9
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No.
Pin Name
I/O
Application
Truth
value table
Processing Operation Description
79
LX_REQ_M
O
Communication request to slave unit
79
NC
O
Not used (Models not-supporting LX-BUS)
Output is
fi
xed to L
80
LX_MUTE
I
Mute request from slave unit
H: Mute ON, L: Mute OFF
80
NC
O
Not used (Models not-supporting LX-BUS)
Output is
fi
xed to L
81
LX_CON
O
Start-up request to slave unit
H: Slave unit ON, L: Slave unit OFF
81
NC
O
Not used (Models not-supporting LX-BUS)
Output is
fi
xed to L
82
LX_RST
O
Hardware-reset to slave unit
H: Reset, L: Normal
82
NC
O
Not used (Models not-supporting LX-BUS)
Output is
fi
xed to L
83
MUTE_PRE_FR
O
External PREOUT_MUTE F/R
0bit, “L” during momentary power down
84
MUTE_PRE_SW
O
External PREOUT_MUTE SUB
MUTE_2 shock noise measure
0bit, “L” during momentary power down
Use in addition to MUTE_2.
85
PON_AM
I/O AM+B power supply control terminal
H: ON when receiving AM, Hi-Z: OFF in other cases
86
TUN_IFC_OUT
I
F/E IFC OUT input terminal
H: Station found, L: Station not found
87
TUN_SMETER
I
S meter voltage detection terminal
88
RDS_NOISE
I
FM noise voltage detection terminal
88
NC
O
Not used (Models without RDS)
Output is
fi
xed to L
89
RDS_AFS_M
I/O
Time constant switching when noise is
detected
L: During AF search, Hi-Z: In normal condition
89
NC
O
Not used (Models without RDS)
Output is
fi
xed to L
90
TYPE_1
I
A/D 5 patterns
q
Refer to “Destination table”
90
NC
O
Not used (Models without USB)
Output is
fi
xed to L
91
TYPE_2
I
A/D 5 patterns
q
Refer to “Destination table”
91
NC
O
Not used (Models without USB)
Output is
fi
xed to L
92,93 NC
O
Not used
Output is
fi
xed to L
94
AVSS
-
95
NC
O
Not used
Output is
fi
xed to L
96
VREF
-
97
AVCC
-
98
LX_DATA_S
I
Data from slave unit
98
NC
O
Not used (Models not-supporting LX-BUS)
Output is
fi
xed to L
99
LX_DATA_M
O
Data to slave unit
99
NC
O
Not used (Models not-supporting LX-BUS)
Output is
fi
xed to L
100
LX_CLK
I/O LX BUS clock
100
NC
O
Not used (Models not-supporting LX-BUS)
Output is
fi
xed to L
Truth value table
q
Destination setting
Model name
Type1
90
Type2
91
Type1 (90)
Type2 (91)
Features
Pull up
Pull down
Pull up
Pull down
R645
R644
R643
R642
KDC-BT838U
1
1
×
22k
×
22k
BT
BLUE
KDC-BT8041U
1
5
×
22k
22k
×
BT
BLUE
KDC-BT8141UY
1
4
×
22k
22k
47k
BT
BLUE
KDC-BT7539U
1
2
×
22k
47k
22k
BT
BLUE
