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AS5130

Data Sheet - A p p l i c a t i o n I n f o r m a t i o n

Figure 31. Vertical Magnetic Field Distribution of a Cylindrical 6mmØ Diametric Magnetized Magnet at 1mm Gap

Figure 31 shows the same vertical field component as Figure 30, but in a 3-dimensional view over an area of +/-4mm

from the rotational axis.

Lateral Displacement of the Magnet

As shown in the magnet specifications (see Parameters for Magnet under Electrical Characteristics on page 6), 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 32 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 ±0.7º (refer to Quantization Error on page 30). For example, the accuracy for a

centered magnet is between 1.0 – 1.5º (spec = 2º over full temperature range). Within a radius of 0.5mm, the accuracy

is better than 2.0º (spec = 3º 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 [mT]

Y-displacement [mm]

X-displacement [mm]

BZ; 6mm magnet @ Z=1mm

area of X-Y-misalignment from

center: +/- 0.5mm

circle of Hall elements on

chip: 1mm radius

N

S