DRV8711_15 Datasheet, PDF (27/44 Pages) Texas Instruments – DRV8711 Stepper Motor Controller IC

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7.6.5 BLANK Register Address = 0x3h
DRV8711
SLVSC40E – JUNE 2013 – REVISED MARCH 2015
BIT
7-0
8
11-9
NAME
TBLANK
ABT
Reserved
SIZE R/W
8
R/W
1
R/W
3
-
DEFAULT
0x80h
0
-
DESCRIPTION
Sets current trip blanking time, in increments of 20 ns
0x00h: 1 µs
…
0x32h: 1 µs
0x33h: 1.02 µs
…
0xFEh: 5.10 µs
0xFFh: 5.12 µs
Also sets minimum on-time of PWM
0: Disable adaptive blanking time
1: Enable adaptive blanking time
Reserved
7.6.6 DECAY Register Address = 0x4h
BIT
NAME
SIZE R/W
DEFAULT
7-0
TDECAY
8
R/W
0x10h
10-8
DECMOD
3
R/W
001
11
Reserved
1
-
-
DESCRIPTION
Sets mixed decay transition time, in increments of 500 ns
000: Force slow decay at all times
001: Slow decay for increasing current, mixed decay for
decreasing current (indexer mode only)
010: Force fast decay at all times
011: Use mixed decay at all times
100: Slow decay for increasing current, auto mixed decay for
decreasing current (indexer mode only)
101: Use auto mixed decay at all times
110 – 111: Reserved
Reserved
7.6.7 STALL Register Address = 0x5h
BIT
NAME
SIZE R/W
DEFAULT
7-0
SDTHR
8
R/W
0x40h
9-8
SDCNT
2
R/W
00
11-10
VDIV
2
R/W
00
DESCRIPTION
Sets stall detect threshold
The correct setting needs to be determined experimentally
00: STALLn asserted on first step with back EMF below SDTHR
01: STALLn asserted after 2 steps
10: STALLn asserted after 4 steps
11: STALLn asserted after 8 steps
00: Back EMF is divided by 32
01: Back EMF is divided by 16
10: Back EMF is divided by 8
11: Back EMF is divided by 4
7.6.8 DRIVE Register Address = 0x6h
BIT
NAME
SIZE R/W
DEFAULT DESCRIPTION
1-0
OCPTH
2
R/W
OCP threshold
00: 250 mV
00
01: 500 mV
10: 750 mV
11: 1000 mV
3-2
OCPDEG
2
R/W
OCP deglitch time
00: 1 µs
01
01: 2 µs
10: 4 µs
11: 8 µs
5-4
TDRIVEN
2
R/W
Low-side gate drive time
00: 250 ns
01
01: 500 ns
10: 1 µs
11: 2 µs
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