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AS5311

Datasheet - A pp l ic a t io n I n f or m a t i on

8.5 AS5311 Off-axis Rotary Applications

The AS5311 can also be used as an off-axis rotary encoder, as shown in Figure 11. In such applications, the multi-pole magnetic strip is replaced

by a multi-pole magnetic ring. The ring can have radial or axial magnetization.

Figure 16. Angular Resolution and Maximum Speed vs. Ring Diameter

In off-axis rotary applications, very high angular resolutions are possible with the AS5311.

The number of steps per revolution increases linearly with ring diameter.

Due to the increasing number of pulses per revolution, the maximum speed decreases with increasing ring diameter.

Res [bit]

Steps per Revolution

Ring Diameter [mm]

Maximum Speed [rpm]

15

32768

20.9

609

16

65536

41.7

305

17

131072

83.4

152

AS5311 off-axis rotary resolution & speed

0

20000

40000

60000

80000

100000

120000

140000

160000

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100

ring diameter [mm]

0

100

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resolution

speed rpm