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AS5311
Datasheet - D e t a i l e d D e s c r i p t i o n
7.2 Incremental Output Hysteresis
Figure 5. Hysteresis Illustration
Incremental
Output
Indication
X +4
X +3
X +2
X +1
Hysteresis:
2 steps
X
X
X +1 X +2 X +3 X +4 X +5
Magnet Position
Movement left --> right
Movement right --> left
To avoid flickering incremental outputs at a stationary magnet position, a hysteresis is introduced.
In case of a movement direction change, the incremental outputs have a hysteresis of 2 LSB. For constant movement directions, every magnet
position change is indicated at the incremental outputs (see Figure 4) . If for example the magnet moves from position “x+3” to “x+4”, the
incremental output would also indicate this position accordingly.
A change of the magnet’s movement direction back to position “x+3” means, that the incremental output still remains unchanged for the duration
of 2 LSB, until position “x+2” is reached. Following this movement, the incremental outputs will again be updated with every change of the
magnet position.
7.3 Synchronous Serial Interface (SSI)
The Serial interface allows data transmission of the 12-bit absolute linear position information (within one pole pair = 2.0mm). Data bits D11:D0
represent the position information with a resolution of 488nm (2000μm / 4096) per step. CLK must be high at the falling edge of CSn.
Figure 6. Synchronous Serial Interface with Absolute Angular Position Data
CSn
t CLK FE
t CLK FE
T CLK/2
t CSn
CLK
1
8
18
1
DO
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
OCF
COF
LIN
Mag
INC
Mag
DEC
Even
PAR
D11
t DO active
www.ams.com/AS5311
t DO valid
Angular Position Data
Revision 1.12
Status Bits
t DO Tristate
12 - 29
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