TMC5031 DATASHEET (Rev. 1.11 / 2016-APR-28)
28
5.3.2 CHOPCONF – Chopper Configuration
0X6C, 0X7C: CHOPCONF – CHOPPER CONFIGURATION
Bit Name
Function
Comment
-
reserved
set to 0
31
diss2g
short to GND
protection disable
0: Short to GND protection is on
1: Short to GND protection is disabled
30
-
reserved
reserved
reserved
reserved
reserved
set to 0
set to 0
set to 0
set to 0
set to 0
set to 0
29
-
28
-
27
-
26
-
25
-
reserved
SYNC
24
sync3
This register allows synchronization of the chopper for
23
PWM synchronization both phases of a two phase motor in order to avoid the
clock
sync2
22
occurrence of a beat, especially at low motor velocities.
It is automatically switched off above VHIGH.
%0000: Chopper sync function chopSync off
%0001 … %1111:
sync1
21
sync0
20
Synchronization with fSYNC = fCLK/(sync*64)
Hint: Set TOFF to a low value, so that the chopper cycle
is ended, before the next sync clock pulse occurs. Set for
the double desired chopper frequency for chm=0, for the
desired base chopper frequency for chm=1.
vhighchm high velocity chopper This bit enables switching to chm=1 and fd=0, when
19
mode
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.
vhighfs
vsense
high velocity fullstep This bit enables switching to fullstep, when VHIGH is
18
17
selection
exceeded. Switching takes place only at 45° position.
The fullstep target current uses the current value from
the microstep table at the 45° position.
sense resistor voltage 0: Low sensitivity, high sense resistor voltage
based current scaling
1: High sensitivity, low sense resistor voltage
tbl1
tbl0
chm
TBL
%00 … %11:
16
15
14
blank time select
Set comparator blank time to 16, 24, 36 or 54 clocks
Hint: %10 is recommended for most applications
chopper mode
0
1
Standard mode (spreadCycle)
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.
rndtf
disfdcc
fd3
random TOFF time
fast decay mode
TFD [3]
0
1
Chopper off time is fixed as set by TOFF
Random mode, TOFF is random modulated by
dNCLK= -12 … +3 clocks.
13
12
11
chm=1:
disfdcc=1 disables current comparator usage for termi-
nation of the fast decay cycle
chm=1:
MSB of fast decay time setting TFD
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