2-Phase Stepper Motor Bipolar Driver ICs (2-Phase/1-2 Phase/W1-2 Phase Excitation)
UDN2916B/LB
qMICROSTEPPING
(1/8 STEP) CONTROL SEQUENCE
Varying the V
REF
terminal voltage in steps provides 1/8
Control sequence (microstepping)
Sequence
No.
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
Phase A
V
REF1
(V)
I
11
7.5
0
7.4
0
6.9
0
6.2
0
5.3
0
4.2
0
2.9
0
1.5
0
1.5
1
1.5
0
2.9
0
4.2
0
5.3
0
6.2
0
6.9
0
7.4
0
7.5
0
7.4
0
6.9
0
6.2
0
5.3
0
4.2
0
2.9
0
1.5
0
1.5
1
1.5
0
2.9
0
4.2
0
5.3
0
6.2
0
6.9
0
7.4
0
microstepping and reduces motor vibration greatly. The
microstepping control sequence is as follows:
PH
1
0
0
0
0
0
0
0
0
X
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
X
0
0
0
0
0
0
0
I
01
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
Current ratio (%)
100
98
92
83
71
56
38
20
0
20
38
56
71
83
92
98
100
98
92
83
71
56
38
20
0
20
38
56
71
83
92
98
PH
2
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
X
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Phase B
V
REF2
(V)
I
12
1.5
1
1.5
0
2.9
0
4.2
0
5.3
0
6.2
0
6.9
0
7.4
0
7.5
0
7.4
0
6.9
0
6.2
0
5.3
0
4.2
0
2.9
0
1.5
0
1.5
1
1.5
0
2.9
0
4.2
0
5.3
0
6.2
0
6.9
0
7.4
0
7.5
0
7.4
0
6.9
0
6.2
0
5.3
0
4.2
0
2.9
0
1.5
0
I
02
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Current ratio (%)
0
20
38
56
71
83
92
98
100
98
92
83
71
56
38
20
0
20
38
56
71
83
92
98
100
98
92
83
71
56
38
20
Note: The V
REF
terminal voltage cannot be set to 0 V. To make the output current ratio 0%, set I
0X
=I
1X
=1.
When the sequence is 0, 8, 16, or 24, power-down can be set as follows:
I
11
=1, I
01
=0: Sequence No. 0 or 16
I
12
=1, I
02
=0: Sequence No. 8 or 24
qV
REF
terminal
V
REF
is the reference voltage input terminal for PWM constant
current control. To realize stable ensure a stable signal, make
sure noise is not applied to the terminal.
qV
BB
terminal
To prevent voltage spikes on the load power supply terminal
(V
BB
), connect a large capacitor (≥22
µ
F) between the V
BB
termi-
nal and ground as close to the device as possible. Make sure
the load supply voltage does not exceed 45 V.
qThermal
protection
Thermal protection circuitry turns OFF all drivers when the junc-
tion temperature reaches +170°C. It is only intended to protect
the device from failures due to excessive junction temperature
and should not imply that output short circuits are permitted.
The output drivers are re-enabled when the junction tempera-
ture cools to +145°C.
82
UDN2916B/LB
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