www.austriamicrosystems.com/AS5140H

Revision 1.4

26 - 37

AS5140H

Data Sheet - D e t a i l e d D e s c r i p t i o n

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

±0.235mm

3.9mm±0.235mm

1