MITSUBISHI <CONTROL / DRIVER IC>
M54677FP
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
The M54677FP is a semiconductor IC to drive a bipolar stepper
motor directly by controlling the coil current with the constant
current method.
PIN CONFIGURATION (TOP VIEW)
St1
C1
Vref1
1
2
3
4
5
6
7
36
35
34
33
32
31
30
St2
C2
Vref2
V
M
21
M
A
2
E2
FEATURES
qWide
output current control range (20 – 1000mA)
qBipolar
and constant current
qBuilt
in a thermal shutdown circuit
qBuilt
in flywheel diodes
V
M
11
M
A
1
E1
M54677FP
8
29
28
27
26
25
24
23
22
21
20
19
N.C
M
B
2
V
M
22
Vcc2
T2
Ph2
GND
APPLICATION
Office automation equipment such as printer, FDD, HDD, and FAX
9
GND
10
11
FUNCTION
The M54677FP can drive a stepper motor by the 2-phase bipolar
method and also control the coil current. Furthermore, it controls
the direction of the coil current by Ph input and the coil current
value by Vref pin.
Because two control circuits are built in this IC, a stepper motor
can be driven with a single IC by the 2-phase bipolar method.
12
N.C 13
M
B
1 14
V
M
12 15
Vcc1 16
T1 17
Ph1 18
Outline 36P2R-D
N.C: no connection
BLOCK DIAGRAM
VM21
VM22
VM11
36
34
19
33
32
23 22
1
3
18
4
5
MA1
14 15
VM12
Vref2
MA2
MB2
Vref1
MB1
Ph2
St2
Ph1
St1
Vcc2
21
16
current
-comp
+
–
mono-multi
current
-comp
+
–
mono-multi
–
–
+
Buffer
+
standby
-comp
31
E2
7
Buffer
25
–
standby
-comp
30
35
C2
20
T2
–
12
GND
2
C1
17
T1
6
E1
GND
Vcc1
MITSUBISHI [ MITSUBISHI ELECTRIC SEMICONDUCTOR ]
