Kenwood KDC-BT7539U Service Manual page 9

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