MDX-CA790X - Sony Car Audio Service Manual (repair manual). Page 39

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Pin No.

Pin Name

I/O

Description

1

DAVDD

—

Power supply terminal (+3.3V)

2

NCO

O

Not used

3

DAVSS

—

Ground terminal

4 to 9

NCO

O

Not used

10

VDD1

—

Power supply terminal (+3.3V)

11

MMOD

I

Internal flash memory data write mode detection signal input terminal    Not used

12

OSCOUT

O

System clock output terminal (27.648 MHz)

13

OSCIN

I

System clock input terminal (27.648 MHz)

14

VSS1

—

Ground terminal

15

XIN

I

System clock input terminal (32.768 kHz)

16

XOUT

O

System clock output terminal (32.768 kHz)

17

VDD2

—

Power supply terminal (+3.3V)

18

MOD1

I

Setting terminal for the CPU operational mode    fixed at “H”

19

RESET

I

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

20

RCIN1

I

Rotary remote commander shift key input terminal

21

ACCIN

I

Accessory power detection signal input terminal    “L”: accessory power on

22

TESTIN

I

Test mode setting terminal    “L”: test mode, normally fixed at “H”

23

TELLATT

I

Telephone muting detection signal input terminal
At input of “H”, the audio signal is attenuated by 20 dB

24

ATT

O

Audio muting on/off control signal output terminal

25

ADON

O

A/D converter power control signal output
When the KEY ACK (pin 27) that controls reference voltage power for key A/D conversion input 
is active, “L” is output from this terminal to enable the input

26

NCO

—

Not used

27

KEYACK

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”

28

TUATTIN

I

Tuner muting zero-cross detection signal input terminal

29

MDON

I

Power supply on/off control signal input of the servo section

30

MDMON

I

Power supply on/off control signal input of the MD mechanism deck section

31

BUIN

I

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

32

NCO

O

Not used

33

UNISO

O

Serial data output to the SONY bus interface IC

34

UNISI

I

Serial data input from the SONY bus interface IC

35

UNICKO

O

Serial data transfer clock signal output to the SONY bus interface IC and MD mechanism 
controller

36 to 38

NCO

O

Not used

39

OPENREQ

O

Front panel open request signal output terminal    Not used

40

BUSON

O

SONY bus on/off control signal output terminal    “L”: bus on

41

MDBOOT

O

Internal flash memory data write control signal output terminal    Not used

42

SYSRST

O

System reset signal output to the MD mechanism controller and SONY bus interface IC

43 to 50

NCO

O

Not used

51

AMPATT

O

Amplifier muting on/off control signal output terminal    Not used

52

DEST1

I

Setting terminal for the destination

53, 54

DEST2, DEST3

I

Setting terminal for model discrimination    Not used

55

DOORSW

I

Front panel open/close detection input terminal    “L”: close