AS5115-HSST-500 austriamicrosystems, AS5115-HSST-500 Datasheet - Page 10

• 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
Figure 5. Relationship of Peak Amplitude vs Magnet Thickness
As the graph in
Therefore, the recommended thickness of 2.5mm (at 6mm diameter) should be considered as the low limit with regards to magnet thickness.
It is possible to get 40% or more signal amplitude by using thicker magnets. However, the gain in signal amplitude becomes less significant for h/
d ratios >~1.3. Therefore, the recommended magnet thickness for a 6mm diameter magnet is between 2.5 and ~8 mm.
7.1.3 Axial Distance (Airgap)
Figure 6. Sinusoidal Magnetic Field Generated by the Rotating Magnet
The recommended magnetic field, measured at the chip surface on a radius equal to the Hall sensor array radius (typ 1mm) should be within a
certain range. This range lies between 45 and 75mT or between 20 and 80mT, depending on the encoder product.
Linear position sensors are more sensitive as they use weaker magnets. The allowed magnetic range lies typically between 5 and 60mT.
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160%
140%
120%
100%
80%
60%
40%
20%
0%
Figure 5
0,0
of a cylindrical diametric magnet with 6mm diameter
shows, the amplitude drops significantly at h/d ratios below this value and remains relatively flat at ratios above 1.3.
0,2
vertical
field
Bz amplitude vs. magnet thickness
B
0,4
0
thickness to diameter [h/d] ratio
0,6
d= 6mm x h= 2.5mm ref. magnet:
h/d = 0.42
Rel. amplitude = 100%
0,8
Revision 1.5
1,0
1,2
360º
1,4
1,6
1,8
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