Ic Pin Function Description - Sony TA-AV581 Service Manual

3-9. IC PIN FUNCTION DESCRIPTION

• IC401 µPD78042FGF-089-3B9 (DISPLAY BOARD)
Pin No. Pin Name
1 DIG 2
2 DIG 3
3 DIG 4
4 DIG 5
5 DIG 6
6 DIG 7
7 DIG 8
8 +5 V
9 POWER-RY
10 BRIDGE. RY
11 WOOFER RELAY
12 SURR. RY
13 FRONT. RY
14 HP. RY
15 LV1041. CE1
16 LV1041. CE2
17 RESET
18 P. CHECK
19 HP. SW
20 AVSS
21 IC. MUTE
22 LC7822. CE
23 LC75373. CE
24 CLOCK
25 DATA
26 VERSION
27 KEY. 2
28 KEY. 1
29 AVDD
30 AV. REF
31 BACKUP
32 XT 2
33 VSS
34 X 1
35 X 2
36 TONE LED
37 CENTER LED
38 REAR LED
39 WOOFER LED
40 S.W. LED
41 DOLBY LED
42 HALL LED
43 SIMULATED LED
44 VOL. B
45 VOL. A
46 PROTECT
47 SIRCS
48 VSS
49 GND
50 GND
I/O
O Fluorescent tube segment signal output
O Fluorescent tube segment signal output
O Fluorescent tube segment signal output
O Fluorescent tube segment signal output
O Fluorescent tube segment signal output
O Fluorescent tube segment signal output
O Fluorescent tube segment signal output
— Power supply +5 V
O Power-relay ON/OFF drive signal output H when power is on
O Bridge relay drive signal output H when surround is off
O Woofer relay drive signal output H when super woofer is on
O Surround speaker relay ON/OFF drive signal output H when surrounded speaker is on
O Front speaker relay ON/OFF drive signal output H when power is on
O Headphone relay ON/OFF drive signal output H when headphone plug in is detected
O Chip enable signal output. Transfer center and rear speaker data at low
O Chip enable signal output. Transfer Dolby and surround data at low
I Reset signal input
I Power check input (Connected to ground)
I PHONES jack in detection pin
— Ground
O Mute control output Low for IC-muting
O Chip enable signal output Transfer data at 4 bit low and 8 bit high
O Chip enable signal output Transfer IC address at low, data at high
O Serial clock output
O Serial data output
I Destination discrimination pin (Connected to reference voltage)
I Key matrix input 2
I Key matrix input 1
— Power supply +5 V
— Power supply +5 V
I 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
O
adjusting mode
O CENTER LED drive signal output ACTIVE LOW when Center level adjusting mode
O REAR LED drive signal output ACTIVE LOW when rear level mode
O WOOFER LED drive signal output ACTIVE LOW when woofer level adjusting mode
O 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
O
field mode is selected
HALL LED drive signal output ACTIVE LOW when surround hall or surround field
O
classic is selected
SIMULATED LED drive signal output ACTIVE LOW when surround SIMU or
O
surround field game is selected
I Volume encoder signal input
I Volume encoder signal input
I Protect signal input
I SIRCS signal input
— Ground
— Ground
— Ground
— 19 —
Function