Sony CDX-GT730UI Service Manual page 39

• IC Pin Function Descriptions
MAIN BOARD (3/4) IC501 MB90F883AHPMC-GE1-425A (SYSTEM CONTROL)
Pin No. Pin Name
1 NOSE_SW
2 FL_ON
3 DOOR_SW
4 DOOR_IND
5 FSW_IN
6 ILL_SEL
7 I2C_SIO
8 I2C_CLK
9 RE_IN0
10 RE_IN1
11 X_IN
12 X_OUT
13 VCC5
14 VSS
15 C
16 UNI_SI
17 UNI_SO
18 UNI_SCK
19 BTU_RX
20 NCO
21 ILL_VOL
22 FLD_ON
23 ACC_IN
24 TEL_ATT
25 ATT
26 BUS_ON
27 SYSRST
28 CD_ON
29 CDM_ON
30 DAVDD
31 AVRH
32 RC_IN1
33 DAVSS
34 MD_AUDIO_SEL
35 VSM
36 SA_IN
37 NCO
38 KEY_IN0
39 RC_IN0
40 DSPL_IF
41 DSPL_RESET
42 VSS
43 KEY_ACK0
44 KEY_ACK1
45 FSW_OUT
46 DSPL_RX
47 DSPL_TX
48 NCO
49 MOD0
50 MOD1
51 MOD2
52 RESET
53 MC_RX
I/O
I Front panel detach detect signal input
O FL power supply control signal output (L: power ON)
I Front panel open detect signal input
O Door indicator control signal output
I DC-DC converter oscillation frequency count signal input
I Key illumination voltage setting signal input (L: 10.4 V)
I/O I2C bus serial data input/output
O I2C bus serial clock signal output
I Rotary encoder signal input 0
I Rotary encoder signal input 1
I Low speed operation clock signal input (32.768 kHz)
O Low speed operation clock signal output (32.768 kHz)
— Power supply pin (+3.3 V)
— Ground
— Regulator reference capacitor connecting pin
I SONY-BUS data input
O SONY-BUS data output
O SONY-BUS clock signal output
I Not used. (Fixed at L in this set)
O Not used. (Open)
Key illumination voltage select signal input (L: illumination color green/red, H: illumination
I
color blue or demo/screen saver)
O FL driver power supply ON/OFF control signal output
I Accessory power supply detect signal input
I Telephone attenuator detect signal input
O Audio mute control signal output
O BUS ON signal output
O System reset signal output
I CD mechanism servo power supply control request signal input
I CD mechanism deck power supply control request signal input
— A/D converter power supply pin (+3.3 V)
— A/D converter external reference power supply pin (+3.3 V)
I Rotary commander shift key signal input 1
— Ground for A/D converter
O CD mechanism deck audio select signal output (L: CD/USB source)
I S meter voltage detect signal input
I Electronic volume spectrum analyzer DC input
O Not used. (Open)
I Key signal input 0
I Rotary commander shift key signal input 0
O Display micon communication start-up signal output
O Display micon reset signal output
— Ground
I Key acknowledge detect signal input (Rotary commander)
I Key acknowledge detect signal input (Front panel)
O DC-DC converter oscillation frequency select signal output
I Display micon communication RX input
O Display micon communication TX output
O Not used. (Open)
I Micon operation mode setting signal input (at the fl ash writing: H)
I Micon operation mode setting signal input
I Micon operation mode setting signal input (at the fl ash writing: L)
I Micon reset signal input
I MC-BUS communication and CD mechanism deck micon communication RX input
CDX-GT730UI/GT737UI/GT780UI
Description
39