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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
7.1 Incremental Outputs
Figure 4 shows the two-channel quadrature output of the AS5311. Output A leads output B when the magnet is moving from right to left and
output B leads output A when the magnet is moving from left to right (see Figure 14) .
Figure 4. Incremental Outputs
Incremental outputs
Mechanical
Zero Position
Movement Direction
Change
Mechanical
Zero Position
A
B
Index=0
Index
1LSB
Hyst =
2 LSB
CSn
t Incremental outputs valid
Movement right to left
Movement left to right
7.1.1
Incremental Power-up Lock Option
After power-up, the incremental outputs can optionally be locked or unlocked, depending on the status of the CSn pin:
CSn = low at power-up: CSn has an internal pull-up resistor and must be externally pulled low (R ext ≤ 5k Ω ). If Csn is low at power-up, the
incremental outputs A, B and Index will be high until the internal offset compensation is finished. This unique state may be used as an indicator
for the external controller to shorten the waiting time at power-up. Instead of waiting for the specified maximum power up-time (see Electrical
System Specifications on page 8) , the controller can start requesting data from the AS5311 as soon as the state (A= B= Index = high) is cleared.
CSn = high or open at power-up: In this mode, the incremental outputs (A, B, Index) will remain at logic high state after power-up, until
CSn goes low or a low pulse is applied at CSn and internal offset compensation is finished. This mode allows intentional disabling of the
incremental outputs after power-up until for example the system microcontroller is ready to receive data.
Once the incremental outputs are unlocked they can not be disabled during operation.
www.ams.com/AS5311
Revision 1.12
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