Read Sony CDX-A251C Service Manual online
34
CDX-A251C
• IC Pin Descriptions
IC3 MB90486BPFV-G-177E1 (CD SYSTEM CONTROL) (SERVO BOARD (2/2))
Pin No.
Pin Name
I/O
Pin Description
1
CDON_1500MV
O
Servo 1.5 V power supply control signal output
2 to 5
NC
O
Not used. (Open)
6
DRVON
O
Motor drive mute signal output
7
CD_BUS0
I/O
Bus data input/output 0
8
CD_BUS1
I/O
Bus data input/output 1
9
VSS
—
Ground
10
CD_BUS2
I/O
Bus data input/output 2
11
CD_BUS3
I/O
Bus data input/output 3
12
CD_BUCK
O
Bus clock signal output
13
CD_XCCE
O
Chip enable signal output
14
CD_XRST
O
Reset signal output
15
CD_ZDET
I
Zero detection signal input
16 to 20
NC
O
Not used. (Open)
21
VCC
—
Power supply pin (+3.3 V)
22
DAC_ZDETL
I
Zero data detection signal input (L-ch) (Fixed at L in this set)
23
DAC_ZDETR
I
Zero data detection signal input (R-ch) (Fixed at L in this set)
24
NC
O
Not used. (Open)
25
RXD
I
UART RXD data input (MCBUS/flash data input)
26
TXD
O
UART TXD data output (MCBUS/flash data output)
27
DEC_SSTBY
O
SRAM standby mode control signal output
28, 29
NC
O
Not used. (Open)
30
DEC_INT
I
Request signal input
31, 32
NC
O
Not used. (Open)
33
AVCC
—
Power supply pin for A/D converter. (+3.3 V)
34
AVRH
—
External reference power supply pin for A/D converter. (+3.3 V)
35
AVSS
—
Ground for A/D converter.
36
NC
O
Not used. (Open)
37
DEC_XMUTE
O
Mute signal output (L: mute)
38, 39
NC
O
Not used. (Open)
40
VSS
—
Ground
41
NC
O
Not used. (Open)
42
MEC_LIMIT
I
Sled LIMIT in switch detection signal input
43
MEC_LOAD
O
Loading motor control signal output (Loading direction)
44
MEC_EJECT
O
Loading motor control signal output (Eject direction)
45
MEC_INSW
I
DISC IN switch detection signal input
46
MEC_DSW
I
DOWN switch detection signal input
47, 48
MD0, MD1
I
Input for operation mode designation. (Fixed at H in this set)
49
MD2
I
Input for operation mode designation. (Connect to VSS in this set)
50
BUS_ON
I
Bus on signal input (L: bus on)
51
BU_IN
I
Backup power supply detection signal input
52
NC
O
Not used. (Open)
53
MEC_SELFSW
I
SELF load position detection switch signal input
54, 55
NC
O
Not used. (Open)
56
UNISI
I
SONY-BUS data signal input
57
UNISO
O
SONY-BUS data signal output
58
UNICKI
I
SONY-BUS clock signal input
59
LINKOFF
O
Link off signal output
60
A_ATT
O
Audio attenuator signal output
Click on the first or last page to see other CDX-A251C service manuals if exist.