Sony CDX-GT121 Service Manual page 27

• IC PIN DESCRIPTIONS
• IC501 MB90F045PF-G-9065-SPE2 (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-GT121/GT220/GT222
Pin Description
"L": No correspondence
"L": Panel on, "H": Panel off
Not used in this set. (Pull up)
27