A4980LP View Datasheet(PDF) - Allegro MicroSystems
Part Name
Description
MFG CO.
'A4980LP' PDF : 44 Pages View PDF
A4980
Automotive, Programmable Stepper Driver
reference value. Although the current in Q3 and Q4 for phase A is
effectively negative, the negation is provided by controlling the
direction of the current. The current control scheme still operates
using positive values.
As shown below, the table of values can be extended to include
Q3 and Q4 with the current direction indicated in the last column.
Note that the same value is now applied to four locations in the
full 360-degree electrical cycle.
Step 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Value 0 5 11 18 23 29 35 40 44 48 52 55 58 60 62 63
Q1 FWD
Step
Value
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Q2 FWD
5 11 18 23 29 35 40 44 48 52 55 58 60 62 63 63
Step 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
Value 0 5 11 18 23 29 35 40 44 48 52 55 58 60 62 63
Q3 Rev
Step
Value
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48
Q4 Rev
5 11 18 23 29 35 40 44 48 52 55 58 60 62 63 63
Shown outlined above, steps 4, 28, 36, and 60 all contain the
value 23.
The other phase, phase B, uses the same values as phase A but
shifted back by 16 Step Angle Numbers. The full distribution of
the value entered in step 4 of phase A is highlighted in figure 12
(and shown in table 7). This single value is used in a total of eight
locations. The same distribution of values applies to all the values
in steps 1 to 15. These values are defined in the A4980 as PT(0)
to PT(14), respectively.
There are two exceptions to this data distribution principal. These
are the zero value and the maximum value:
• The values in phase A steps 0 and 32 and phase B steps 16 and
48 are always set to zero and cannot be programmed.
• The maximum value, PT(15), is distributed to only two Step
Angle Numbers in each phase. These are the points in the cycle
where the peak current is required, namely phase A steps 16 and
48 and phase B steps 0 and 32.
Table 7. Phase Current Table (default, power-on content)
Step Angle Number
Phase Current Step
(% of IPMAX) Angle Phase
DAC
Step Angle Number
Phase Current Step
(% of IPMAX) 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
ABAB
0000
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 18.75 98.44 10.8 0 0 11 62
17 34 -18.75 -98.44 190.8 1 1 11 62
3 29.69 95.31 17.3 0 0 18 60
35 -29.69 -95.31 197.3 1 1 18 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 56.25 82.81 34.2 0 0 35 52
19 38 -56.25 -82.81 214.2 1 1 35 52
7 64.06 76.56 39.9 0 0 40 48
39 -64.06 -76.56 219.9 1 1 40 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 82.81 56.25 55.8 0 0 52 35
21 42 -82.81 -56.25 235.8 1 1 52 35
11 87.50 46.88 61.8 0 0 55 29
43 -87.50 -46.88 241.8 1 1 55 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 98.44 18.75 79.2 0 0 62 11
23 46 -98.44 -18.75 259.2 1 1 62 11
15 100.00 9.38 84.6 0 0 63 5
47 -100.00 -9.38 264.6 1 1 63 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 98.44 -18.75 100.8 0 1 62 11
25 50 -98.44 18.75 280.8 1 0 62 11
19 95.31 -29.69 107.3 0 1 60 18
51 -95.31 29.69 287.3 1 0 60 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 82.81 -56.25 124.2 0 1 52 35
27 54 -82.81 56.25 304.2 1 0 52 35
23 76.56 -64.06 129.9 0 1 48 40
55 -76.56 64.06 309.9 1 0 48 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 56.25 -82.81 145.8 0 1 35 52
29 58 -56.25 82.81 325.8 1 0 35 52
27 46.88 -87.50 151.8 0 1 29 55
59 -46.88 87.50 331.8 1 0 29 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 18.75 -98.44 169.2 0 1 11 62
31 62 -18.75 98.44 349.2 1 0 11 62
31 9.38 -100.00 174.6 0 1 5 63
63 -9.38 100.00 354.6 1 0 5 63
4 8 16 32 0.00 -100.00 180.0 0 1 0 63
0000
0.00 100.00 0.0 0 0 0 63
Allegro MicroSystems, Inc.
28
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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