AS5134 DB austriamicrosystems, AS5134 DB Datasheet - Page 31

• Manufacturer Part Number: AS5134 DB
• Description: BOARD DEMO AS5134
• Manufacturer: austriamicrosystems

Specifications of AS5134 DB

• Sensor Type: Magnetic, Rotary Position
• Sensing Range: 360°
• Interface: USB
• Voltage - Supply: 5V USB or 9V
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: AS5134
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• Sensitivity: -

AS5134
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
8.5.4 Angle Error vs. Radial and Axial Misalignment
The angle error is the deviation of the actual angle vs. the angle measured by the encoder. There are several factors in the chip itself that contrib-
ute to this error, mainly offset and gain matching of the amplifiers in the analog signal path. On the other hand, there is the nonlinearity of the sig-
nals coming from the Hall sensors, caused by misalignment of the magnet and imperfections in the magnetic material.
Ideally, the Hall sensor signals should be sinusoidal, with equal peak amplitude of each signal. This can be maintained, as long as all Hall ele-
ments are within the linear range of the magnetic field Bz
8.5.5 Accuracy
Accuracy is defined as the error between the measured angle and the actual angle. It is influenced by several factors:
Misalignment of the magnet further reduces the accuracy.
misalignment. The center of the square XY-area corresponds to a centered magnet. 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 200µm. The gap between
surface and magnet is z=500µm.
Figure 23. 3D Graph Displaying Non-Linearity Over XY-Misalignment
www.austriamicrosystems.com/AS5134
the non-linearity of the analog-digital converters
internal gain and mismatch errors
non-linearity due to misalignment of the magnet
-1000
-600
-200
Y
200
Linearity Error over XY-misalignment [°]
600
1000
(see Figure
Figure 23
Revision 1.13
shows an example of a 3D-graph displaying non-linearity over XY-
20).
-1000
-600
-200
200
X
600
0
0.5
1
1.5
2
1000
2.5
3
3.5
3-3.5
2.5-3
2-2.5
1.5-2
1-1.5
0.5-1
0-0.5
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