Diodes ZMT32 User Manual
Zmt32 magnetic field angle sensor, Description ordering information, Features
© Zetex Semiconductors plc 2008
ZMT32
Magnetic Field Angle Sensor
Description
Ordering Information
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 (V
CC1
, V
CC2
)
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
where
α = angle between sensor axis and field
direction
The precise ZMT32 works with low field
applications (H
rot
= 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 Arc-
Tangent interpolation needs external signal
processing. Typical areas of application are
angle and speed measurement.
Features
•
contactless angle measurement up to 180°
•
flexible measuring solutions for moved
systems
•
stable operation over long time
•
high temperature range up to +160°C
Applications
•
angle and angular velocity measuring systems
•
absolute angle and angle change
•
automotive electronic (steering, throttle
control, pedal positioning, etc
•
contactless rotary switches and potentiometer
•
automatic adjustment
Device
Reel size
(Inches)
Tape width
(mm)
Quantity
per reel
Device
marking
ZMT32TA
7
12
1,000
ZETEX
ZMT32
( )
( )
( )
α
α
α
2
2
2
1
2
Tan
Cos
Sin
V
V
O
O
=
=
-V
O1
(cos)
-V
O2
(sin)
V
CC2
(bridge 2)
V
CC1
(bridge 1)
+V
O1
(cos)
+V
O2
(sin)
GND2 (bridge 2)
GND (bridge 1)
2
3
4
5
6
7
8
1