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AS5215
Datasheet - D e t a i l e d D e s c r i p t i o n
For the 6mm magnet (shown in Figure 5 ), the linear range has a radius of 1.6mm, hence this magnet allows a radial misalignment of 0.5mm
(1.6mm linear range radius; 1mm Hall array radius). Consequently, the larger the linear range, the more radial misalignment can be tolerated. By
contrast, the slope of the linear range decreases with increasing magnet diameter, as the poles are further apart. A smaller slope results in a
smaller differential signal, which means that the magnet must be moved closer to the IC (smaller airgap) or the amplification gain must be
increased, which leads to a poorer signal-to-noise ratio. More noise results in more jitter at the angle output. A good compromise is a magnet
diameter in the range of 5…8mm.
Small Diameter Magnet (<6mm)
+ stronger differential signal =
good signal / noise ratio,
larger airgaps
- shorter linear range =
smaller horizontal misalignment area
Figure 5. Vertical Magnetic Field Across the Center of a Cylindrical Magnet
Bz; 6mm magnet @ y=0; z=1mm
Hall elements (side view)
X -displacement [mm]
Large Diameter Magnet (>6mm)
+ wider linear range =
larger horizontal misalignment area
- weaker differential signal =
poorer signal / noise ratio,
smaller airgaps
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Revision 1.11
10 - 26
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