AS5134-ASSU austriamicrosystems, AS5134-ASSU Datasheet - Page 28

• Manufacturer Part Number: AS5134-ASSU
• Description: ENCODER, MAGNETIC, ROTARY, 8BIT, 20SSOP
• Manufacturer: austriamicrosystems

Specifications of AS5134-ASSU

• Brief Features: 9-Bit Multiturn Counter, User Programmable Zero Position And Sensitivity
• Supply Voltage Range: 4.5V To 5.5V
• Operating Temperature Range: -40°C To +140°C
• Digital Ic Case: RoHS Compliant
• Ic Function: Programmable High Speed Magnetic Rotary Encoder
• Rohs Compliant: Yes

AS5134
Data Sheet - D e t a i l e d D e s c r i p t i o n
Magnet Thickness
Figure 20
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.
Figure 20. Relationship of Peak Amplitude vs. Magnet Thickness
As the graph in
flat at ratios above 1.3.
Therefore, the recommended thickness of 2.5mm (@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.
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160%
140%
120%
100%
80%
60%
40%
20%
shows the relationship of the peak amplitude in a rotating system (essentially the magnetic field strength of
0%
0,0
Figure 20
of a cylindrical diametric magnet with 6mm diameter
0,2
shows, the amplitude drops significantly at h/d ratios below this value and remains relatively
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%
Revision 1.8
0,8
1,0
1,2
1,4
1,6
1,8
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