AS5215-HQFT-OM AMSCO [austriamicrosystems AG], AS5215-HQFT-OM Datasheet - Page 10

• Manufacturer Part Number: AS5215-HQFT-OM
• Manufacturer: AMSCO [austriamicrosystems AG]

AS5215
Data Sheet - 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)
Large Diameter Magnet (>6mm)
+ stronger differential signal =
+ wider linear range =
good signal / noise ratio,
larger horizontal misalignment area
larger airgaps
- weaker differential signal =
- shorter linear range =
poorer signal / noise ratio,
smaller horizontal misalignment area
smaller airgaps
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]
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Revision 1.9
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