Datasheet

TMC2590 DATASHEET (V1.0 / 2019-FEB-22) 40
www.trinamic.com
t
I
target current
target current - hysteresis start
target current + hysteresis start
on sd fd sd
target current + hysteresis end
target current - hysteresis end
HDEC
Figure 10.3 SpreadCycle chopper scheme showing coil current during a chopper cycle
Three parameters control SpreadCycle mode:
Parameter
Description
Setting
Comment
HSTRT
Hysteresis start setting. Please remark, that this
value is an offset to the hysteresis end value
HEND.
0… 7
This setting adds to
HEND.
%000: 1 %100: 5
%001: 2 %101: 6
%010: 3 %110: 7
%011: 4 %111: 8
HEND
Hysteresis end setting. Sets the hysteresis end
value after a number of decrements. Decrement
interval time is controlled by HDEC. The sum
HSTRT+HEND must be <16. At a current setting CS
of max. 30 (amplitude reduced to 240), the sum
is not limited.
0… 2
Negative HEND: -3… -1
%0000: -3
%0001: -2
%0010: -1
3
Zero HEND: 0
%0011: 0
4… 15
Positive HEND: 1… 12
%0100: 1 %1010: 7 1100: 9
%0101: 2 %1011: 8 1101: 10
%0110: 3 %1100: 9 1110: 11
%0111: 4 %1101: 10
%1000: 5 %1110: 11
%1001: 6 %1111: 12
HDEC
Hysteresis decrement setting. This setting
determines the slope of the hysteresis during on
time and during fast decay time. It sets the
number of system clocks for each decrement.
0… 3
0: fast decrement
3: very slow decrement
%00: 16
%01: 32
%10: 48
%11: 64