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 
Transition from one scale value to the next active value can be configured as slight
conversion. Two different parameters can be set in order to convert to higher or lower
closed-loop current scale values, as depicted in the chart below.
In order to configure a smooth transition from a lower motion current
scaling value to a higher motion current scaling value, do as follows:
Action:
 Set CL_UPSCALE_DELAY register 0x18 according to the delay period after which
the actual scale parameter is increased by one step towards the higher current
scale value.
Result:
Whenever a higher current scale value is assigned internally, the actual scale
parameter is increased by one step per CL_UPSCALE_DELAY clock cycles until the
assigned scale parameter is reached.
i If CL_UPSCALE_DELAY = 0, the higher current scaling value is immediately
assigned whenever the corresponding current scaling phase is activated.
In order to configure a smooth transition from a higher motion current
scaling value to a lower motion current scaling value, do as follows:
Action:
 Set CL_DNSCALE_DELAY register 0x19 according to the delay period after which
the actual scale parameter is decreased by one step towards the lower current
scale value.
Result:
Whenever a lower current scale value is assigned internally, the actual scale parameter
is decreased by one step per CL_DNSCALE_DELAY clock cycles until the assigned scale
parameter is reached.
i If CL_DNSCALE_DELAY = 0, the lower current scaling value is immediately
assigned whenever the corresponding current scaling phase is activated.
Figure 68: Closed-Loop Current Scaling Timing Behavior
t
0
Actual Current Scale Target Value
Actual Current Scale Value
CL
_
UPSCALE
_DELAY
=
0
CL
_
UPSCALE
_
DELAY
>
0
CL
_
DNSCALE
_
DELAY
>
0
CL
_
DNSCALE
_
DELAY
=
0
CL_IMAX
CL_IMIN
SCALE_PARAM
Closed-Loop
Scaling
Transition
Process Control