MEX-BT2600 - Sony Car Audio Service Manual (repair manual). Page 31

1 to 4

AREASEL0 to 

AREASEL3

I

Model destination signal input terminal

5

BEEP

O

Beep sound drive signal output to the power amplifi er

6

CYRIL_SEL

I

Cyrillic letter response setting terminal    "H": corresponds to cyrillic letter

7

NCO

-

Not used

8

DIAG

I

Diagnostic signal input from the power amplifi er

9

VOLATT

O

Muting on/off control signal output to the electrical volume    "H": muting on

10

BT_AUDIO_SEL

O

Bluetooth/tuner audio selection signal output terminal    "L": bluetooth audio

11

VSS

-

Ground terminal

12

TUATT

O

Tuner muting on/off control signal output to the tuner unit

13

NSMASK

O

Discharge control signal output for the noise detection circuit    
"H": discharge (AEP, Russian and UK models only)

14

ILLUMI_SEL1

I

Illumination voltage setting terminal     "L": 9.0V, "H": 10.4V    Fixed at "L" in this set

15 to 22

NCO

-

Not used

23

VCC5

-

Power supply terminal (+3.3V)

24

EEP_SIO

I/O

Two-way serial data with the tuner unit

25

EEP_CKO

O

Serial clock signal output to the tuner unit

26

AMPSTB

O

Standby control signal output to the power amplifi er    "L": standby

27

LCD_CE

O

Chip enable signal output to the liquid crystal display driver

28

LCD_SO

O

Serial data output to the liquid crystal display driver

29

LCD_SCK

O

Serial clock signal output to the liquid crystal display driver

30

RDS_ON

O

Power on/off control signal output terminal for the RDS section  (AEP, Russian and UK 
models only)

31, 32

RE-IN0, RE-IN1

I

Jog dial pulse input from the rotary encoder

33

I2C_SCK

O

IIC serial clock signal output terminal

34

I2C_SIO

I/O

IIC two-way serial data bus terminal

35

DAVDD

-

Power supply terminal (+3.3V) (for A/D converter)

36

AVRH

I

Reference voltage (+3.3V) input terminal (for A/D converter)

37

DAVSS

-

Ground terminal (for A/D converter)

38

QUALITY

I

Noise level detection signal input from the tuner unit

39

VSM

I

FM and AM signal-meter voltage detection signal input from the tuner unit

40, 41

KEYIN1,

KEYIN0

I

Front panel key input terminal

42

VSS

-

Ground terminal

43

RC_IN0

I

Rotary remote commander key input terminal

44

NCO

-

Not used

45

BT_TEST1

O

Bluetooth section test mode (1) control signal output terminal 

46

BT_TEST2

O

Bluetooth section test mode (2) control signal output terminal 

47

BT_INT-HF

I

HF operation notifi cation signal input from the bluetooth section    "H" active    Not used

48

AD_ON

O

A/D converter power control signal output terminal    When the KEY ACK (pin 52) that con-
trols reference voltage power for key A/D conversion input is active, "L" is output from this 
terminal to enable the input

49 to 51

MD0 to MD2

I

Setting terminal for the CPU operational mode

52

KEYACT

I

Acknowledge signal (wake up signal) input terminal for the key entry Acknowledge signal is 
input to accept any function key in the standby status On at input of "H"

53

TU_ATTIN

I

Tuner muting zero cross detection signal input from the tuner unit

54

BUIN

I

Back up power supply detection signal input terminal    "L" is input at low voltage

55

BT_CVC

O

CVC selection request signal output to the bluetooth section    
"L": internal microphone CVC, "H": external microphone CVC

56

DAVN

I

Synchronize detection signal input of RDS data block (AEP, Russian and UK models only)

57

NCO

-

Not used

58

UNISI

I

SONY bus data input from the bus interface

59

UNISO

O

SONY bus data output to the bus interface

60

UNISCK

O

SONY bus clock signal output to the bus interface

61

B-OUT_SEL

I

Blackout setting terminal    "L": blackout ineffective, "H": blackout effective

62

NOSE_SW

I

Front panel remove/attach detection signal input terminal    "L": front panel is attached