Texas Instruments TIDA-060040, Manual

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Off-Axis Sensor Alignment shows a sensor location where the only change from the in-plane sensor alignment
is a vertical offset of 3.175 mm. This results with the same horizontal alignment from the magnet face, and the
sensor is now coplanar to the upmost face of the magnet. In this location the magnitude of each field component
is shown in
Off-Axis Magnetic Field Inputs .
Angle (deg)
Mag
netic Flux
Den
sity (m
T)
0 45 90 135 180 225 270 315 360
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
Bx
By
Bz
Figure 2-12. Off-Axis Magnetic Field Inputs
Depending on the vertical placement, the magnitude of each field component may vary, and use of a 3D sensor
allows for selection of the two axes which provide the best quality inputs.
Aside from the off-axis and in-plane positions, the final alignment to examine is the on-axis placement.
Figure 2-13. On-Axis Sensor Alignment
This is a unique location where the magnetic field vector is inherently parallel to the circular face of the magnet.
This condition is ideal for 3D sensors, such as
TMAG5170 . Since the vector is entirely within the XY plane, a
single sensor should experience perfectly sinusoidal inputs when monitoring these axes.
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