XR-CA300, XR-L200 - Sony Car Audio Service Manual (repair manual). Page 25

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Pin No.

Pin Name

I/O

Description

1

VREF –

—

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

2

VSM

I

FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU100)
(A/D input)

3 to 6

NCI

I

Not used (fixed at “L”)

7

NOISE-DET

I

Noise level detection signal input at SEEK mode (A/D input)

8

MPTH

I

Multi-path detection signal input from the RDS decoder (IC200)

9

NCI

I

Not used (fixed at “L”)

10

VREF +

—

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

11

VDD

—

Power supply terminal (+5V)

12

OSC2

O

Main system clock output terminal (18.432MHz)

13

OSC1

I

Main system clock input terminal (18.432MHz)

14

VSS

—

Ground terminal

15

XI

I

Sub system clock input terminal (32.768kHz)

16

XO

O

Sub system clock output terminal (32.768kHz)

17

MMOD

I

Setting terminal for the single chip mode     “L”: single chip

18

LCD-SO (TX)

O

LCD serial data output to the liquid crystal display driver (IC900)

19

LCD-SI (RX)

I

LCD serial data input from the liquid crystal display driver (IC900)

20

LCD-CKO

O

LCD serial transfer clock signal output to the liquid crystal display driver (IC900)

21

TU-SDA

O

Serial data output to the FM/AM tuner unit (TU100)

22

TU-SI

I

Serial data input from the FM/AM tuner unit (TU100)

23

TU-SCL

O

Serial data transfer clock signal output to the FM/AM tuner unit (TU100)

24

LCD-RES

O

LCD reset signal output to the liquid crystal display driver (IC900)    “L”: reset

25

LCD-CE

O

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

26

KEYACK

I

Key acknowledge signal detect input from the liquid crystal display driver (IC900)

27

DAVN-RDS

I

RDS data request signal input from the RDS decoder (IC200)    “H” active

28

B/U-IN

I

Battery detect signal input from the SONY bus interface (IC800) and battery detect circuit
“L” is input at low voltage    IC800: Used for the XR-CA300 only

29

NCI

I

Not used (fixed at “L”)

30

RAM BU

I

Internal RAM reset detection signal input terminal
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset     “L”: RAM reset

31

TEST-IN

I

Setting terminal for the test mode    “L”: test mode, Normally: fixed at “H”

32

NCI

I

Not used (fixed at “L”)

33

RESET

I

System reset signal input from the reset signal generator (IC2) and reset switch (S1)
“L”: reset    “L” is input for several 100 msec after power on, then it changes to “H”

34

TU-ENABLE

O

Chip enable signal output to the  FM/AM tuner unit (TU100)    “H” active

35

BEEP

O

Beep sound drive signal output to the power amp (IC500)

36

POWER-ON

O

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

37

ILL-IN

I

Not used (fixed at “H”)

38

ACC-IN

I

Accessory detect signal input terminal    “L”: accessory on

39

NCO

O

Not used (open)

40

TEL-MUTE

I

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

41

NCI

I

Not used (fixed at “H”)

42

UNI-SO

O

Serial data output to the SONY bus interface (IC800)    Used for the XR-CA300 only

43

UNI-SI

I

Serial data input from the SONY bus interface (IC800)    Used for the XR-CA300 only