Sony CDX-GT170S Service Manual page 27

• IC PIN DESCRIPTIONS
• IC501 MB90F045PF-G-9065-SPE1 (SYSTEM CONTROL) (MAIN BOARD (3/4))
Pin No. Pin Name
1 AREASEL0
2 AREASEL1
3 AREASEL2
4 AREASEL3
5 BEEP
6 CYRIL_SEL
7 NOSE_SW
8 DIAG
9 VOLATT
10 NCO
11 VSS
12 TUATT
13 NSMASK
14 to 22 NCO
23 VCC5
24 EEP_SIO
25 EEP_CKO
26 AMPSTB
27 LCD_CE
28 LCD_SO
29 LCD_CKO
30 RDS ON
31 RE-IN0
32 RE-IN1
33 I2C_CKO
34 I2C_SIO
35 DAVDD
36 AVRH
37 DAVSS
38 QUALITY
39 VSM
40 KEYIN1
41 KEYIN0
42 VSS
43 RC_IN0
44 to 48 NCO
49 MD0
50 MD1
51 MD2
52 KEYACK
53 TU_ATTIN
54 BUIN
55 NCO
56 DAVN
57 NCO
58 UNISI
59 UNISO
60 UNISCK
I/O
I Destination function setting pin 0
I Destination function setting pin 1
I Destination function setting pin 2
I Destination function setting pin 3
O BEEP signal output to power amplifier
I Cyril correspondence discrimination signal input
I Front panel attachment detect signal input
I Status signal input from power amplifier
O Electronic volume attenuate control signal output
O Not used. (Open)
— Ground pin
O Tuner mute control signal output
O Noise mask signal output
O Not used. (Open)
— Power supply pin (+3.3V)
I/O EEPROM bus serial data signal input/output
O EEPROM bus serial clock signal output
O Stand-by signal output to power requlation
O Chip enable signal output to LCD driver
O Serial data signal output to LCD driver
O Serial clock signal output to LCD driver
O RDS (radio data system) ON signal output
I Rotary encoder signal input 0
I Rotary encoder signal input 1
O I2C bus serial clock signal output
I/O I2C bus serial data signal input/output
— A/D converter power supply pin (+3.3V)
— A/D converter external reference power supply pin (+3.3V)
— A/D converter Ground pin
I Noise detect signal input
I S-meter voltage detect signal input
I Key signal input 1
I Key signal input 0
— Ground pin
I Rotary commander key signal input
O Not used. (Open)
I Operation mode setting pin 0 (Pull up)
I Operation mode setting pin 1 (Pull up)
I Operation mode setting pin 2 (Pull down)
I Key acknowledgment detect signal input
I Tuner mute zero cross detect signal input
I Back-up power supply detect signal input
O Not used. (Open)
I RDS data block synchronized detect signal input
O Not used. (Open)
I S-BUS data signal input
O S-BUS data signal output
O S-BUS clock signal output
CDX-GT170/GT170S/GT270/GT270S
Pin Description
"L": No correspondence
"L": Panel on, "H": Panel off
Not used in this set. (Open)
Not used in this set. (Open)
Not used in this set. (Pull up)
Not used in this set. (Pull down)
Not used in this set. (Pull down)
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