37
Vcc2(5V)
Vcc1
Vref
PMM3501
C2
C1
C3
C4
R1
R2
1
P.GND
16~30
Stepping motor
2
3
21
11
12
13
18
14
15
16
17
20
10
19
9
27
28
7
8
1
2
4
23
6
24
5
25
Clock
Mode A
Mode B
Mode C
Hold
CW / CCW
Enable
Reset
MOI
+
+
+
Example of Application Circuit
For the R1 and R2 constants, determine the Vref voltage
according to the following equation.
Vref (V) = motor current adjustment value (A/phase) x 0.41
Notice that 100Ω is recommended for R2 due to the
configuration of the internal circuit of the PMM3101.
Place the GND side of the source by-pass capacitor of VCC1 (C1)
as close to pins 27 and 28 as possible to reduce noise.
Function of each terminal
Function of each terminal
function
Input condition for operation
Vref
Motor current setting input
–
Clock
Pulse input for motor drive
Mode C = "H": Rising edge operation
Mode C = "L": Rising edge and falling edge operation
Hold
Pause input
Hold = "L" level
CW/CCW
Motor rotational direction setting input
"H" level = CW rotation
"L" level = CCW rotation
Enable
Power off input
Enable = "L" level
Reset
System reset
Reset = "L" level
MOI
Rotation monitor output
"H" level output once for each phase current period
C1
C2
C3
C4
470µF
6.8µF
0.1µF10µF
Input
condition Energization mode
1 step angle
Basic step division
Mode A
Mode B
Mode C
(degree)
LL
H
2EX
1.2
1
LH
H
2–3EX
0.6
2
HLH
W2–3EX
0.3
4
HHH
2W2–3EX
0.15
8
HH
L
4W2–3EX
0.075
16
Energization mode table
Recommended circuit part constants
• The MOI output differs from the phase origin monitor output.
• When Mode C = "L," 1 step operation is performed for each rising edge and falling edge of the Clock pulse.
If the duty ratio of the drive pulse moves out of the adjustment significantly by 50%, operation becomes unstable.
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