Kenwood KDC-MP538U Service Manual page 7

MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name I/O
71 ACC DET I
72 BU DET I
73 LX REQ S I
74 MUTE AFS I/O IC-2 MUTE C control / AFS mute
75 SDAEVOL I/O Data output from system μ-COM to E-VOL
75 SDAE2P I/O I2C data for ROM correction
76 SCLEVOL I/O Clock output from system μ-COM to E-VOL
76 SCLE2P I/O I2C clock for ROM correction
77 PWIC MUTE O
78 PWIC STBY O
79 LX REQ M O
80 LX MUTE I
81 LX CON O
82 LX RST O
83 MUTE PRE FR O
84 MUTE PRE SW O
85 PON AM I/O AM+B power supply control
86 TUN IFC OUT I
87 TUN SMETER I
88 RDS NOISE I
89 RDS AFS M I/O Noise detection time constant SW
90 TYPE 1 I
91 TYPE 2 I
92,93 NC -
94 AVSS -
95 NC -
96 VREF -
97 AVCC -
98 LX DATA S I
99 LX DATA M O
100 LX CLK I/O LX-BUS clock
Truth value table
q CD motor control
CD MOTOR (Pin 40)
Standby L
Eject H
Load H
Brake H
Application
ACC detection
BU detection
Communication request from slave unit
Power IC mute
Power IC standby
Communication request to slave unit
Mute request from slave unit
Start-up request to slave unit
Forced reset to slave unit
External preout mute F/R
External preout mute SUB
(Countermeasure for mute shock noise)
Front-end IFC-OUT input
S-meter voltage detection
FM noise voltage detection
A/D (5-pattern)
A/D (5-pattern)
Not used
Not used
Data from slave unit
Data to slave unit
CD LOEJ (Pin 45)
L
H
L
Hi-z
KDC-MP538U/MP6039/MP6539U/
W6041U/W6141UY/W6541U/W6641UY/X592
Truth Value
Processing / Operation / Description
Table
ACC detected: L, No ACC: H
BU detected: L, No BU or Momentary power
down or Over-voltage: H
L: Mute ON, Hi-Z: Normal,
Time constant isolation setting: 0.5ms
Communication speed: 200k-400kHz
Communication speed: 200k-400kHz
Communication speed: 200k-400kHz
Communication speed: 200k-400kHz
STANDBY source or Momentary power down:
L, TEL mute: L
POWER ON: H, POWER OFF: L
H: Mute ON, L: Mute OFF
H: Slave unit ON, L: Slave unit OFF
H: Reset, L: Normal
0-bit, Momentary power down: L
0-bit, Momentary power down: L
H: AM received, Hi-z: Other conditions
H: Station detected, L: No station
L: AF search, Hi-Z: Normal
Output L fi xed
Output L fi xed
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