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 
Setup of MSLUT Segments
All base wave inclination values (each consists of two bits) as well as the border values
(each consists of eight bit) between the segments are adjustable. They are assigned
by MSLUTSEL register 0x78.
In order to change the base wave inclination values and the segment
borders, do as follows:
Action:
 Define the segment borders X1, X2, and X3 and the base wave inclination values
W0…W3 according to the requirements
 Set register MSLUTSEL (31:24) = X3.
 Set register MSLUTSEL (23:16) = X2.
 Set register MSLUTSEL (15:8) = X1.
 Set register MSLUTSEL (7:6) = W3.
 Set register MSLUTSEL (5:4) = W2.
 Set register MSLUTSEL (3:2) = W1.
 Set register MSLUTSEL (1:0) = W0.
Result:
The segments and the base wave inclination values of the internal MSLUT are
changed.
NOTE:
 It is not mandatory to define four segments. For instance, if only two segments
are required, set X2 and X3 to 255. Then, W0 is valid for segment 0 between
MSCNT = 0 and MSCNT = X1, and W1 is valid between MSCNT = X1 and
MSCNT = 255 (segment 1).
In order to change the ofs bits, do as follows:
Action:
 Set MSLUT [0] register 0x70 = ofs 31… ofs 00.
 Set MSLUT [1] register 0x71 = ofs 63… ofs 32.
 Set MSLUT [2] register 0x72 = ofs 95… ofs 64.
 Set MSLUT [3] register 0x73 = ofs 127… ofs 96.
 Set MSLUT [4] register 0x74 = ofs 159… ofs 128.
 Set MSLUT [5] register 0x75 = ofs 191… ofs 160.
 Set MSLUT [6] register 0x76 = ofs 223… ofs 192.
 Set MSLUT [7] register 0x77 = ofs 255… ofs 224.
Result:
The ofs bits of the internal MSLUT are changed.
When modifying the wave:
Special care has to be applied in order to ensure a smooth and symmetrical zero
transition whenever the quarter wave becomes expanded to a full wave.
When adjusting the range:
The maximum resulting swing of the wave should be adjusted to a range of
−248 to 248, in order to achieve the best possible resolution while at the same time
leaving headroom for a hysteresis based chopper to add an offset.
Base Wave
Inclination and
Border Values
!
AREAS OF
SPECIAL
CONCERN
Zero Crossing