XR-CA665EE - Sony Car Audio Service Manual (repair manual). Page 23

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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 tuner unit (A/D input)

3

NIL

I

Connected to the ground

4

KEYIN1

I

Front panel key input terminal (A/D input)

5

KEYIN0

I

Front panel key input terminal (A/D input)

6

RC_IN0

I

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

7

QUALITY

I

Noise level detection signal input at the SEEK mode (A/D input)    Not used

8

NIL

I

Connected to the ground

9

DSTSEL

I

Destination setting terminal

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

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” in this set)

18

LCDSO

O

Serial data output to the liquid crystal display driver

19

LCDCE

O

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

20

LCDCKO

O

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

21 to 23

NCO

O

Not used

24

SYSRST

O

System reset signal output to the SONY bus interface    “L”: reset

25

BUSON

O

Bus interface control signal output to the SONY bus interface    “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

DAVN

I

Sync detection signal of RDS data block input terminal    “H” active    Not used

28

BU_IN

I

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

29

SIRCS

I

SIRCS remote control signal input from the remote control receiver

30

TUATT IN

I

Tuner muting on/off control signal input from the tuner unit    “L”: muting on

31

NIL

I

Connected to the ground

32

NIH

I

Connected to the power supply (+5V)

33

RESET

I

System reset signal input from the reset signal generator and reset switch    “L”: reset
For several hundreds sec. after the power supply rises, “L” is input, then it changes to “H”

34

TUNON

O

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

35

BEEP

O

Beep sound drive signal output to the power amplifier

36, 37

NCO

O

Not used

38

ACCIN

I

Accessory detection signal input terminal    “L”: accessory on

39

NCO

O

Not used

40

TELATT

I

Telephone attenuate signal input terminal    At input of “H”, the signal is attenuated by –20 dB

41

NIH

I

Connected to the power supply (+5V)

42

BUSSO

O

Serial data output to the SONY bus interface

43

BUSSI

I

Serial data input from the SONY bus interface

44

BUSCKO

O

Serial data transfer clock signal output to the SONY bus interface

45

I2CSIO

I/O

Two-way data bus with the tuner unit and electrical volume