AS5215-HQFT-500 austriamicrosystems, AS5215-HQFT-500 Datasheet - Page 11

• Manufacturer Part Number: AS5215-HQFT-500
• Description: IC ENCODER ROTARY 32-QFN
• Manufacturer: austriamicrosystems
• Type: Linear, Rotary Encoder - Programmabler

Specifications of AS5215-HQFT-500

• Featured Product: AS5215 - Automotive Rotary Encoder IC
• Sensing Range: 20mT ~ 80mT
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 28mA
• Output Type: Differential Voltage
• Features: Programmable
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 32-VQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output (max): -
• Other names: AS5215-HQFT-500TR

AS5215
Data Sheet - D e t a i l e d D e s c r i p t i o n
7.1.2 Magnet Thickness
Figure 6
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.
Figure 6. 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.
www.austriamicrosystems.com/AS5215
shows the relationship of the peak amplitude in a rotating system (essentially the magnetic field strength of the Bz field component) in
160%
140%
120%
100%
80%
60%
40%
20%
0%
Figure 6
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
Bz amplitude vs. magnet thickness
0,4
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 1.9
1,0
1,2
1,4
1,6
1,8
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