www.austriamicrosystems.com/AS5140H
Revision 1.4
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AS5140H
Data Sheet - Detailed Description
Figure 20. Vertical Placement of the Magnet
7.10 Simulation Modeling
With reference to Figure 21, a diametrically magnetized permanent magnet is placed above or below the surface of the AS5140H. The chip uses
an array of Hall sensors to sample the vertical vector of a magnetic field distributed across the device package surface. The area of magnetic
sensitivity is a circular locus of 1.1mm radius with respect to the center of the die. The Hall sensors in the area of magnetic sensitivity are
grouped and configured such that orthogonally related components of the magnetic fields are sampled differentially. The differential signal Y1-Y2
will give a sine vector of the magnetic field. The differential signal X1-X2 will give an orthogonally related cosine vector of the magnetic field.
Figure 21. Arrangement of Hall Sensor Array on Chip (principle)
N
S
N
Die surface
Package surface
Z
0.576mm ?0.1mm
1.282mm ?0.15mm
Y1
Y2
X1
X2
Center of die
Radius of circular Hall sensor
AS5140H die
2.433mm
?.235mm
3.9mm?.235mm
1
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