Block Diagram; Components Description; Microcomputer's Terminal Description - Kenwood KCA-IP500 Service Manual

Ipod interface
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KCA-IP500
LX-BUS INTERFACE
LX REQ M
1
D GND
2
BU
3
LX CON
4
LX MUTE
5
A GND
6
LX RST
7
Rch
8
LX REQ S
9
10
LX DATA S
11
LX DATA M
Lch
12
LX CLK
13
CONTROL CIRCUIT UNIT (X29-4410-00)
Ref. No.
Application / Function
Communication control µ-com
IC1
IC2
Resetting IC
IC3
Buffer
IC4
+8.5V AVR
Q1,2
BU 5V AVR
Q3
BU detection SW
Q4
Resetting SW
Q5
Changer control SW
Q6
Changer mute SW
Q7
iPod connection detection SW

MICROCOMPUTER'S TERMINAL DESCRIPTION

MICROCOMPUTER 30302MCP070GP (IC1 : X29)
Active
Pin No.
Pin Name
(H/L)
1~5
N.C
6
BYTE
7
H
CNVSS
8,9
N.C
2

BLOCK DIAGRAM

Q1,2
Q7
BU 5V
IC4
iPod
IC3
CHARGE SW
Q3
IC1
BU DET
LX-BUS
SYSTEM
COMMUNICATION
u-COM
E2PROM
12.5MHz

COMPONENTS DESCRIPTION

iPod commands and LX-BUS commands are inter-converted.
When voltage of BU 5V decreases to 3.6V or less, Lo is output.
3.3V → 5V level shifter buffer
iPod re-charging DC/DC converter power supply.
When BU is impressed, 5V is output. Q1 and Q2 are inverted darlington connected.
When momentary power down and BU are detected, base is turned to Lo and Q3 goes off.
When system reset is turned on, base becomes Hi and Q4 is turned on.
When in CH CON or CH CON2 modes, base is turned to Hi and Q5 is turned on.
When mute request is output to H/U, base is turned to Lo and Q6 is turned on.
When an iPod is connected, base is turned to Hi and Q7 is turned on.
I/O
Application
O
Not used.
I
External data bus switching input
I
CNVSS
O
Not used.
POWER GND
1
POWER+
2
iPod DET
iPod
COMMUNICATION
INTERFACE
SIGNAL WIRE GND
1
RX
2
TX
3
ACC 3.3
4
ACC TD
5
ACC DETECT
6
AUDIO-LEFT
1
AUDIO PAIR GND
2
AUDIO-RIGHT
3
Operation / Condition / Compatibility
Processing / Operation / Description
Connected to GND.
Connected to GND via register.
iPod INTERFACE
1
F/W GND
2
F/W GND
3
TPA+
4
USB D+
5
TPA-
6
USB D-
7
TPB+
8
USB PWR
9
TPB-
10
ACCESSORY IDENTIFY
11
F/W PER+
12
F/W PER+
13
ACCESSORY PWR(3.3V)
14
RESERVED
15
USB GND
16
DGND
17
RESERVED
18
DOCK TX
19
DOCK RX
20
ACCESSORY DETECT
21
RESERVED
22
RESERVED
23
RESERVED
24
RESERVED
25
LINE-IN L
26
LINE-IN R
27
AUDIO RETURN
28
LINE-OUT L
29
LINE-OUT R
30
DGND

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