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3-9. IC PIN FUNCTION DESCRIPTION
• IC401 µPD78042FGF-089-3B9 (DISPLAY BOARD)
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
I/O
O
O
O
O
O
O
O
—
O
O
O
O
O
O
O
O
I
I
I
—
O
O
O
O
O
I
I
I
—
—
I
—
—
—
—
O
O
O
O
O
O
O
O
I
I
I
I
—
—
—
Function
Fluorescent tube segment signal output
Fluorescent tube segment signal output
Fluorescent tube segment signal output
Fluorescent tube segment signal output
Fluorescent tube segment signal output
Fluorescent tube segment signal output
Fluorescent tube segment signal output
Power supply +5 V
Power-relay ON/OFF drive signal output H when power is on
Bridge relay drive signal output H when surround is off
Woofer relay drive signal output H when super woofer is on
Surround speaker relay ON/OFF drive signal output H when surrounded speaker is on
Front speaker relay ON/OFF drive signal output H when power is on
Headphone relay ON/OFF drive signal output H when headphone plug in is detected
Chip enable signal output. Transfer center and rear speaker data at low
Chip enable signal output. Transfer Dolby and surround data at low
Reset signal input
Power check input (Connected to ground)
PHONES jack in detection pin
Ground
Mute control output Low for IC-muting
Chip enable signal output Transfer data at 4 bit low and 8 bit high
Chip enable signal output Transfer IC address at low, data at high
Serial clock output
Serial data output
Destination discrimination pin (Connected to reference voltage)
Key matrix input 2
Key matrix input 1
Power supply +5 V
Power supply +5 V
Backup signal input, monitoring the microprocessor voltage at all times
Not used
Ground
X’tal (5 MHz)
X’tal (5 MHz)
TONE LED drive signal output. ACTIVE LOW when BASS/TREBLE level
adjusting mode
CENTER LED drive signal output ACTIVE LOW when Center level adjusting mode
REAR LED drive signal output ACTIVE LOW when rear level mode
WOOFER LED drive signal output ACTIVE LOW when woofer level adjusting mode
S.W. LED drive signal output ACTIVE LOW when super woofer is on
DOLBY LED drive signal output ACTIVE LOW when surround Dolby or sound
field mode is selected
HALL LED drive signal output ACTIVE LOW when surround hall or surround field
classic is selected
SIMULATED LED drive signal output ACTIVE LOW when surround SIMU or
surround field game is selected
Volume encoder signal input
Volume encoder signal input
Protect signal input
SIRCS signal input
Ground
Ground
Ground
Pin Name
DIG 2
DIG 3
DIG 4
DIG 5
DIG 6
DIG 7
DIG 8
+5 V
POWER-RY
BRIDGE. RY
WOOFER RELAY
SURR. RY
FRONT. RY
HP. RY
LV1041. CE1
LV1041. CE2
RESET
P. CHECK
HP. SW
AVSS
IC. MUTE
LC7822. CE
LC75373. CE
CLOCK
DATA
VERSION
KEY. 2
KEY. 1
AVDD
AV. REF
BACKUP
XT 2
VSS
X 1
X 2
TONE LED
CENTER LED
REAR LED
WOOFER LED
S.W. LED
DOLBY LED
HALL LED
SIMULATED LED
VOL. B
VOL. A
PROTECT
SIRCS
VSS
GND
GND
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