are proportional to the supply
voltage and peak-to-peak output voltages are much larger than other sensor technologies. The part is
packaged in NVE’s 2.5 mm x 2.5 mm x 0.8 mm TDFN6 surface mount package.
Operation
Each sensor elements contain two magnetic layers: a “pinned,” or fixed direction layer; and a movable-
direction, or “free” layer. The diagram below illustrates the configuration, using arrows to represent the two
layers:
Angle between Pinned
and Free layers
determines sensor
resistance
Free layer aligns
with Applied
Magnetic Field
NVE Corporation • 11409 Valley View Road, Eden Prairie, MN 55344-3617 • (952) 829-9217 • www.nve.com



AAT001-10E
AAT001-10E TMR Sensor
An external magnet provides a saturating magnetic field (30 to 200 Oe) in the plane of the sensor, as
illustrated below for a bar magnet and a split-pole magnet:
The sensor element free layers will align with the external field. As the applied field changes direction, the
angle between the free layer and the pinned layer changes, changing the resistance of TMR elements, which
changes the device output voltages.
Variations in the air gap between the magnet and the sensor element will cause slight changes in the output
depending on the size and strength of the external magnet. The following chart shows a typical sensor output
versus the angle of applied field using a 12 mm diameter, 4 mm thick split-pole ferrite magnet and a 5 V
supply with three different air gaps:
Angle Sensor Output with Variations in Airgap, 5V Supply
2.9
Cosine, 3mm
2.8 Sine, 3mm
Cosine, 4mm
2.7 Sine, 4mm
2.6 Cosine, 5mm
Sine, 5mm
2.5
2.4
2.3
2.2
2.1
2
0 24 48 72 96 120 144 168 192 216 240 264 288 312 336 360
Degrees of Rotation
NVE Corporation • 11409 Valley View Road, Eden Prairie, MN 55344-3617 • (952) 829-9217 • www.nve.com





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