DRV8824_16 Datasheet, PDF (14/35 Pages) Texas Instruments – Stepper Motor Controller IC

DRV8824
SLVSA06J – OCTOBER 2009 – REVISED JULY 2014
www.ti.com
Table 2 shows the relative current and step directions for different settings of MODEx. At each rising edge of the
STEP input, the indexer travels to the next state in the table. The direction is shown with the DIR pin high; if the
DIR pin is low, the sequence is reversed. Positive current is defined as xOUT1 = positive with respect to xOUT2.
Note that if the step mode is changed while stepping, the indexer advances to the next valid state for the new
MODEx setting at the rising edge of STEP.
The home state is 45°. This state is entered at power-up or application of nRESET. This is shown in Table 2 by
the shaded cells. The logic inputs DIR, STEP, nRESET, and MODEx have an internal pulldown resistors of
100 kΩ
1/32
STEP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
1/16
STEP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
1/8
STEP
1
2
3
4
5
6
7
8
9
10
Table 2. Relative Current and Step Directions
1/4
STEP
1
2
3
4
5
1/2
STEP
1
2
3
FULL STEP WINDING CURRENT WINDING CURRENT
70%
A
B
100%
0%
100%
5%
100%
10%
99%
15%
98%
20%
97%
24%
96%
29%
94%
34%
92%
38%
90%
43%
88%
47%
86%
51%
83%
56%
80%
60%
77%
63%
74%
67%
1
71%
71%
67%
74%
63%
77%
60%
80%
56%
83%
51%
86%
47%
88%
43%
90%
38%
92%
34%
94%
29%
96%
24%
97%
20%
98%
15%
99%
10%
100%
5%
100%
0%
100%
–5%
100%
–10%
100%
–15%
99%
–20%
98%
–24%
97%
ELECTRICAL
ANGLE
0
3
6
8
11
14
17
20
23
25
28
31
34
37
39
42
45
48
51
53
56
59
62
65
68
70
73
76
79
82
84
87
90
93
96
98
101
104
14
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