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36 - 41

AS5130

Data Sheet - A p p l ic at i on I n f o r m at i on

Figure 32. Typical Error Curve of INL Error Over Lateral Displacement (including quantization error)

Magnet Size

Figure 30 to Figure 32 illustrate a cylindrical magnet with a diameter of 6mm. Smaller magnets may also be used, but

since the poles are closer together, the linear range will also be smaller and consequently the tolerance for lateral

misalignment will also be smaller.

If the ±0.25mm lateral misalignment radius (rotation axis to IC package center) is too tight, a larger magnet can be

used. Larger magnets have a larger linear range and allow more misalignment. However at the same time the slope of

the magnet is more flat, which results in a lower differential amplitude. This requires either a stronger magnet or a

smaller gap between IC and magnet in order to operate in the amplitude-controlled area (AGC >0 and AGC < 63).

In any case, if a magnet other than the recommended 6mm diameter magnet is used, two paramters should be

verified:

Verify, that the magnetic field produces a sinusoidal wave, when the magnet is rotated. Note that this can be done

with the SIN-/COS- outputs of the AS5130; e.g. rotate the magnet at constant speed and analyze the SIN- (or

COS-) output with an FFT-analyzer. It is recommended to disable the AGC for this test (see Analog Sin/Cos Out-

puts with External Interpolator on page 14).

from the magnet supplier(s). Alternatively, the SIN- or COS- output of the AS5130 may also be used together with

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-250

0

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0

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1000

0,000

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1,000

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2,000

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3,000

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4,000

4,500

5,000

INL [°]

X Displacement [µm]

Y Displacement [µm]

INL vs. Displacement: AS5030 for AGC24

4,500-5,000

4,000-4,500

3,500-4,000

3,000-3,500

2,500-3,000

2,000-2,500

1,500-2,000

1,000-1,500

0,500-1,000

0,000-0,500