Datasheet

TMC4361A Datasheet | Document Revision 1.22 • 2017-JAN-12
147/230
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Read entire documentation; especially the “Supplemental Directives” on page 224.
 MAIN MANUAL 
It can be useful to specify A and B channel signal polarities for N event. Per default,
the polarities of both signal lines are set to 0 (low active).
In order to set up A channel polarity to high active for N event, do as
follows:
Action:
 Set pol_a_for_n = 1 ( ENC_CONF register 0x07).
Result:
Now, A channel signal polarity for N event is high active.
In order to set up B channel polarity to high active for N event, do as
follows:
Action:
 Set pol_b_for_n = 1 ( ENC_CONF register 0x07).
Result:
Now, B channel signal polarity for N event is high active.
In case A and B channel polarities do not have an influence on N event, both A and B
channel polarity signals can be ignored.
In order to ignore A and B channel polarities, do as follows:
Action:
 Set ignore_ab = 1 ( ENC_CONF register 0x07).
Result:
Now, the A and B channel signal polarities have no influence on N event.
N event can be used to clear the external position register ENC_POS 0x50. Two choices
are available: continous clearing and single clearing.
i Common practice is to clear to 0. However, TMC4361A offers the possibility to
clear to any single microstep count.
In order to set ENC_POS on N event to continuous clearing, do as follows:
Action:
 Set ENC_RESET_VAL register 0x51 to the requested microstep position.
 Set clr_latch_cont_on_n = 1 ( ENC_CONF register 0x07).
 Set clear_on_n = 1 ( ENC_CONF register 0x07).
Result:
On every N event ENC_POS is set to ENC_RESET_VAL .
In order to only clear ENC_POS for the next N event, do as follows:
Action:
 Set ENC_RESET_VAL register 0x51 to the requested microstep position.
 Set clr_latch_cont_on_n = 0 ( ENC_CONF register 0x07).
 Set clr_latch_once_on_n = 1 ( ENC_CONF register 0x07).
 Set clear_on_n = 1 ( ENC_CONF register 0x07).
Result:
When the next N event occurs, ENC_POS is set to ENC_RESET_VAL . After the
particular N event, clr_latch_once_on_n is automatically reset to 0.
A and B Channel
Signal Polarities
for N Event
External Position
Counter
ENC_POS
Clearing
ENC_POS
Continous
Clearing
ENC_POS Single
Clearing