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Pin No.
Pin Name
43
AVRH
44
AVRL
45
AVSS
46
KEY-IN0
47
KEY-IN1
48
KEY-IN2
49
RC-IN0
50
D-BASS IN
51
QUALITY
52
MPDH (MTP)
S-METER
53
(VSM)
54
VCC
55
AMP ATT
56
AMP ON
57
ILL IN
58
LOCK IN
59
EMPH ON
60
AU ATT
61
AF ATT
62
TU-ATT
63
VSS
64
ACC IN
65
AF-SEEK
66
WIDE
67
DAVN
68
NARROW
69
SSTOP
70
SDA
71
SCL
72
RC-IN1
73
X1A
I/O
I
Reference voltage (+5V) input terminal (for A/D converter)
I
Reference voltage (0V) input terminal (for A/D converter)
—
Ground terminal (for A/D converter)
Key input terminal (A/D input) (LSW531, LSW532, S502, LSW533 to LSW538)
I
OFF, SOURCE, SEEK/AMS + ) + = 0 – , DSPL, SOUND, MODE, SHIFT, 1, 2
keys input (LSW533 DSPL: MDX-C7970R only)
Key input terminal (A/D input) (LSW890, LSW512 to LSW521)
I
6, AF/TA (MDX-C7970R) LIST (MDX-C7970), LIST PTY (MDX-C7970R) DSPL (MDX-
C7970), 10 to 3 keys input
I
Key input terminal (A/D input) Not used (fixed at "L")
I
Rotary remote commander key input terminal (A/D input)
I
D-BASS switch (S501) input terminal (A/D input)
Noise level detection signal input at SEEK mode (A/D input)
I
Used for the MDX-C7970R only (MDX-C7970: Not used (open))
Multi-path detection signal input from the RDS decoder (IC102) (A/D input)
I
Used for the MDX-C7970R only (MDX-C7970: Not used (open))
FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU1)
I
(A/D input)
—
Power supply terminal (+5V)
Power amp muting on/off control signal output to the power amplifier (IC500)
O
"L": muting on
Standby on/off control signal output to the power amplifier (IC500)
O
"L": standby mode, "H": amp on
Auto dimmer control illumination line detection signal input terminal
I
"L" is input at dimmer detection
I
Mini-disc lock detection signal input from the MD mechanism controller (IC501) "H": lock
O
Emphasis control signal output terminal Not used (open)
O
Audio line muting on/off control signal output terminal "H": muting on
O
Preamp muting on/off control signal output to the electrical volume (IC300) "H": muting on
Muting on/off control signal output of the FM tuner signal "H": muting on
O
Used for the MDX-C7970R only (MDX-C7970: Not used (open))
—
Ground terminal
I
Accessory detect signal input terminal "L": accessory on
PLL low-pass filter time constant selection signal output at AF SEEK
O
"H" is output when AF SEEK Not used (open)
IF band select signal output terminal "H": wide mode
In receiving FM signals, interference noise from adjacent stations is removed by narrowing the
O
IF band automatically in the tuner unit so as to raise the selectivity, but in this case, the distortion
may increase and accordingly, the IF band is widened forcibly
Used for the MDX-C7970R only (MDX-C7970: Not used (open))
Data transmit completed detect signal input from the RDS decoder (IC102) "H" active
I
Used for the MDX-C7970R only (MDX-C7970: Not used (open))
Narrow select signal output terminal "H" active
O
Used for the MDX-C7970R only (MDX-C7970: Not used (open))
I
IF counter request signal input from the FM/AM PLL (IC100)
Two-way data bus with the FM/AM PLL (IC100), RDS decoder (IC102) and electrical volume
I/O
(IC300) (RDS decoder is MDX-C7970R only)
Bus clock signal output to the FM/AM PLL (IC100), RDS decoder (IC102) and electrical volume
O
(IC300) (RDS decoder is MDX-C7970R only)
I
Rotary remote commander shift key input terminal "L": shift
O
Sub system clock output terminal (32.768 kHz)
Function
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