XT-XM1 — Sony Car Audio Service Manual (repair manual). Page 5

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XT-XM1
5
5
• IC Block Diagrams
IC103
TA2050F (EL)
IC106
BA8272FV-E2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16 NC
IN(–)1
IN(+)1
IN(+)2
IN(–)2
NC
NC
NC
OUT1
VREF
NC
GND
NC
VCC
NC
OUT2
1
2
3
4
5
6
7
8
9
10
14
13
12
11
VCC
BUS ON
LINK OFF
CLK OUT
DATA OUT
DATA IN
BUS RESET
BUS DATA
VREF
BUS CLK
GND
BUS ON IN
BUS ON OUT
RESET
RESET
SWITCH
• Waveform
1
IC107 
qs
 (OSC2)
2.7 Vp-p
54 ns
3-2.
IC  PIN  FUNCTION  DESCRIPTION
 IC107   MN101C49GYB1 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
VREF–
I
Reference voltage (0V) input terminal (for A/D converter)
2
FLASH
I
Internal flash memory data write mode detection signal input terminal    “L”: data write mode
3 to 9
(IN-L)
I
Not used
10
VREF+
I
Reference voltage (+5V) input terminal (for A/D converter)
11
VDD
Power supply terminal (+5V)
12
OSC2
O
Main system clock output terminal (18.432 MHz)
13
OSC1
I
Main system clock input terminal (18.432 MHz)
14
VSS
Ground terminal
15
XI (VSS)
I
Sub system clock input terminal    Not used
16
XO
O
Sub system clock output terminal    Not used
17
MMOD (VSS)
I
Memory mode selection signal input terminal    Not used
18
TX
O
IS bus “TXRX” signal output terminal
19
RX
I
IS bus “TXRX” signal input terminal
20
IS FOUT
O
IS bus “FRAME” signal output terminal
21
SO
O
Serial data output to the SONY bus interface
22
SI
I
Serial data input from the SONY bus interface
23
SCLK
O
Serial clock signal output to the SONY bus interface 
24
GND
Ground terminal
25
LINKOFF
O
Bus on/off control signal output    “L”: bus on
26
BUSON
I
Bus on/off control signal input from the SONY bus interface     “H”: bus on
27
(IN-L)
I
Not used
28
BU IN
I
Battery detection signal input terminal    “L” is input at low voltage
29
IS FIN
I
IS bus “FRAME” signal input terminal
30, 31
(IN-L)
I
Not used
32
VDD2
Power supply terminal (+5V)
33
X T RESET
I
System reset signal input from the reset signal generator    “L”: reset
“L” is input for several 100 msec after power on, then it changes to “H”
34 to 40
(IN-L)
I
Not used
41
VPP
Power supply terminal (+5V)
42
PC-TX
O
Not used
43
PC-RX
I
Not used
44
NC
Not used
45
E2PROM-SCL
O
Serial data transfer clock signal output to the EEPROM
46
NC
Not used
47
E2PROM-SDA
I/O
Two-way data bus with the EEPROM
48 to 62
NC
Not used
63
X M-RESET
O
Reset signal output to the MAIN board    “L”: reset
64
X M-STANDBY
O
Standby signal output to the MAIN board    “L”: standby
65
P-ON
O
+9V power supply on/off control signal output    “H”: power on
66
SELECT (H-XM)
O
Relay drive signal output     “H”: XM on
67
X MUTE
O
Muting on/off control signal output    “L”: muting on
68 to 94
NC
Not used
95
DAVSS
Ground terminal (for D/A converter)
96to 99
NC
Not used
100
DAVDD
Power supply terminal (+5V) (for D/A converter)
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