TMC4671 Datasheet • IC Version V1.00 | Document Revision V1.04 • 2018-Dec-11
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alone pulse or and-ed with NAB = N and A and B. It depends on the decoder what kind of N pulse has to be
used - either N or NAB. For those encoders with precise N pulse within one AB quadrant, the N pulse must
be used. For those encoders with N pulse over four AB quadrants the user can enhance the precision of
the N pulse position detection by using NAB instead of N.
Note
Incremental encoders are available with N pulse and without N pulse.
Figure 17: ABN Incremental Encoder N Pulse
The polarity of N pulse, A pulse and B pulse are programmable. The N pulse is for reinitialization with each
turn of the motor. Once fetched, the ABN decoder can be configured to write back the fetched N pulse
position with each N pulse.
Note
The ABN encoder interface has a direction bit to set to match wiring of motor to
direction of encoder.
Logical ABN = A and B and N might be useful for incremental encoders with low resolution N pulse to
enhance the resolution. On the other hand, for incremental encoders with high resolution N pulse a logical
ABN = A and B and N might totally suppress the resulting N pulse.
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