AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 33. Vertical Magnetic Field Distribution of a Cylindrical 6mm ? Diametric Magnetized Magnet at 1mm Gap
BZ; 6m m m agnet @ Z=1mm
area of X-Y-misalignment from
125
N
center: +/- 0.5mm
circle of Hall elements on
chip: 1mm radius
100
75
50
25
B z [m T]
0
-25
-50
-75
-100
-125
2
3
4
4
3
2
2
1
0
S
-3
-2
-1
1
0
Y-displacement [m m]
X-displacem ent [m m]
-1
-2
-4
-3
Figure 33 shows the same vertical field component as Figure 32 , but in a 3-dimensional view over an area of ± 4mm from the rotational axis.
8.9.2
Lateral Displacement of the Magnet
As shown in the magnet specifications (see page 7) , the recommended horizontal position of the magnet axis with respect to the IC package
center is within a circle of 0.25mm radius. This includes the placement tolerance of the IC within the package.
Figure 34 shows a typical error curve at a medium vertical distance of the magnet around 1.2mm (AGC = 24).
The X- and Y- axis of the graph indicate the lateral displacement of the magnet center with respect to the IC center.
At X = Y = 0, the magnet is perfectly centered over the IC. The total displacement plotted on the graph is for ± 1mm in both directions.
The Z-axis displays the worst case INL error over a full turn at each given X-and Y- displacement. The error includes the quantization error of ±
0.7°. For example, the accuracy for a centered magnet is between 1.0 ~ 1.5° (spec = 2° over full temperature range). Within a radius of 0.5mm,
the accuracy is better than 2.0° (spec = 3° over temperature).
www.ams.com/AS5030
Revision 2.4
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