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AMR sensor angular ZMT320 pages
ZMT32
Magnetic Field Angle Sensor
Description
The ZMT32 is a thin film permalloy magnetic
field sensor, which contains two galvanic
isolated Wheatstone Bridges for high
precision angle measurement applications
under low field conditions. This angle sensor
is based on the anisotropic magnetoresistive
effect (AMR). The two internal (VCC1, VCC2)
bridges enclose a relative sensitive angle of
45 degrees. The input field is a rotating
magnetic field in the chip plane (parallel to
the surface of package). This rotating field will
make available two independent sinusoidal
output signals with the following relationship
The precise ZMT32 works with low field
applications (Hrot= 8 to 25kA/m), much lower
than similar devices. The ultimate output signal
quality depends on the external magnetic
material and on the mechanical realization.
The ZMT32 is a passive part and the ArcTangent interpolation needs external signal
processing. Typical areas of application are
angle and speed measurement.
VO 2 Sin(2α )
=
= Tan(2α )
VO1 Cos (2α )
where α = angle between sensor axis and field
direction
Features
Applications
•
contactless angle measurement up to 180°
•
angle and angular velocity measuring systems
•
flexible measuring solutions for moved
systems
•
absolute angle and angle change
•
•
stable operation over long time
automotive electronic (steering,
control, pedal positioning, etc
•
high temperature range up to +160°C
•
contactless rotary switches and potentiometer
•
automatic adjustment
-VO1(cos)
1
8
GND (bridge 1)
-VO2 (sin)
2
7
GND2 (bridge 2)
VCC2(bridge 2)
3
6
+VO2 (sin)
VCC1 (bridge 1)
4
5
throttle
+VO1 (cos)
Ordering Information
Device
Reel size
(Inches)
Tape width
(mm)
Quantity
per reel
Device
marking
ZMT32TA
7
12
1,000
ZETEX
ZMT32
Issue 1 - June 2008
© Zetex Semiconductors plc 2008
1
www.zetex.com
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