XAV-7W (serv.man2) - Sony Car Audio Service Manual (repair manual). Page 54

54

Pin No.

Pin Name

I/O

Description

54

VCC

—

Power supply terminal (+5V)

55

ST-BY

O

Standby on/off control signal output to the power amplifier
“L”: standby mode, “H”: amplifier on

56

NS-MASK

O

Discharge control signal output terminal for the noise detection circuit   “H”: discharge

57

DDC-ON

O

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

58

SIDEBRK

I

Sidebreake state detection signal input    “L”: at stopping, “H”: at running

59

RGB SEL

O

RGB signal selection signal output to the display controller    “L”: video, “H”: RGB (navi)

60

KEY ILL

O

Key illumination LED drive signal output    “H”: LED on

61

OPNCLS

I

OPEN/CLOSE key input terminal

62

AMUTE

O

Audio line muting on/off control signal output to the monitor internal power amplifier
“L”: muting on    Not used

63

VSS

—

Ground terminal

64

NCO

O

Not used

65

PWM

I

For frequency counting signal input from the power control

66 to 68

NCO

O

Not used

69

FLASH-W

I

Internal flash memory data write mode detection signal input terminal    “L”: data write mode

70

I2C-SDA

I/O

Two-way data I2C bus with the tuner unit, RDS decoder and electrical volume

71

I2C-SCL

I/O

I2C bus clock signal input/output to with tuner unit , RDS decoder and electrical volume

72

RC-IN1

I

Rotary remote commander shift key input terminal    “L”: shift key on

73

X1A

O

Sub system clock output terminal (32.768 kHz)

74

X0A

I

Sub system clock input terminal (32.768 kHz)

75

DAVN

I

Synchronized detection signal of RDS data block input from the RDS decoder    “L” active

76

NCO

O

Not used

77

BU IN

I

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

78

NCO

O

Not used

79

KEY ACK

I

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

80

AD-ON

O

A/D converter power control signal output
When the KEY ACK (pin ul) that controls reference voltage power for key A/D conversion 
input is active, “L” is output from this terminal to enable the input

81

ACCIN

I

Accessory detection signal input    “L”: accessory on

82

BACK SEN

I

Back gear interrupt signal input terminal    “L” active    Not used

83

P-ON

O

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

84

TEST-IN

I

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

85

RAM-BU

I

Internal RAM reset detection signal input from the reset signal generator
Input terminal to check that RAM data are not destroyed due to low voltage
 “L”: RAM clear, “H”: RAM destruction check

86

HSTX

I

Hardware standby signal input terminal    “L”: hardware standby mode
Reset signal input in this set

87

MD2

I

Setting terminal for the CPU operational mode (fixed at “L” in this set)

88, 89

MD1, MD0

I

Setting terminal for the CPU operational mode (fixed at “H” in this set)

90

RSTX

I

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

91

VSS

—

Ground terminal

92

X0

I

Main system clock input terminal (3.58 MHz)

93

X1

O

Main system clock output terminal (3.58 MHz)

94

VCC

—

Power supply terminal (+5V)