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AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Sensitivity Trimming. As the curves for the 4 samples in Figure 30 show, the AGC value will not show exactly the same value at a given
airgap on each part. For example, at 1mm vertical distance, the AGC may read a value between ~11 ~ 24. This is because for normal operation
an exact trimming is not required since the AGC is part of a closed loop system.
However, the AS5030 offers an optional user trimming in the OTP to allow an even tighter AGC tolerance for applications where the information
about magnetic field strength is also utilized, e.g. for rotate-and-push types of knobs, etc.
8.9 Choosing the Proper Magnet
Figure 31. Vertical Magnetic Fields of a Rotating Magnet
typ. 6mm diameter
Vertical field
component
N
R1
S
Magnet axis
Magnet axis
N
S
R1 concentric circle;
radius 1.0 mm
Vertical field
component
Bz
0
(20…80mT)
360
Note: There is no strict requirement on the type or shape of the magnet to be used with the AS5030. It can be cylindrical as well as square in
shape. The key parameter is that the vertical magnetic field B z , measured at a radius of 1mm from the rotation axis is sinusoidal with a
peak amplitude of 20 ~ 80mT.
www.ams.com/AS5030
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