Read Sony CDX-GT373A Service Manual online
CDX-GT373A
27
• IC Pin Function Description
MAIN BOARD IC501 MB90F045PF-G-9074-SPE1 (SYSTEM CONTROL)
MAIN BOARD IC501 MB90F045PF-G-9074-SPE1 (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Description
1
AREASEL0
I
Destination function setting pin 0
2
AREASEL1
I
Destination function setting pin 1
3
AREASEL2
I
Destination function setting pin 2
4
AREASEL3
I
Destination function setting pin 3
5
BEEP
O
BEEP signal output to power amplifi er
6
NCO
O
Not used. (Open)
7
DIAG
I
Status signal input from power amplifi er
8
AMPSTB
O
Stand-by signal output to power requlation
9
VOLATT
O
Electronic volume attenuate control signal output
10
NCO
O
Not used. (Open)
11
VSS
—
Ground pin
12
TUATT
O
Tuner mute control signal output
13
NSMASK
O
Noise mask signal output Not used in this set. (Open)
14
NCO
O
Not used in this set. (Open)
15
NCO
O
Not used in this set. (Open)
16
ILLUMI SEL
I
Illumination voltage setting signal input “H”: 10.4 V, “L”: 9.0 V
17
DIM_SEL
I
Dimmer select signal input “H”: No dimmer, “L”: Dimmer
18 to 20
NCO
O
Not used. (Open)
21
COL_SEL
I
Illumination color select signal input
“H”: Two colors selection/initial slave, amber, “L”: Color/slave, amber
“H”: Two colors selection/initial slave, amber, “L”: Color/slave, amber
22
B OUT SEL
I
Black out with/without discrimination select signal input “H”: Black out
23
VCC5
—
Power supply pin (+3.3V)
24
EEP_SIO
I/O
EEPROM bus serial data signal input/output
25
EEP_CKO
O
EEPROM bus serial clock signal output
26
RDS ON
O
RDS (radio data system) ON signal output Not used in this set. (Open)
27
LCD_CE
O
Chip enable signal output to LCD driver
28
LCD_SO
O
Serial data signal output to LCD driver
29
LCD_SCK
O
Serial clock signal output to LCD driver
30
NCO
O
Not used. (Open)
31
RE-IN0
I
Rotary encoder signal input 0
32
RE-IN1
I
Rotary encoder signal input 1
33
I2C_SCK
O
I2C bus serial clock signal output
34
I2C_SIO
I/O
I2C bus serial data signal input/output
35
DAVDD
—
A/D converter power supply pin (+3.3V)
36
AVRH
—
A/D converter external reference power supply pin (+3.3V)
37
DAVSS
—
A/D converter Ground pin
38
QUALITY
I
Noise detect signal input
39
VSM
I
S-meter voltage detect signal input
40
KEYIN1
I
Key signal input 1
41
KEYIN0
I
Key signal input 0
42
VSS
—
Ground pin
43
RC_IN0
I
Rotary commander key signal input Not used in this set. (Pull up)
44, 45
NCO
O
Not used. (Open)
46
LED_RED
O
Security-LED (Red) operation signal output
47
SECURITY_LED
I
Security detect signal input
48
AD_ON
O
A/D converter power supply control signal output
49
MD0
I
Operation mode setting pin 0 (Pull up)
50
MD1
I
Operation mode setting pin 1 (Pull up)
51
MD2
I
Operation mode setting pin 2 (Pull down)
52
KEYACK
I
Key acknowledgment detect signal input
53
TU_ATTIN
I
Tuner mute zero cross detect signal input Not used in this set. (Pull down)
54
BUIN
I
Back-up power supply detect signal input
55
NCO
O
Not used. (Open)
56
DAVN
I
RDS data block synchronized detect signal input Not used in this set. (Pull down)
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