AS5311
Datasheet - D e t a i l e d D e s c r i p t i o n
7 Detailed Description
The different types of outputs relative to the magnet position are outlined in Figure 3 below.
The absolute serial output counts from 0….4095 within one pole pair and repeats with each subsequent pole pair.
Likewise, the PWM output starts with a pulse width of 1μs, increases the pulse width with every step of 0.488μm and reaches a maximum pulse
width of 4097μs at the end of each pole pair.
An index pulse is generated once for every pole pair.
256 incremental pulses are generated at each output A and B for every pole pair. The outputs A and B are phase shifted by 90 electrical degrees,
which results in 1024 edges per pole pair. As the incremental outputs are also repeated with every pole pair, a constant train of pulses is
generated as the magnet moves over the chip.
Figure 3. AS5311 Outputs Relative to Magnet Position
2mm
S
N
S
N
S
N
S
N
S
N
S
N
absolute output : 0 … .. 4095 0 … .. 4095 0 … .. 4095 0 … .. 4095 0 … .. 4095 0 … .. 4095
PWM output : 1 … . 4097μs
A : 256
B : 256
pulses / polepair
pulses / polepair
A + B = 1024 steps / polepair
Index : 1 pulse / polepair
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Revision 1.12
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