AS5130ATST AMSCO [austriamicrosystems AG], AS5130ATST Datasheet - Page 36

• Manufacturer Part Number: AS5130ATST
• Description: 8 Bit Programmable Magnetic Rotary Encoder with Motion Detection & Multiturn
• Manufacturer: AMSCO [austriamicrosystems AG]

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 32. Typical Error Curve of INL Error Over Lateral Displacement (including quantization error)
Magnet Size
Figure 30
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:
www.austriamicrosystems.com
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
puts with External Interpolator on page
Verify that the B
from the magnet supplier(s). Alternatively, the SIN- or COS- output of the AS5130 may also be used together with
an X-Y- table to get a B
INL [°]
to
5,000
Figure 32
4,500
4,000
3,500
3,000
2,500
2,000
1,500
1,000
z
0,500
-Curve between the poles is as linear as possible
0,000
illustrate a cylindrical magnet with a diameter of 6mm. Smaller magnets may also be used, but
X Displacem ent [µm ]
-1000
z
-scan of the magnet (as in
-750
-500
INL vs. Displacement: AS5030 for AGC24
-250
14).
0
250
500
Revision 1.00
Figure 30
750
1000
or
-1000
Figure
-750
-500
(see Figure
-250
31). Furthermore, the sinewave tests
0
250
Y Displacem ent [µm ]
500
750
30). This curve may be available
1000
(see Analog Sin/Cos Out-
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
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