2-Phase Stepper Motor Unipolar Driver ICs (2W1-2 Phase Excitation/Micro-step Support)
SLA7042M/SLA7044M
sInternal
Block Diagram
OUT A
OUT A
VDD A
VDD B
OUT B
OUT B
Rs B
OFF time timer
(TOFF 3-step switching)
Chopper ON
Noise filter
(2
µ
s)
Reference voltage
Vref
b
a
c
0%
0
0
0
20%
0
1
0
40%
1
0
0
55.5%
1
1
0
71.4%
0
0
1
83%
0
1
1
91%
1
0
1
100%
1
1
1
Reference voltage
c
b
a
Vref
0
0
0
0%
0
0
1
20%
0
1
0
40%
0
1
1
55.5%
1
0
0
71.4%
1
0
1
83%
1
1
0
91%
1
1
1
100%
OFF time timer
(TOFF 3-step switching)
Chopper ON
Noise filter
(2
µ
s)
PWM
PWM
Phase
COMP
Reset
Ph.
Phase
Latch
a
b
c
c
Latch
b
a
Ph.
Reset
COMP
Reset
Shift register
Ph.
a
b
c
c
Shift register
b
a
Ph.
Reset
Enable
Enable
CLOCK A
CLOCK B
Rs A
GND A
STROBE A
STROBE B
DATA A
sOutput
Current Formula
I
O
=
K V
REF
3 R
S
K: Reference voltage setting rate by serial signal
(See the internal block diagram)
sDiagram
of Standard External Circuit
V
CC
5V
4
V
DD
A
ENABLE
V
REF
3
14
R
2
C
1
GND A GND B
7
12
C
1
: 500 to 10000pF
RS A
9
R
S
REF A
REF B
15
1
8
11
18
V
DD
B OUT A OUT A OUT B OUT B
CLOCK A 5
CLOCK B
R
1
DATA B
SLA7042M
SLA7044M
16
2
13
STROBE A
STROBE B
DATA A
6
DATA B
17
RS B
10
R
S
GND B
Ref A
Ref B
SLA7042M/SLA7044M
45
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