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SECTION 6
EXPLANATION OF IC TERMINALS
IC501 ASD042 (SYSTEM CONTROL /FL DRIVE)
1-7
GR1-7
O
FL grid signal output.
8
V
DD
–
+5V
9, 10
LED9, 10
O
LED drive signal open.
11
KEY SELECT
O
Not used. (Open)
12
VOL IN B
I
Volume encoder signal input.
13
REQ. GM
I/O
Request signal from/ to master control.
14
CLK MG
I
Serial clock input.
15
DATA GM
O
Serial data output.
16
DATA MG
I
Serial data input.
17
RESET
I
Reset signal input.
18
PANEL SW
I
CD door open detection input. Not used. (Open)
19
LED SELECT
O
LED select signal output.
20
AV
SS
–
Ground.
21-24
SPEANA IN1-4
I
Spectram analizer signal input. Not used (Ground)
25-28
KEY IN 1-4
I
Key matrix input.
29
AV
DD
–
+5V.
30
AVREF
–
31
JOG IN B
I
Not used. (Ground)
32
XT2
I
Not used. (Open)
33
V
SS
–
Ground.
34
X1
I
X’tal (5MHz)
35
X2
O
36, 37
LED7, 8
O
LED drive signal output.
38, 39
LED5, 6
O
Not used. (Open)
40-43
LED1-4
O
LED drive signal output.
44
VOL IN A
I
Volume encoder signal input.
45
JOG IN A
I
Not used. (Ground)
46
RDY MG
I
RDY signal from master control.
47
SIRCS IN
I
SIRCS signal input.
48
IC (VPP)
–
Ground connection.
49-51
LEDS11-13
O
LED drive signal output.
52
V
DD
–
Not used.
53-70
SEG5-22
O
FL segment signal output.
71
V. LOAD
–
–25V for FL
72-75
SEG1-4
O
FL segment signal output.
76-80
GR8-12
O
FL grid signal output
r
Abbreviation
FL : FLUORESCENT INDICATOR TUBE
Pin No.
Pin name
I/O
Description
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