AS5115-HSST-500 austriamicrosystems, AS5115-HSST-500 Datasheet - Page 9

• Manufacturer Part Number: AS5115-HSST-500
• Description: IC ENCODER ROTARY 16-SOIC
• Manufacturer: austriamicrosystems
• Type: Linear, Rotary - Programmabler

Specifications of AS5115-HSST-500

• Sensing Range: 20mT Trip, 80mT Release
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 28mA
• Current - Output (max): 1mA
• Output Type: Analog, Digital
• Features: High Precision
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 16-SSOP (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS5115-HSST-500TR; AS5115-HSSU

AS5115
Preliminary 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
4), 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 4. Vertical Magnetic Field Across the Center of a Cylindrical Magnet
Bz; 6mm magnet @ y=0; z=1mm
Hall elements (side view)
X -displacement [mm]
7.1.2 Magnet Thickness
Figure 5
shows the relationship of the peak amplitude in a rotating system (essentially the magnetic field strength of the Bz field component) in
relation to the thickness of the magnet. The X-axis shows the ratio of magnet thickness (or height) [h] to magnet diameter [d] and the Y-axis
shows the relative peak amplitude with reference to the recommended magnet (d=6mm, h=2.5mm). This results in an h/d ratio of 0.42.
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