Read Sony CDX-CA680N Service Manual online
11
CDX-CA680N
SECTION 2
DIAGRAMS
2-1. IC PIN DESCRIPTION
• IC501 MN101C49KSE (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Pin Description
1
VREF–
—
A/D converter power supply (–) pin
2
VSM
I
S-meter voltage detection input
3
QUALITY
I
Noise detection input
4, 5
KEYIN1, 0
I
Key input 1, 0
6
RCIN0
I
Rotary commander key input
7 to 9
NIL
I
Not used. (Fixed at L in this set)
10
VREF+
—
A/D converter power supply (+) pin (+5 V)
11
VDD
—
Power supply pin (+5 V)
12
OSCOUT
O
Main clock output (18.432 MHz)
13
OSCIN
I
Main clock input (18.432 MHz)
14
VSS
—
Ground
15
XIN
I
Sub clock input (32.768 kHz)
16
XOUT
O
Sub clock output (32.768 kHz)
17
MMOD
I
Not used. (Fixed at L in this set)
18
LCDSO
O
Serial data output for LCD driver IC.
19
LCDCE
O
Chip enable output for LCD driver IC.
20
LCDCKO
O
Serial clock output for LCD driver IC.
21
CD_TSO
O
Serial data output for CD servo IC.
22
CD_TSI
I
Serial data input from CD servo IC.
23
CD_TCKO
O
Serial clock output for CD servo IC.
24
SYSRST
O
System reset output
25
BUSON
O
BUS ON output
26
KEYACK
I
Key acknowledge detection input
27
DAVN
I
RDS data block synchronization detection input
28
BUIN
I
Backup power supply input
29
SIRCS
I
SIRCS input
30
TU_ATTIN
I
Tuner attenuator control input
31
CD_PACK
I
CD text pack synchronization signal input from CD servo IC.
32
NC (VCC)
—
Power supply pin (+5 V)
33
RESET
I
Microcomputer reset input
34
NOSE-SW
I
Front panel attachment detection input
35
BEEP
O
Beep output
36
NC
O
Not used. (Open)
37
TESTIN
I
Test mode detection input
38
ACCIN
I
Accessory power supply detection input
39
NC
O
Not used. (Open)
40
TELATT
I
Telephone attenuator detection input
41
NC (VCC)
I
Not used. (Fixed at H in this set)
42
UNISO
O
SONY-BUS data output
43
UNISI
I
SONY-BUS data input
44
UNICKO
O
SONY-BUS clock output
45
I2C_SIO
I/O
I
2
C BUS serial data input/output
46
NC
O
Not used. (Open)
47
I2C_CKO
O
I
2
C BUS serial clock output
48, 49
NC
O
Not used. (Open)
50
CD_SELFSW
I
CD mechanism deck Self switch detection input
51
TSTB
O
CD text parameter strobe output for CD servo IC.
52
RFOK
I
RFOK signal input from CD servo IC.
53
CD_RST
O
Reset signal output for CD servo IC.
54
A0
O
Command/parameter discrimination signal output for CD servo IC.
55
STB
O
Data strobe signal output for CD servo IC.
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