XR-CA630X (serv.man2) - Sony Car Audio Service Manual (repair manual). Page 26

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Pin No.

Pin Name

I/O

Description

1

VREF–

I

Reference voltage (0V) input terminal (for A/D converter)

2

VSM

I

FM and AM signal meter voltage detection signal input from the FM/AM tuner unit (TU1)
(A/D input)

3

NIL

I

Not used (fixed at “L”)

4

KEYIN1

I

Key input terminal (A/D input) LSW902, LSW905 to LSW909, LSW911, S902 to S905
(MENU, SOUND, ENTER, S SCROLL, PTY D DISPLAY, LIST, AF, > M SEEK+,
. m SEEK–, DISC/PRESET+, DISC/PRESET– keys input)

5

KEYIN0

I

Key input terminal (A/D input) LSW901, LSW903, LSW904, LSW914 to LSW919, S906, S907 
(OFF, SOURCE, MODE o, SHUF 6, 5, 4, 3 REP, 2, 1 keys input)

6

RCIN0

I

Rotary remote commander key input terminal (A/D input)

7, 8

NIL

I

Not used (fixed at “L”)

9

DSTSEL

I

Destination setting terminal    Fixed at center voltage in this set

10

VREF+

I

Reference voltage (+5V) input terminal (for A/D converter)

11

VDD

—

Power supply terminal (+5V)

12

OSCOUT

O

Main system clock output terminal (18.432 MHz)

13

OSCIN

I

Main system clock input terminal (18.432 MHz)

14

VSS

—

Ground terminal

15

XI

I

Sub system clock input terminal (32.768 kHz)

16

XO

O

Sub system clock output terminal (32.768 kHz)

17

MMOD

I

Selection signal of memory mode input terminal    “L”: single chip mode (fixed at “L”)

18

LCDSO

O

Serial data output to the liquid crystal display driver (IC900)

19

LCDCE

O

Chip enable signal output to the liquid crystal display driver (IC900)    “H” active

20

LCDCKO

O

Serial data transfer clock signal output to the liquid crystal display driver (IC900)

21 to 23

NCO

O

Not used (open)

24

SYSRST

O

Reset signal output to the SONY bus interface (IC581)    “L”: reset

25

BUSON

O

Bus on/off control signal output to the SONY bus interface (IC581)    “L”: bus on

26

KEYACK

I

Input of acknowledge signal for the key entry    Acknowledge signal is input to accept function 
and eject keys in the power off status    On at input of “H”

27

NIL

I

Not used (fixed at “L”)

28

BUIN

I

Battery detection signal input from the SONY bus interface (IC581)  
“L” is input at low voltage

29

SIRCS

I

SIRCS remote control signal input from the remote control receiver (IC971)

30, 31

NIL

I

Not used (fixed at “L”)

32

VDD2

—

Power supply terminal (+5V)

33

RESET

I

System reset signal input from the reset signal generator (IC551) and reset switch (S551)
“L”: reset    “L” is input for several 100 msec after power on, then it changes to “H”

34

TUNON

O

Tuner system power supply on/off control signal output    “H”: tuner power on

35

BEEP

O

Beep sound drive signal output to the power amplifier (IC751)

36

PW_ON

O

Main system power supply on/off control signal output    “H”: power on

37

NCO

I

Not used (open)

38

ACCIN

I

Accessory detection signal input    “L”: accessory on

39

NCO

O

Not used (open)

40

TELATT

I

Telephone attenuate signal input    At input of “H”, the signal is attenuated by –20 dB
Not used (fixed at “L”)

41

VPP

I

Not used (fixed at “H”)

42

BUSSO

O

Serial data output to the SONY bus interface (IC581)