28
6-13.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC501 MB90574BPMT-G-267-BND (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
TU-ON
O
Tuner system power supply on/off control signal output to the BA4908 (IC671)
“H”: tuner power on
2
ANT CUT
O
Tuner system power supply on/off control signal output terminal “H”: tuner power on
Not used (open)
3
BUS-ON
O
Bus on/off control signal output to the SONY bus interface (IC701) “L”: bus on
Used for the XR-C5300RV,not used (open) for the XR-4300RV
4 to 6
NCO
O
Not used (open)
7
ILL-ON
O
Power on/off control signal output of the illumination LED and liquid crystal display driver
(IC901) “H”: power on
8
VCC
—
Power supply terminal (+5V)
9
E2P SIO
I/O
Two-way data bus with the FM/AM tuner unit (TU1)
10
E2P CKO
I/O
Two-way data bus with the FM/AM tuner unit (TU1)
11
SYSRST
O
Reset signal output to the SONY bus interface (IC701) “L”: reset
Used for the XR-C5300RV,not used (open) for the XR-4300RV
12
DOORSW
I
Front panel open/close detection signal input “L” is input when the front panel is closed
13
LCD SO
O
Serial data output to the liquid crystal display driver (IC901)
14
LCD CKO
O
Serial data transfer clock signal output to the liquid crystal display driver (IC901)
15
LCD CE
O
Chip enable signal output to the liquid crystal display driver (IC901) “H” active
16
BEEP
O
Beep sound drive signal output terminal
17
UNISI
I
Serial data input from the SONY bus interface (IC701)
Used for the XR-C5300RV,not used (fixed at “L”) for the XR-4300RV
18
UNISO
O
Serial data output to the SONY bus interface (IC701)
Used for the XR-C5300RV,not used (fixed at “L”) for the XR-4300RV
19
UNICKO
O
Serial data transfer clock signal output to the SONY bus interface (IC701)
Used for the XR-C5300RV,not used (fixed at “L”) for the XR-4300RV
20
UNICKI
I
Serial data transfer clock signal input from the SONY bus interface (IC701)
Used for the XR-C5300RV,not used (fixed at “L”) for the XR-4300RV
21
CD/MD
I
CD/MD selection signal input terminal Not used (fixed at “L” in this set)
22
FLASH-W
I
Internal flash memory data write mode detection signal input terminal “L”: data write mode
Not used (fixed at “H” in this set)
Sircs remote control signal input form the remote control receiver (IC951)
LED drive signal output of the door indicator (LED801) “H”: LED on
“H” is output to turn on LED when front panel is opened
IF band detection signal input terminal Not used (open)
Discharge control signal output for the noise detection circuit “H”: discharge
34
C
—
Connected to coupling capacitor for the power supply
35
AD-ON
O
A/D converter power control signal output terminal
When the KEYACK (pin
uh
) that controls reference voltage power for key A/D conversion input
is active, “L” is output from this terminal to enable the input
36
RE-IN0
I
37
RE-IN1
I
38
DVCC
—
Power supply terminal (+5V) (for D/A converter)
39
DVSS
—
Ground terminal (for D/A converter)
Dial pulse input of the rotary encoder (RE901)
(for VOLUME/BASS/TREBLE/BALANCE/FADER control)
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