MITSUBISHI <CONTROL / DRIVER IC>
M56784FP
SPINDLE MOTOR DRIVER
DESCRIPTION
The M56784FP is a semiconductor integrated circuit in order to
drive the spindle motor.
PIN CONFIGURATION (TOP VIEW)
N.C
W
V
U
R
S
MODE3
MODE4
1
2
3
4
5
6
7
8
9
42
41
40
39
38
37
36
35
34
N.C
S/S
RDS
FG
C
I
MODE2
MODE1
FEATURES
q
Large power dissipation (Power Package).
q
3.3V DSP available.
q
The supply voltage with wide range.
q
High motor drive current.
q
Low saturation voltage. (typical 1.2V at load current 500mA)
q
Motor current control for both motor torque directions.
q
Reverse torque mode select [SHORT BRAKING, etc].
q
Sleep mode. (Zero total current)
q
Hall amplifier sensitivity select.
(Minimum voltage: 35mVp-p or 50mVp-p)
q
FG signal output terminal.
q
Automatic stop select. (Removable function)
q
Reverse detected signal pin.
M56784FP
10
GND
33
32
31
30
29
28
27
26
25
24
23
22
VM
V
CC
2
EC
ECR
VCC1
HB
N.C
GND
11
12
13
14
APPLICATION
CD-ROM, DVD, DVD-ROM, DVD-RAM etc.
Hw-
Hw+
Hv-
Hv+
Hu-
Hu+
N.C
15
16
17
18
19
20
21
Outline 42P9R-D
N.C: no connection
BLOCK DIAGRAM
U
4
V
3
W
2
S/S
41
R
S
5
V
CC
1
24
VM
V
CC
2
28
-
27
++
Vref
8 to 14
MODE1
36
MODE2
37
BRAKING
MODE
CHANGE
120°
MATRIX
SENSE
TSD
I/I
Converter
GND
29 to 35
GND
MODE4
7
MODE3
FG
RDS
6
39
40
20
Hu+
19
Hu-
18
Hv+
17
Hv-
16
Hw+
15
Hw-
23
HB
C
I
38
FG
RDS
+
-
+
-
+
-
Hall
Bias
V/I Converter
26
EC
25
ECR
MITSUBISHI [ MITSUBISHI ELECTRIC SEMICONDUCTOR ]
