AS5311

Data Sheet

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Revision 1.01

11 - 23

7.1

Incremental Outputs

Figure 6 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 6: Incremental Outputs

Movement left to right

A

B

Incremental outputs

Index=0

1LSB

Index

Mechanical

Zero P osition

Movement Direction

Change

CSn

Hyst =

2 LS B

Movem ent right to left

M echanical

Zero Position

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:

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 6.5), 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, until CSn goes low or

a low pulse is applied at CSn. This mode allows intentional disabling of the incremental outputs until for

example the system microcontroller is ready to receive data.