Kenwood KDC-348U Service Manual page 8

KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name
81 MUTE AFS
82 PWIC MUTE
83 PWIC STBY
84 PWIC DC ERR
85 LX DATA M
86 LX DATA S
87 LX CLK
88 NC
89 DVCC3
90 DVSS
91 SW DIO
92 SW CLK
93 TRACE CLK
94 TRACE DATA 0
95 TRACE DATA 1
96 TRACE DATA 2
97 TRACE DATA 3
98 AUD SDA
99 AUD SCL
100 LX RST
101 LX MUTE
102 LX REQ M
103 LX CON
104 USB PON
105 USB OC
106 NC
107 MUTE PRE
108 MUTE PRE SW
109 LX REQ S
110 TUN SDA
111 TUN SCL
112 REMO
113 REMO
114 REG VCC3
115 XT1
116 XT2
117 CVCC3
118 X1
119 CVSS
8
I/O Application
I/O AFS mute
O Power IC mute
O Power IC standby control
Detection of power IC's +B and GND short-
I
circuited
O Data to slave unit
I Data from slave unit
I/O LX-BUS clock
- Not used
- Power supply
- GND
- For on-board writing
- For on-board writing
- For debug
- For debug
- For debug
- For debug
- For debug
I/O I2C data input/output (E-VOL IC control)
O I2C clock input/output (E-VOL IC control)
O Forced reset to slave unit
I Mute request from slave unit
O Communication request to slave unit
O Start-up request to slave unit
O USB P.ON output
I USB over-current detection
- Not used
O External preout mute
O External preout mute (SUB)
I Communication request from slave unit
I/O I2C data input/output (Tuner IC control)
O I2C clock output (Tuner IC control)
Input signal of remote control reception and
I
wired remote control
I Remote control signal input
- Power supply
I Low frequency resonator connection
O Low frequency resonator connection
- Power supply
I High frequency resonator connection
- GND
Truth Value
Processing / Operation / Description
Table
L: Mute ON (Time constant solo setting: 0.5ms),
Hi-Z: Normal
STANDBY source or momentary power down: L,
TEL mute: L
POWER ON: H, POWER OFF: L
SIO mode transmission
SIO mode reception
SIO mode clock (125kHz or 107kHz)
Output L fi xed
Communication with E2PROM for system
μ-COM data keeping
Communication with E2PROM for system
μ-COM data keeping
H: Reset, L: Normal
H: Mute ON, L: Mute OFF
H: Slave unit ON, L: Slave unit OFF
H: ON, L: OFF
L: Detected, H: Normal
Output L fi xed
O-bit or momentary power down: L, L: Mute ON
O-bit or momentary power down: L, L: Mute ON
For external interrupt
I2C clock frequency: 200kHz
Pulse width detection
Even pin No.112 is being short-circuited, input
signal can be ignored in software
Sub clock: 32.768kHz
Sub clock: 32.768kHz
Main clock: 12MHz