Datasheet

TMC5041 DATASHEET (Rev. 1.13 / 2017-MAY-16) 31
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5.4.1 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
-
reserved
set to 0
28
-
reserved
set to 0
27
mres3
MRES
micro step resolution
%0000:
Native 256 microstep setting.
Use this setting for normal operation.
26
mres2
25
mres1
24
mres0
%0001 … %1000:
128, 64, 32, 16, 8, 4, 2, FULLSTEP
Reduced microstep resolution (only for special use!).
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]
Hint: Different microstep resolutions are only intended
for special cases to extend the acceleration or position
range
23
-
reserved
set to 0
22
-
21
-
20
-
19
vhighchm
high velocity chopper
mode
This bit enables switching to chm=1 and fd=0, when VHIGH
is exceeded. This way, a higher velocity can be achieved.
Can be combined with vhighfs=1. If set, the TOFF setting
automatically becomes doubled during high velocity
operation in order to avoid doubling of the chopper
frequency.
18
vhighfs
high velocity fullstep
selection
This bit enables switching to fullstep, when VHIGH is
exceeded. Switching takes place only at 45° position.
The fullstep target current uses the current value from
the microstep table at the 45° position.
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