AS5040 View Datasheet(PDF) - austriamicrosystems AG
Part Name
Description
Manufacturer
AS5040 Datasheet PDF : 33 Pages
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AS5040
Data Sheet
18 Angular Output Tolerances
Accuracy
Accuracy is defined as the error between measured angle and actual angle. It is influenced by several factors:
ƒ the non-linearity of the analog-digital converters,
ƒ internal gain and mismatch errors,
ƒ non-linearity due to misalignment of the magnet
As a sum of all these errors, the accuracy with centered magnet = (Errmax – Errmin)/2 is specified as better than ±0.5
degrees @ 25°C (see Figure 25).
Misalignment of the magnet further reduces the accuracy. Figure 24 shows an example of a 3D-graph displaying non-
linearity over XY-misalignment. The center of the square XY-area corresponds to a centered magnet (see dot in the
center of the graph). The X- and Y- axis extends to a misalignment of ±1mm in both directions. The total misalignment
area of the graph covers a square of 2x2 mm (79x79mil) with a step size of 100µm.
For each misalignment step, the measurement as shown in Figure 25 is repeated and the accuracy
(Errmax – Errmin)/2 (e.g. 0.25° in Figure 25) is entered as the Z-axis in the 3D-graph.
Figure 24: Example of Linearity Error over XY Misalignment
Linearity Error over XY-misalignment [°]
6
5
4
°3
2
1
0
y
1000
800
600
400
200
0
-200 x
-400
-600
-800
-1000
The maximum non-linearity error on this example is better than ±1 degree (inner circle) over a misalignment radius of
~0.7mm. For volume production, the placement tolerance of the IC within the package (±0.235mm) must also be
taken into account.
The total nonlinearity error over process tolerances, temperature and a misalignment circle radius of 0.25mm is
specified better than ±1.4 degrees.
The magnet used for this measurement was a cylindrical NdFeB (Bomatec® BMN-35H) magnet with 6mm diameter
and 2.5mm in height.
www.austriamicrosystems.com
Revision 2.10
26 - 33
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