Datasheet

TMC2041 DATASHEET (Rev. 1.02 / 2017-MAY-16) 28
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6.3.1 CHOPCONF – Chopper Configuration
0X6C, 0X7C: CHOPCONF – CHOPPER CONFIGURATION
Bit
Name
Function
Comment
31
-
reserved
set to 0
30
diss2g
short to GND
protection disable
0: Short to GND protection is on
1: Short to GND protection is disabled
29
dedge
enable double edge
step pulses
1: Enable step impulse at each step edge to reduce step
frequency requirement.
28
intpol16
16 microsteps with
interpolation
1: In 16 microstep mode, the microstep resolution
becomes extrapolated to 256 microsteps for smoothest
motor operation
27
mres3
MRES
micro step resolution
%0000:
Native 256 microstep setting.
26
mres2
25
mres1
24
mres0
%0001 … %1000:
128, 64, 32, 16, 8, 4, 2, FULLSTEP
Reduced microstep resolution.
The resolution gives the number of microstep entries per
sine quarter wave.
Especially when switching to a low resolution of 8
microsteps and below, take care to switch at certain
microstep positions. The switching position determines the
sequence of patterns.
step width=2^MRES [microsteps]
23
-
reserved
set to 0
22
-
21
-
20
-
19
-
reserved
set to 0
18
-
reserved
set to 0
17
vsense
sense resistor voltage
based current scaling
0: Low sensitivity, high sense resistor voltage
1: High sensitivity, low sense resistor voltage
16
tbl1
TBL
blank time select
%00 … %11:
Set comparator blank time to 16, 24, 36 or 54 clocks
Hint: %01 or %10 recommended for most applications
15
tbl0
14
chm
chopper mode
0
Standard mode (spreadCycle)
1
Constant off time with fast decay time.
Fast decay time is also terminated when the
negative nominal current is reached. Fast decay is
after on time.
13
rndtf
random TOFF time
0
Chopper off time is fixed as set by TOFF
1
Random mode, TOFF is random modulated by
dN
CLK
= -12 … +3 clocks.
12
disfdcc
fast decay mode
chm=1:
disfdcc=1 disables current comparator usage for termi-
nation of the fast decay cycle