24
5-12.
IC PIN FUNCTION DESCRIPTION
•
DISPLAY BOARD IC501
µ
PD78043FGF-059-3B9 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1 to 7
7G to 1G
O
Gird drive signal output to the fluorescent indicator tube (FL501)
8
VDD
—
Power supply terminal (+5V)
9
POWER RY
O
Relay drive signal output for the power on/off control “H”: relay on (power on)
10
SUR CE
O
Serial chip enable signal output to the dolby surround pro-logic circuit (IC400, 401)
“H” active
11
VOL LR CE
O
Serial chip enable signal output to the LC75373ED (IC201) (for L/R-ch signal) “H” active
12
VOL CSW CE
O
Serial chip enable signal output to the LC75373ED (IC203) (for 5.1ch input center/woofer signal)
“H” active
13
VOL SR CE
O
Serial chip enable signal output to the LC75373ED (IC202) (for wireless rear speaker signal)
“H” active
14
S CLOCK
O
Serial data transfer clock signal output to the dolby surround pro-logic circuit (IC400, 401) and
LC75373ED (IC201 to IC203)
15
S DATA
O
Serial data output to the dolby surround pro-logic circuit (IC400, 401) and LC75373ED (IC201 to
IC203)
16
—
O
Not used (pull down)
17
RESET
I
System reset signal input from the reset signal generator (IC502, Q501) “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
18
SEL A
O
Input select signal output to the MC14052BCP (IC101) *1
19
SEL B
O
Input select signal output to the MC14052BCP (IC101) *1
20
AVSS
—
Ground terminal (for A/D converter)
21
LR MUTE
O
Line muting on/off control signal output for the front side speaker “L”: muting on
22
C MUTE
O
Line muting on/off control signal output for the center side speaker “L”: muting on
23
S MUTE
O
Line muting on/off control signal output for the rear side speaker “L”: muting on
24
SW MUTE
O
Line muting on/off control signal output for the sub woofer speaker “L”: muting on
25
KEY1
I
Key input terminal (A/D input)
S501 to S504 (INPUT, S.WOOFER, SURROUND, CENTER MODE keys input)
26
KEY0
I
Key input terminal (A/D input) S505, S506 (MASTER VOL +/– keys input)
27
FAN SIG IN
I
Not used (fixed at “L”)
28
AUTO SW
I
TV audio detect signal input for the auto power on/off
29
AVDD
—
Power supply terminal (+5V) (for A/D converter analog system)
30
AVREF
I
Reference voltage (+5V) input terminal (for A/D converter)
31
—
I
Not used (fixed at “L”)
32
XT2
—
Not used (fixed at “L”)
33
VSS
—
Ground terminal
34
X1
I
Main system clock input terminal (5 MHz)
35
X2
O
Main system clock output terminal (5 MHz)
36
—
O
Not used (pull down)
37
REAR POWER
O
Power on/off control signal output for the wireless rear speaker “H”: power on
38
U SET SW
I
Setting terminal for the model Fixed at “H” in this set
39, 40
—
O
Not used (pull down)
41
FAN DRIVE
O
Not used (pull down)
*1 Input select control
TV
VIDEO
AUX
OFF
SEL A (pin
!•
)
“L”
“H”
“L”
“H”
SEL B (pin
!ª
)
“L”
“L”
“H”
“H”
Terminal
Function
