Kenwood KDC-MP225 Service Manual page 6

KDC-MP225,MP4026/G
KDC-W4527/G/GY/Y,W427Y
MICROCOMPUTER'S TERMINAL DESCRIPTION
SYSTEM MICROPROCESSOR : 784225GC231A (X25 : IC1)
Pin No. Pin Name
1 TUN SMETER
2 RDS NOISE
3 LINE MUTE
4 AVSS
5 L RST
6 L CE
7 AVREF1
8 L DATAL
9 L DATAS
10 L CLK
11 TDF DET
12 AUX ON
13 RDS QUAL
14 RDS DATA
15 PWIC BEEP
16 LX DATA S
17 LX DATA M
18 LX CLK
19 TUN SCL
20 TUN SDA
21 TUN IFC OUT
22 RDS AFS
23 CD SDA
24 AUD SDA
25 NC
26 LX RST
27 LX CON
28 LX MUTE
29 LX REQ M
30 PWIC SVR
31 PWIC STBY
32 PWIC MUTE
33 VSS1
34 ACC DET
35 RESET2
36 MUTE
37 BU DET
38 PARK SW
39 PS2 1
6
I/O
I S meter detection input terminal
I FM noise detection input terminal
I Phone Muting signal input terminal (More than 2.5V : NAVI mute, Less than 1.0V : TEL mute)
- GND
O Reset signal output (for LCD driver)
O CE output for LCD driver IC
- BU5.0V
I DATA input terminal from LCD derive IC
O DATA output terminal to LCD driver IC
O CLK output terminal to LCD driver IC
I Panel assy detect terminal
O Select for AUX input signal
I RDS decoder QUAL signal input terminal
I RDS decoder Data signal input terminal
O Beep audio signal output terminal
I DATA signal input from EXT. unit
O DATA signal output to EXT. unit
I/O CLK signal input/output to EXT. unit
O I2C CLK signal output terminal (for front-end)
I/O I2C DATA signal input/output terminal (for front-end)
I IFC signal input terminal
O Time constant select terminal (for noise detect)
I/O I2C DATA output terminal (for CD mechanism, electric VR)
O CLK output terminal (for CD mechanism, electric VR)
- NC
O Reset signal output to EXT. unit
O Control signal output to EXT. unit
I Request signal input terminal from EXT. unit
O DATA signal output to EXT. unit
O SVR control for Audio power IC
O STBY control for Audio power IC
O Muting control for Audio power IC
- GND
I ACC detection input terminal
O Reset output terminal L : Active
O Muting signal output terminal
I BU detect input terminal
I Packing condition detect terminal
O Power supply IC control terminal
Description / Processing Operation
H : Light on display, key scan, L : Light out on display, key reset
H : Panel assy come off
H : AUX, L : Other
H : Station detect, L : No detect
H : Receiving, L : FM seek, AF search
H: ON L: OFF
L : Mute ON
H : Power IC ON
L : ACC detect
L : BU detect
H : OFF, L : ON (PARKING)