MEX-BT2500 - Sony Car Audio Service Manual (repair manual). Page 36

36

•

1 to 3

AREASEL0 to

AREASEL2

I

Model destination signal input terminal

4

B-OUT SEL

I

Blackout setting terminal    "H": blackout effective

5

BEEP

O

Beep sound drive signal output to the power amplifier

6

NCO

-

Not used

7

DIAG

I

Diagnostic signal input from the power amplifier

8

AMPSTB

O

Standby control signal output to the power amplifier

9

VOLATT

O

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

10

NCO

-

Not used

11

VSS

-

Ground terminal

12

TUATT

O

Tuner muting on/off control signal output terminal

13

NSMASK

O

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

14

ILLUMI_SEL

I

Illumination voltage setting terminal    "L": 10.4V, "H": 12.5V    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 data bus with the tuner unit

25

EEP_CKO

O

Serial data transfer clock signal output to the tuner unit

26

RDS_ON

O

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

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_CKO

O

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

30

NCO

-

Not used

31, 32

RE-IN0, RE-IN1

I

Jog dial pulse input from the rotary encoder

33

I2C_SCK

O

IIC data transfer clock signal output terminal

34

I2C_SIO

I/O

IIC two-way data bus

35

DAVDD

-

Power supply terminal (+3.3V)

36

AVRH

I

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

37

DAVSS

-

Ground terminal

38

QUALITY

I

Noise level detection signal input at SEEK mode

39

VSM

I

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

40, 41

KEYIN1,

KEYIN0

I

Front panel key input terminal (A/D input)

42

VSS

-

Ground terminal

43 to 46

NCO

-

Not used

47

BT_INT-HF

I

HF operation notification signal input from the bluetooth section    "H": active

48

AD_ON

O

A/D converter power control signal output
When the KEYACK (pin 52) that controls 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

KEY ACK

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

TUATTIN

I

Attenuate request signal input from the tuner unit

54

BUIN

I

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

55

NCO

-

Not used

56

DAVN

I

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

57

NCO

-

Not used