Kenwood KDC-MP442U Service Manual page 7

MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name I/O
42 ROTARY CCW I
43 NC -
44 VFD CS O
45 BT RST O
46 VFD INT I
47 NC -
48 PON PANEL I/O Panel 5V power supply control
49 PON O
50 CD DISC12 SW I
51 CD LOS SW I
52 MECHA STOP O
52 CD PON O
53 CD MUTE I
54 S MECHA REQ I
55 MECHA RST O
56 SRAMSTBY O
56 NC -
CD LOE LIM
57 I
SW
58 S SYS REQ O
58 MDSP CE O
59 PON ILL O
60 VCC2 -
61 DRV MUTE O
62 VSS -
63 TYPE 1 I
64 TYPE 2 I
65 NC -
66 CD LOEJ I/O CD motor control
67 CD MOTOR O
68~70 NC -
71 ILLUMI DET I
72 ACC DET I
73 BU DET I
74 ANT CON O
75 PCON O
76 PWIC SVR O
77 PWIC MUTE O
78 PWIC STBY O
79 LINE MUTE I
Application
VOL key detection (Counterclockwise)
Not used
VFD control request
Bluetooth module reset
VFD-INT input
Not used
Power supply control
12cm disc detection
CD loading detection
SOC (System On Chip) stop
CD mechanism power supply control
CD Mute request
Communication request from mechanism to system
μ-COM
SOC (System On Chip) reset
Decoder SRAM standby control
Not used
CD detection (Chucking SW)
Communication request from system μ-COM to
mechanism
Mechanism chip enable
Key illumination power supply control
CD motor driver mute output
Destination SW
Destination SW
Not used
CD motor control
Not used
Dimmer illumination detection
ACC power supply detection
Momentary power-down detection
Power antenna control
External power amplifi er control
Power IC SVR discharge circuit control
Power IC mute control
Power IC standby control
Line mute detection
KDC-MP442U/MP6043U
/W5544U/W5644UY/X493
Truth Value
Processing / Operation / Description
Table
Detects pulse width
TDF: 15-pulse/360°, 2-click/1-pulse
Output L fi xed
H: Possible to transfer VFD data
L: Normal, H: Bluetooth reset
Output L fi xed
ON (For 11 minutes after ACC OFF): L
Momentary power-down or panel detached
or 11 minutes after ACC OFF: Hi-Z
H: Power supply ON, L: Power supply OFF
H: Normal, L: SOC stopped
H: ON, L: OFF
L: Mute request, H: Normal
H: Normal, L: Reset
H: SRAM standby
Output L fi xed
H: Loading completed, L: No disc
H: Power supply ON, L: Power supply OFF
Output L fi xed
q Refer to the truth value table
q Refer to the truth value table
Output L fi xed
L: ON, H: OFF
ACC found: L, No ACC: H
BU found: L, Momentary power down: H
Tuner ON: H
H: ON, L: OFF
TEL mute: Below 1V, NAVI mute: Over 2.5V
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