Datasheet
TMC4361A Datasheet | Document Revision 1.22 • 2017-JAN-12
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Read entire documentation; especially the “Supplemental Directives” on page 224.
MAIN MANUAL
Explanatory Notes for Base Wave Inclinations
In the following example four segments are defined.
Each segment has a different base wave inclination to illustrate each
possible entry:
Segment 0: W0 = 3 which means that the increment value is +2 or +3.
Segment 1: W0 = 2 which means that the increment value is +1 or +2.
Segment 2: W0 = 1 which means that the increment value is 0 or +1.
Segment 3: W0 = 0 which means that the increment value is −1 or 0.
i In addition to the MSLUT curve (black line), which is defined by the given
ofs
bits, all four segments show upper limits (red line); in case all
ofs
bits in the
particular segments are set to 1.
i The green line shows the lower limit in case all
ofs
bits in the particular segments
are set to 0.
Figure 52: MSLUT Curve with all possible Base Wave Inclinations (highest Inclination first)
In order to set up a standard sine wave table for the MSLUT, the following
considerations have to be taken into account:
PRECONSIDERATIONS:
The microstep table for the standard sine wave begins with eight entries (0
to 7) {0, 1, 3, 4, 6, 7, 9, 10 …} etc.
The maximum difference between two values in this section is +2, whereas the
minimum difference is +1.
While advancing according to the table, the very first time the difference between
two MSLUT values is lower than +1 is between position 153 and position 154.
Both entries are identical.
The start value is 0 for the sine wave.
The calculated value for position 256 (i.e. start of cosine wave) is 247.
Description is continued on next page.
Definition of
Segments
0,1,2,3
Standard Sine
Wave Setup
Considerations
prior to SETUP
of MSLUT
y
256
0
+2/+3
+1/+2
+0/+1
-1/+0
255X1 X2 X3
Segment upper limits
Segment lower limits
0
Segment
inclination W