Onkyo DV-S555, Service Manual, Page: 57 / 62

DV-S555
IC BLOCK DIAGRAM/ TERMINAL DESCRIPTION
BA6664FM (Spindle Motor Driver : IC251)
Torque
Current
sense amp
TSD
A
3
A
2
A
1
GND
H
1
H
1
H
2
H
2
H
3
H
3
Driver
Gain
control
2
4
7
8
9
10
11
12
13
14
R
D
CK
Q
Q
Gain
switch
Vcc
Vcc
Vcc
PS
Short brake
Brake mode
HALL BIAS
FIN
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1,3,5,6
NC
R
NF
VM
GSW
Vcc
FG
PS
EC
E
CR
FR
FG2
SB
C
NF
BR
V
H
Block diagram
T
L
HALL AMP
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
N.C.
A
3
N.C.
A
2
N.C.
N.C.
A
1
GND
H
1
H
1
H
2
H
2
H
3
H
3
V
H
16
17
18
19
20
21
22
23
24
25
26
27
28
FIN
BR
C
NF
SB
FG2
FR
E
CR
E
C
PS
FG
V
CC
GSW
V
M
R
NF
FIN
Pin name
Function
Pin No. Pin name Function
N.C.
Output pin
N.C.
Output pin
N.C.
N.C.
Output pin
Ground
Hall signal input pin
Hall signal input pin
Hall signal input pin
Hall signal input pin
Hall signal input pin
Hall signal input pin
Hall bias pin
Select the brake mode pin
Connect a capacitor for negative feedback
Short brake pin
FG3 signal output pin
Terminal which detects rotation
Reference control pin of output voltage
Output control pin
Power save pin
FG signal output pin
Power supply pin
Gain select pin
Power supply pin (motor)
Resistance connection pin
for output current detection
Ground pin