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| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 28/44页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRVR MICRO STEP 28TSSOP |
| 特色产品： | A4979 Series |
| 标准包装： | 1 |
| 应用： | 直流电机驱动器，PWM 电机驱动器，步进电机驱动器 |
| 评估套件： | 可供 |
| 输出数： | 1 |
| 电流 - 输出： | 1.5A |
| 电压 - 负载： | 7 V ~ 50 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | 620-1463-6 |
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A4979
Microstepping Programmable Stepper Motor Driver
With Stall Detect and Short Circuit Protection
per mechanical step, 4 mechanical steps per electrical cycle, and
2 phases this gives a total of 128 values. However, due to symme-
try, described below, this reduces to 17 independent values, one
of which is always zero. The remaining 16 values can be loaded
sequentially through the serial interface using the Phase Table
Load register. Figure 10 shows the default phase table values
plotted by Step Angle Number. Similar information is provided in
table 7.
The diagram in figure 10 is marked with four quadrants, Q1 to
Q4. The set of phase table values is the same in each quadrant in
each phase. Consider phase A (bottom graph), quadrant 1 (Q1).
This contains Step Angle Numbers 0 to 15. The default values
in these 16 positions are selected to produce one quarter of a
sinusoid.
Now consider the next quadrant (Q2) of phase A. The sequence
of values in this quadrant form a mirror image, by Step Angle
Number, of the values in Q1 so the same values are used but
entered in the reverse sequence.
The following table shows the Step Angle Number in the first
row increasing from 0 to 15, from left to right, and the default
values also increasing from left to right in the second row. These
Table 7. Phase Current Table (default, power-on content)
Phase Current
Step
Phase Current
Step
Step Angle Number
(% of I PMAX )
Angle
Phase
DAC
Step Angle Number
(% of I PMAX )
Angle
Phase
DAC
Full 1/2
1/4
1/8 1/16
A
B
A
B
A
B
Full 1/2
1/4
1/8 1/16
A
B
A
B
A
B
0
0
0
0
0.00 100.00
0.0
0
0
0
63
4
8
16
32 0.00 -100.00
180.0
0
1
0
63
1
9.38 100.00
5.4
0
0
5
63
33 -9.38 -100.00
185.4
1
1
5
63
1
2
3
18.75 98.44
29.69 95.31
10.8
17.3
0
0
0
0
11
18
62
60
17
34 -18.75 -98.44
35 -29.69 -95.31
190.8
197.3
1
1
1
1
11
18
62
60
1
2
4
37.50 92.19
22.1
0
0
23
58
9
18
36 -37.50 -92.19
202.1
1
1
23
58
5
46.88 87.50
28.2
0
0
29
55
37 -46.88 -87.50
208.2
1
1
29
55
3
6
7
56.25 82.81
64.06 76.56
34.2
39.9
0
0
0
0
35
40
52
48
19
38 -56.25 -82.81
39 -64.06 -76.56
214.2
219.9
1
1
1
1
35
40
52
48
0
1
2
4
8
70.31 70.31
45.0
0
0
44
44
2
5
10
20
40 -70.31 -70.31
225.0
1
1
44
44
9
76.56 64.06
50.1
0
0
48
40
41 -76.56 -64.06
230.1
1
1
48
40
5
10
11
82.81 56.25
87.50 46.88
55.8
61.8
0
0
0
0
52
55
35
29
21
42 -82.81 -56.25
43 -87.50 -46.88
235.8
241.8
1
1
1
1
52
55
35
29
3
6
12
92.19 37.50
67.9
0
0
58
23
11
22
44 -92.19 -37.50
247.9
1
1
58
23
13
95.31 29.69
72.7
0
0
60
18
45 -95.31 -29.69
252.7
1
1
60
18
7
14
15
98.44 18.75
100.00 9.38
79.2
84.6
0
0
0
0
62
63
11
5
23
46 -98.44 -18.75
47 -100.00 -9.38
259.2
264.6
1
1
1
1
62
63
11
5
2
4
8
16
100.00 0.00
90.0
0
0
63
0
6
12
24
48 -100.00 0.00
270.0
1
1
63
0
17
100.00 -9.38
95.4
0
1
63
5
49 -100.00 9.38
275.4
1
0
63
5
9
18
19
98.44 -18.75
95.31 -29.69
100.8
107.3
0
0
1
1
62
60
11
18
25
50 -98.44 18.75
51 -95.31 29.69
280.8
287.3
1
1
0
0
62
60
11
18
5
10
20
92.19 -37.50
112.1
0
1
58
23
13
26
52 -92.19 37.50
292.1
1
0
58
23
21
87.50 -46.88
118.2
0
1
55
29
53 -87.50 46.88
298.2
1
0
55
29
11
22
23
82.81 -56.25
76.56 -64.06
124.2
129.9
0
0
1
1
52
48
35
40
27
54 -82.81 56.25
55 -76.56 64.06
304.2
309.9
1
1
0
0
52
48
35
40
1
3
6
12
24
70.31 -70.31
135.0
0
1
44
44
3
7
14
28
56 -70.31 70.31
315.0
1
0
44
44
25
64.06 -76.56
140.1
0
1
40
48
57 -64.06 76.56
320.1
1
0
40
48
13
26
27
56.25 -82.81
46.88 -87.50
145.8
151.8
0
0
1
1
35
29
52
55
29
58 -56.25 82.81
59 -46.88 87.50
325.8
331.8
1
1
0
0
35
29
52
55
7
14
28
37.50 -92.19
157.9
0
1
23
58
15
30
60 -37.50 92.19
337.9
1
0
23
58
29
29.69 -95.31
162.7
0
1
18
60
61 -29.69 95.31
342.7
1
0
18
60
15
30
31
18.75 -98.44
9.38 -100.00
169.2
174.6
0
0
1
1
11
5
62
63
31
62 -18.75 98.44
63 -9.38 100.00
349.2
354.6
1
1
0
0
11
5
62
63
4
8
16
32
0.00 -100.00
180.0
0
1
0
63
0
0
0
0
0.00 100.00
0.0
0
0
0
63
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
28
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