Data Sheet
N
VE Corporation • 11409 Valley View Road, Eden Prairie, MN 55344-3617 • (952) 829-9217 • www.nve.com
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 for Direction Detection
• Ultraminiature TDFN6 Package
Typical Applications
• Rotary Encoders
• Batttery-Powered Rotary Position Sensors
• Motor Shaft Position Sensors
Description
The AAT001-10E angle sensor is a low power, high output magnetic sensor element able to provide
rotational position measurements when a rotating magnetic field is applied to the sensor. Sine and cosine
signals are available for a quadrature output.
The sensor element has a resistance of approximately 1.25 M and can be operated at typical battery
voltages to conserve power. 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 of the four sensor elements contains 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 magnetic orientation of the layers:
Free Layer
Applied Magnetic Field
(30 to 200 Oe)
Free layer aligns
with applied
magnetic field
Pinned Layer
Angle between
pinned and free
layers determines
sensor resistance
AAT001-10E TMR Sensor
N
VE Corporation • 11409 Valley View Road, Eden Prairie, MN 55344-3617 • (952) 829-9217 • www.nve.com
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 elem ent 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 A irga p, 5V Supply
2
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
0 24 48 72 96 120 144 168 192 216 240 264 288 312 336 360
Degr ee s of Rot a tion
Voltage
Cos ine, 3m m
Sine, 3mm
Cos ine, 4m m
Sine, 4mm
Cos ine, 5m m
Sine, 5mm
AAT001-10E TMR Sensor
N
VE Corporation • 11409 Valley View Road, Eden Prairie, MN 55344-3617 • (952) 829-9217 • www.nve.com
Functional Block Diagram, Marking, and Pinout
The AAT001-10E package is marked “FCVe.” The device contains four sensing resistors with the pinned
layer 90 degrees apart. The resistors are connected as two half-bridges, providing sine and cosine outputs:
FCVe
R1 (Sine)
Vcc
Cos
GND
Sin
Cosine Output Sine Output
Vcc
GND
R2 (Sine)
R4 (Cosine)
R3 (Cosine)
Operating Specifications
Parameter Test Condition Min. Typ. Max. Units
Resistance (Each Resistor)6 25°C 0.6 1.25 2.5 M
Peak-to-Peak Signal Level Operating at 25°C 130 160 180 mV/V
Required Applied Magnetic Field Strength Operating 30 200 Oe2
Angular Measurement Error, Variable Bias3 Operating 3 Angular Degrees
Angular Measurement Error, Fixed Bias4 Operating 0.5 Angular Degrees
Supply Voltage Operating 5.5 V
Offset Voltage Operating at 25°C 10 10 mV/V
Temperature Range of Operation Operating 40 125 °C
Temperature Coefficient of Resistance Operating 0.13 %/°C
TCOV5 Operating 0.16 %/°C
Absolute Maximum Ratings
Parameter Min. Typ. Max. Units
Supply Voltage 7 Volts
Sto rage Temperature 40 170 °C
ESD (Human B ody M odel) 2,000 Volts
Applied Magnetic Field1 Unlimited Oe
Notes:
1. Large magnetic fields CANNOT damage NVE sensors.
2. 1 Oe (Oersted) = 1 Gauss in air = 0.1 millitesla = 79.8 A/m.
3. Variable Bias means the magnetic field strength at the sensor can vary across the specification range; this is the same as a variable airgap between the
bias magnet and the sensor.
4. Fixed Bias means the magnetic field strength at the sensor is constant; this is the same as a fixed airgap between the bias magnet and the sensor.
5. TCOV is the percent change in voltage signal over tem perature with a constant supply voltage.
6. Resistance is specified with the saturating magnetic field applied.
AAT001-10E TMR Sensor
N
VE Corporation • 11409 Valley View Road, Eden Prairie, MN 55344-3617 • (952) 829-9217 • www.nve.com
Package Drawing – TDFN6 2.5 mm x 2.5 mm
Notes:
• Dimensions in mm.
• The center pad may be left floating or connected to ground.
©NVE Corporation
All rights are reserved. Reprodu ction in whole or in part is prohibited without the prior written consent of the copyright owner.
SB-00-024 August 4, 2012
RoHS
COMPLIANT
AAT001-10E TMR Sensor
N
VE Corporation • 11409 Valley View Road, Eden Prairie, MN 55344-3617 • (952) 829-9217 • www.nve.com
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Applications
Applications described in this datasheet are illustrative only. NVE makes no representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
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Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) will cause permanent damage to the
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operating conditions of the datasheet is not warranted. Constant or repeated exposure to limiting values will permanently and irreversibly affect the
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