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AMR3003LG データシート(PDF) 3 Page - MultiDimension Technology Co.,Ltd.

部品番号 AMR3003LG
部品情報  Dual Axis AMR Magnetic Angle Sensor
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メーカー  MULTIDIMENSION [MultiDimension Technology Co.,Ltd.]
ホームページ  http://www.dowaytech.com/en/
Logo MULTIDIMENSION - MultiDimension Technology Co.,Ltd.

AMR3003LG データシート(HTML) 3 Page - MultiDimension Technology Co.,Ltd.

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03
1. Operating principle
The AMR3003 angle sensors use dual Wheatstone
bridges comprised of eight high sensitivity AMR
sensing elements to increase the sensor’s output
signal amplitude with enhanced temperature
characteristics and anti-interference performance as
shown in Figure 1. The X axis outputs are defined as
Vx+ and Vx-. The X axis output voltage is found by
Vx = (Vx+) - (Vx-). The Y axis outputs are defined as
Vy+ and Vy-. The Y axis output voltage is found by
Vy = (Vy+) - (Vy-). Vx = Asin(2θ) and Vy = Bcos(2θ)
when the magnetic field is at angle θ, where A and B
are constants. The angle θ can thus be determined
through arctangent function.
Vy+
Vy-
VCC
GND
Figure 1. AMR3003 block diagram
By rotating a small magnet placed on top of
AMR3003, a rotating magnetic field parallel to the
surface of the magnetic is generated and is at the
same angle as the magnet. Figure 2 shows the
typical output signals of the AMR3003 in response
to a rotating field. In Figure 2, the rotating magnetic
field is generated by a Helmholtz coil and the supply
voltage is 1V.
As seen in Figure 2, the period of the AMR3003
is 180° and Vx and Vy have a phase shift of 45°.
Figure 2 also illustrates the definition of peak voltage
VPEAK. The output voltage may not be zero at 0°
due the process tolerance, and this VOFFSET can be
calculated by equations 1 and 2. Figure 3 illustrates
the definition of the magnetic field angle.
Vx
Vy
VPEAK
AMR3003
0
Magnetic field Angle (°)
-20
-15
-10
-5
0
5
10
15
20
45
90 135 180 225 270 315 360
VCC = 1V
Figure 2. Typical AMR3003 output curve
θ
θ
Figure 3. Definition of measured magnetic field angle
(top view)
VMAX - VMIN
VPEAK =
Equation (1)
2
VMAX + VMIN
VOFFSET =
Equation (2)
2
MultiDimension Technology Co., Ltd.
http://www.dowaytech.com/en/
AMR3003
Dual Axis AMR Magnetic Angle Sensor


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