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AN2650 Datasheet(PDF) 10 Page - STMicroelectronics

Part # AN2650
Description  L9942 stepper motor driver for bipolar stepper motors
PDF  26 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2650 Datasheet(HTML) 10 Page - STMicroelectronics

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Shorted coil detection
AN2650
10/26
DocID14109 Rev 3
Figure 3. Stepping modes (Auto decay mode, fast decay without delay time)
Table 1 shows Phase Counter values where fast decay is active.
Table 1. Phase counter values for fast decay
Step Mode
Bridge
DIR=0
DIR=1
Full step
A
(8) (24)
(16(1)) (0(1))
B
(0) (16)
(24(1)) (8(1))
Half step
A
(8, 12) (24, 28
(20, 16(1)) (4, 0(1))
B
(0, 4) (16, 20)
(28, 24(1)) (12, 8(1))
0
8
16
24
00
88
0
88
0
0
8
16
24
0
08
8
08
8
0
Full-Step Mode, DIR=0
Full-Step Mode, DIR=1
Current
Driver A
Current
Driver B
StepCLK
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Current
Driver A
Current
Driver B
StepCLK
Phase Counter
Phase Counter
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
0
4
8
1216202428
04
4
8
0
4
84
04
4
8
0
4
84
0
4
8
12
16
20
24
28
0
4
48
0
4
48
048
4
048
4
Half-Step Mode, DIR=0
Half-Step Mode, DIR=1
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Current
Driver A
Current
Driver B
StepCLK
Current
Driver A
Current
Driver B
StepCLK
Phase Counter
Phase Counter
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
02468
10 12 14 16 18 20 22 24 26 28 30
0246
0
2
4
62
4
6
246
88
0
2
4
6
8
246
0
2
4
6
8
246
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
0
2
4
6
0246
246
2
4
68
8
02468
2
4
6
02468
2
4
6
Mini-Step Mode, DIR=0
Mini-Step Mode, DIR=1
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Current
Driver A
Current
Driver B
StepCLK
Current
Driver A
Current
Driver B
StepCLK
Phase Counter
Phase Counter
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
0123456789 10111213141516171819202122232425262728293031
01234567
0
1
2
3
4
5
6
71
2
3
4
5
6
7
1234567
88
0
1
2
3
4
5
6
7
8
12345678
0
1
2
3
4
5
6
7
1234567
0
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
0
1
2
3
4
5
6
7
01234567
1234567
1
2
3
4
5
6
78
8
012345678
1
2
3
4
5
6
7
8
01234567
1
2
3
4
5
6
7
Micro-Step Mode, DIR=0
Micro-Step Mode, DIR=1
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Fast Decay
Current
Driver A
Current
Driver B
StepCLK
Current
Driver A
Current
Driver B
StepCLK
Phase Counter
Phase Counter
HSA2
HSA1
HSB1
HSB2
HSA1
HSA2
HSB2
HSB1
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay
Slow Decay



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