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PDF ZMX40M Data sheet ( Hoja de datos )
| Número de pieza | ZMX40M | |
| Descripción | DUAL MAGNETIC FIELD SENSOR | |
| Fabricantes | Zetex Semiconductors | |
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Hay una vista previa y un enlace de descarga de ZMX40M (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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DUAL MAGNETIC FIELD SENSOR
ZMX40M
DESCRIPTION
This device is a special tangential field difference
sensor with two AMR (Anisotropic Magneto-Resistive)
bridges for field movement measurements or field
comparative measurements.
The ZMX40M contains two extremely sensitive magnetic
sensor chips, mounted parallel to each other in an SM8
package, employing the magneto-resistive effect of thin
film permalloy. It allows the measurement of magnetic
fields or the detection of magnetic parts. The sensors each
consist of a chip covered with thin film permalloy stripes
which form a Wheatstone bridge, whose output voltage is
proportional to the magnetic field component Hy. A field
Hx, which is perpendicular to Hy, is necessary to suppress
the hysteresis and to bias the sensors into the linear
region. This field Hx is provided by an internal permanent
magnet.
The chips are mounted in the package 3mm apart. If a
magnet travels horizontally above the sensor, each chip
will give an output which will peak as the magnet passes
above it and the two peaks will be spatially separated by
3mm.
FEATURES
• Output voltage proportional to magnetic field Hy
across each chip
• Both chips are in the same orientation and chip
centres are 3mm apart in Y direction
• Magnetic fields vertical to the chip level Hz are not
effective
• Disturbing fields Hx up to 30 kA/m are allowed
• Extremely small chip distance from the top side of
package for accurate measurement
When the two peaks are the same amplitude, the magnet
must be mid-way between the two chips. Therefore this
double sensor can be used to measure position of, for
example, a wheel tooth very accurately for automotive
and machine-tool applications. With calibration to allow
for the tolerances on the bridge outputs being slightly
different, the ZMX40M has been used in machine tool
applications to resolve distances down to 30µm. By
comparing the two outputs and adding some hysteresis,
a large-geometry magnetic tape reader (for example for a
magnetic tape ruler) can be made. By combining both
bridge outputs a current sensor can be also made by
adding an external current loop over or under the
ZMX40M. This loop is outside the package and therefore
provides excellent galvanic isolation.
APPLICATIONS
• Linear position measurement for process control,
door interlocks, proximity detectors and precision
machine tools
• H-field movement measurement for a magnetic
tape recognition
• High voltage isolated current measurement up to
many amps range by using a suitable current loop
over or under the IC
• Detection of rotating magnets in the presence of a
disturbing field by comparisons of maximum
values of individual sensors
• Internal magnet each chip for creation of auxiliary
field Hx
PINOUT
DEVICE MARKING
• ZMX40M
CONNECTION DIAGRAM
AMR chip 1: supply voltage between +Vb1 and -Vb1
output voltage of bridge between
+Vout1 and -Vout1
AMR chip 2: supply voltage between +Vb2 and
-Vb2 output voltage of bridge between
+Vout2 and -Vout2
Top View
ISSUE 2 - JUNE 2005
1
SEMICONDUCTORS
1 page  
ZMX40M
*2 According to the application two different forms can be used.
a.) magnetic strips for length measuring systems of short distances up to approximately 100mm
[flexible plastic material filled with magnetic north-south-parts in a defined raster , for example thickness 1,5mm and width 5mm and magnet
pole length 2mm with transverse unilateral magnetization , separably from magnetized foils of the company Max Baermann GmbH ,
contact address Sales & Applications, Mr. Nass : email [email protected] and phone (+49) (02204) 8309-118 ]
b.) magnetic tapes for steel-stabilized length measuring systems of large distances more than 100mm (only the thicknesses x# in above tables)
[flexible plastic material without multipolar magnetization by company Max Baermann GmbH , for example, tapes with thickness 1mm and width
5mm and tape length 30m , transverse unilateral multipolar magnetization must be implemented by a suitable third-party]
*3 Parameter of TROMAFLEX 928 by company Max Baermann GmbH :
flexible plastic bonded ferrite material 9/28p according to DIN 17410 , anisotropic Strontium Ferrite ,
Br = 220mT , BHc = 170 kA/m , IHc = 280 kA/m , BHmax. = 9,0 kJ/m3 , density = 3,5 g/m3 , middle strain coefficient = 4,49·10-5 m/K to 1m length ,
operating temperature range = -20°C to +70°C
*4 Parameter of TROMAFLEX 324 by company Max Baermann GmbH :
flexible plastic bonded ferrite material 3/24p according to DIN 17410 , isotropic Barium Ferrite ,
Br = 127mT , BHc = 91 kA/m , IHc = 240 kA/m , BHmax. = 3,0 kJ/m3 , density = 3,4 g/m3 , middle strain coefficient = 4,49·10-5 m/K to 1m length ,
operating temperature range = -20°C to +70°C
PRINCIPLES – Length Measurement with
Arc Tangent Interpolation
for ZMX40M
picture :
magnetic field representation
of magnetic tape (or strip)
picture :
mathematical principle
sensor output 1 (chip 1) : V1 = Hmax • cos (w • 2Π/Λ) = Hmax • sin ((w • 2Π/Λ)+Π/2)
sensor output 2 (chip 2) : V2 = Hmax • sin (w • 2Π/Λ)
way of movement : w = (Λ/2Π) • arctan (V2/V1)
Hmax = func (r , "magnetic structure")
r = gap between tape (or strip) and sensor
ISSUE 2 - JUNE 2005
5 SEMICONDUCTORS
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ZMX40M.PDF ] | |
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