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AS5030

Datasheet - Application In formatio n

Figure 33. Vertical Magnetic Field Distribution of a Cylindrical 6mm Ø Diametric Magnetized Magnet at 1mm Gap

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).

4

3

2

1

0

-1

-2

-3

-4

4

3

2

2

1

0

-1

-2

-3

-125

-100

-75

-50

-25

0

25

50

75

100

125

Bz [m T]

Y-displacement [m m]

X-displacem ent [m m]

BZ; 6m m m agnet @ Z=1mm

area of X-Y-misalignment from

center: +/- 0.5mm

circle of Hall elements on

chip: 1mm radius

N

S