Sony CDX-GT420U Service Manual page 34

CDX-GT420U/GT424U/GT427UE/GT470U/GT470US
Ver. 1.1
• IC Pin Function Description
MAIN BOARD IC501 M3062LFGP-050FP (SYSTEM CONTROL) (EXCEPT GT427UE)
MAIN BOARD IC501 M3062LFGP-053FP (SYSTEM CONTROL) (GT427UE)
Pin No. Pin Name
1 LCD DATA
2 LCD CLK
3 NCO
4 SIRCS
5 to 7 NCO
8 NCO (BYTE)
9 CNVSS
10 XIN
11 XOUT
12 RESET
13 OSCOUT
14 VSS
15 OSCIN
16 VCC1
17 NMI
18 DAVN
19 BUIN
20 CDM ON
21 NCO
22 Z MUTE
23 VBUSON
24 NOSE SW
25 USB OVER
26 BEEP
27 USB ON
28 SYNC OUT
29 I2C SCK
30 I2C SIO
31 MT TXD
32 MT RXD
33, 34 NCO
35 MC TX
36 MC RX
37 to 39 NCO
40 DD ON
41 NCO
42 SYSRST
43 RCIN1
44 WAKE UP
45 to 50 NCO
51 CD ON
52 NCO
53 NCO
54 TEL ATT
55 ACC IN
56 ATT
57 DIAG
58 AMPSTB
59 VOLATT
60, 61 NCO
62 VCC2
63 COL SEL
64 VSS
34
I/O
O Liquid crystal display panel serial data signal output
O Liquid crystal display panel serial clock signal output
O Not used. (Open)
I Remote control signal input
O Not used. (Open)
I Connect to ground. (Pull down)
I Flash write signal input
I Low speed operation clock signal input (32.768kHz)
O Low speed operation clock signal output (32.768kHz)
I Reset signal input
O High speed operation clock signal output (11.06MHz)
— Ground pin
I High speed operation clock signal input (11.06MHz)
— Power supply pin (+3.3V)
I External pull up pin (fi xed at "H".)
I RDS data block cycle detection signal input
I Back up power supply detection signal input
I CD mechanism deck power supply control request signal input
O Not used. (Open)
I Mute signal input
I VBUS power supply control signal input
I Front panel attachment detection signal input
I USB over current detection signal input
O Beep signal output to power amplifi er
O USB over current detection IC control signal output
O DC/DC converter oscillation frequency control signal output
O I2C serial clock signal output
I/O I2C serial data signal input/output
O Flash write interface serial data signal output
I Flash write interface serial data signal input
O Not used. (Open)
O MC-BUS communication and mechanism IC communication TX output
I MC-BUS communication and mechanism IC communication RX input
O Not used. (Open)
O DC/DC converter power supply on/off control signal output
O Not used. (Open)
O System reset signal output
I Rotary commander shift key signal input
O Mechanism IC wake up signal output
O Not used. (Open)
I CD mechanism servo power supply control request signal input
O Not used. (Open)
O Not used. (Open)
I Telephone attenuate detection signal input
I Accessory power supply detection signal input
O Audio mute control signal output
I Condition signal input from power amplifi er IC
O Standby signal output to power regulator IC
O Electrical volume attenuate control signal output
O Not used. (Open)
— Power supply pin (+3.3V)
I Key illumination two colors change setting signal input
— Ground pin
Description
Normally operation: "L", Flash write: "H"
"H": VBUS on, "L": VBUS off
"L": two colors