– 36 –
4-15.
IC PIN FUNCTION DESCRIPTION
•
DISPLAY BOARD IC201
µ
PD78045FGF-082-3B9 (SYSTEM CONTROLLER, FL DRIVER)
Pin No.
Pin Name
I/O
Description
1 to 7
DIG7 to DIG1
O
Digit drive signal output to the fluorescent indicator tube (FL201)
8
VDD
—
Power supply terminal (+5V)
9
S.CLK
O
Serial data transfer clock signal output to the dolby surround pro-logic circuit (IC300, 301),
LC78212 (IC401) and PLL IC on FM/AM tuner pack “L” active
10
S.DATA
O
Serial data output to the dolby surround pro-logic circuit (IC300, 301), LC78212 (IC401) and
PLL IC on FM/AM tuner pack “L” active
11
PLL.DATA
I
Serial data input from the PLL IC on FM/AM tuner pack “L” active
12
S.CE (LC7822)
O
Serial chip enable signal output to the LC78212 (IC401), PLL IC on FM/AM tuner pack
“H” active
13
S.CE (LV1018)
O
Serial chip enable signal output to the dolby surround pro-logic circuit (IC300, 301)
“L” active
14
REAR-RLY
O
Speaker protect relay drive signal output for the rear side speaker “H”: relay on
Not used (open)
15
BRIDGE-RLY
O
Bridgeable relay drive signal output terminal “H”: relay on
16
PROTECT
I
Over load detect signal input from the protect circuit “L”: protect detect
17
RESET
I
System reset signal input from the reset signal generator (IC950, Q201) “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
18
AUTO-STOP
I
Tuned display detection signal input from the FM/AM tuner pack “L”: tuned
19
STEREO-IN
I
Stereo detection signal input from the FM/AM tuner pack “L”: stereo
20
AVSS
—
Ground terminal (for A/D converter analog system)
21
SP-RLY
O
Speaker protect relay drive signal output for the front side speaker “H”: relay on
22
SURR-RLY
O
Speaker protect relay drive signal output for the surround speaker “H”: relay on
23
POWER-RLY
O
Relay drive signal output for the power on/off control “H”: relay on
24
SIGNAL
I
FM and AM signal meter voltage detection signal input from the FM/AM tuner pack
25
A/D-4
I
Key input terminal (A/D input) S234 to S244 (SET UP, NAME, ENTER, +, –, EFFECT/
DELAY, CENTER, REAR, MODE +, SOUND FIELD ON/OFF, MODE –) keys input
26
A/D-3
I
Key input terminal (A/D input) S222 to S226, S220, S229 to S231 (BASS BOOST, MUTING,
SHIFT, 0, MEMORY, CD, MD/TAPE, TV/LD, RDS PTY) keys input
27
A/D-2
I
Key input terminal (A/D input) S211 to S219, S227 (FM/AM, 6, 5, 4, 7, 8, 9, FM MODE,
VIDEO, TUNER) keys input
28
A/D-1
I
Key input terminal (A/D input) S201 to S210 (DISPLAY, RDS EON, 3, 2, 1, TUNING –/+,
PRESET/PTY SELECT –/+, DIRECT) keys input
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
RDS DATA IN
I
RDS data input from the RDS decoder (IC1)
32
OPEN
—
Not used (open)
33
GND
—
Ground terminal
34
X1
I
Main system clock input terminal (4.19 MHz)
35
X2
O
Main system clock output terminal (4.19 MHz)
36
WOOFER-RLY
O
Relay drive signal output for the woofer speaker “H”: relay on Not used (open)
37
LED SELECT
O
LED select signal output terminal “H” active
38
PROLOGIC LED
O
LED drive signal output terminal “H”: LED on Not used (open)
39
C.STUDIO LED
O
LED drive signal output of the CINEMA (D231) indicator “H”: LED on
40
HALL LED
O
LED drive signal output of the MUSIC (D232) indicator “H”: LED on
41
ENTER LED
I
Not used (fixed at “L”)
42
VOL DOWN
O
Motor drive signal (volume down direction) output to the volume motor drive (IC202)
“H” active
