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PDF ZMT32 Data sheet ( Hoja de datos )
| Número de pieza | ZMT32 | |
| Descripción | Magnetic Field Angle Sensor | |
| Fabricantes | Zetex Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ZMT32 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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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
VO 2
VO1
=
Sin(2α )
Cos(2α )
= Tan(2α )
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 Arc-
Tangent interpolation needs external signal
processing. Typical areas of application are
angle and speed measurement.
where α = angle between sensor axis and field
direction
Features
Applications
• contactless angle measurement up to 180°
• flexible measuring solutions for moved
systems
• stable operation over long time
• high temperature range up to +160°C
• 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
-V (cos) 1
O1
-VO2 (sin) 2
VCC2(bridge 2) 3
VCC1 (bridge 1) 4
8 GND (bridge 1)
7 GND2 (bridge 2)
6 +VO2 (sin)
5 +VO1 (cos)
Ordering Information
Device
Reel size
w w w . D a t a S h e e t 4 U . c o m (Inches)
ZMT32TA
7
Tape width
(mm)
12
Quantity
per reel
1,000
Device
marking
ZETEX
ZMT32
Issue 1 - June 2008
© Zetex Semiconductors plc 2008
1
www.zetex.com
1 page  
Operating principle
ZMT32
H
0O rot
1
GND1
8
GND2
7
+VO2
6
+VO1
5
α = 0°
␣
Bridge
1
Bridge
2
1
-VO1
2
-VO2
3
VCC2
4
VCC1
-V
O1
-VO2
Vcc2
Vcc1
1
GND1
GND2
+V
O2
+VO1
Characteristic output curves VO1, VO2
10
5
When a common-magnetic field is applied through the
ZMT32 the 2 internal magneto-resistive bridges are
affected slightly differently due to their 45° rotation to
one another. This 45° rotation enables the ZMT32 to
determine angular position, of a rotating magnetic
field.
When a rotating magnetic field is applied to the ZMT32
it will output 2 sinusoidal voltages that are:
• proportional to the field strength applied
• proportional to the supply voltage applied,
• rotating at twice the angular position
• 90° apart (as seen below).
By taking the arcTan of the ratio of VO2 to VO1 the
angular position of the magnetic field can be
determined.
Cos 2α
0 Sin 2α
-5
-10
Sensor bridge 2
www.DataSheet4U.com-15
Sensor bridge 1
0 45 90 135 180 225 270 315 360
Issue 1 - June 2008
© Zetex Semiconductors plc 2008
5
www.zetex.com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ZMT32.PDF ] | |
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