4.19UPD784225GK-629 (IC1501) : CPU

• Pin layout

60 ~ 41

6140

~~

8021

1 ~ 20

• Pin function

Pin No.

Symbol

I/O

Function

 

 

 

 

1

TEMP IN

I

Temp. detection input terminal

 

 

 

 

2,3

-

-

No use

 

 

 

 

4

AVSS

-

GND

 

 

 

 

5

ADCONT

O

Output H level during power on. During stop mode:L

 

 

 

 

6

-

-

-

 

 

 

 

7

AVREF1

-

3.3V

 

 

 

 

8

EPROMDI

I

EEPROM data input terminal

 

 

 

 

9

EPROMDO

O

EEPROM data output terminal. Output H level during input

 

 

 

 

10

EPROMCK

I/O

EEPROM clock signal input/output terminal

 

 

 

 

11

LCD CE

O

Chip enable output for LCD driver

 

 

 

 

12

LCD DA

O

Data output for LCD driver

 

 

 

 

13

LCD CK

O

Clock output for LCD driver

 

 

 

 

14

BUS I/O

O

JVC BUS input/output control terminal (negative)

 

 

 

 

15

BUS I/O

O

JVC BUS input/output control terminal

 

 

 

 

16

BUS SI

I

JVC BUS data input terminal

 

 

 

 

17

BUS SO

O

JVC BUS data output terminal

 

 

 

 

18

BUS SCK

I/O

JVC BUS clock input/output terminal

 

 

 

 

19

BUSOUT

O

JVC BUS BUSOUT output terminal

 

 

 

 

20

CD ON

O

Power supply (3.3V) control for CD

 

 

 

 

21

CD REQ

O

CD mechanism power supply on request signal output terminal

 

 

 

 

22

CD MUTE

O

CD mute signal output terminal

 

 

 

 

23

-

-

-

 

 

 

 

24

DSP RESET

O

CD DSP reset signal output terminal

 

 

 

 

25

CCE

O

CD DSP chip enable output terminal

 

 

 

 

26

BUCK

O

CD DSP data clock output terminal

 

 

 

 

27

BUS3

I/O

CD DSP data 3 input/output terminal

 

 

 

 

28

BUS2

I/O

CD DSP data 2 input/output terminal

 

 

 

 

29

BUS1

I/O

CD DSP data 1 input/output terminal

 

 

 

 

30

BUS0

I/O

CD DSP data 0 input/output terminal

 

 

 

 

31

2X PLAY

O

RF frequency response select output of 2x speed playback

 

 

 

 

32

RW SEL

O

CD-RW select output terminal (RW:L)

 

 

 

 

33

VSS1

-

GND

 

 

 

 

34

LD

O

Loading signal output terminal (L:loading, H:eject)

 

 

 

 

35

LD/FE

O

Loading/Feed select signal output terminal (H:LD, L:FE)

 

 

 

 

36

MP3 DI

I

CD MP3 data input terminal

 

 

 

 

37

MP3 DO

O

CD MP3 data output terminal

 

 

 

 

38

MP3 CK

O

Clock signal output terminal for CD MP3 data

 

 

 

 

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JVC KD-LX555R service manual 19 UPD784225GK-629 IC1501 CPU
Page 23 Page 25

KD-LX555R specifications

The JVC KD-LX555R is a feature-rich car stereo receiver that combines cutting-edge technologies with an impressive array of functionalities, making it a popular choice among car audio enthusiasts. One of the standout features of the KD-LX555R is its compatibility with various audio playback formats, including MP3, WMA, and WAV files. This versatility allows users to enjoy their favorite music from different sources without compromising on sound quality.

Equipped with a front AUX input and a USB port, the KD-LX555R facilitates convenient connectivity for external devices like smartphones and USB drives. This feature enables users to access their digital music collections seamlessly while driving. Additionally, the unit's Bluetooth capability allows for hands-free calling and wireless audio streaming, enhancing convenience and safety by minimizing distractions while driving.

The receiver boasts a sleek and modern design, featuring an easy-to-read LCD display and user-friendly controls. The customizable illumination options enable users to match the display color to their vehicle’s interior, adding a personalized touch. Its ergonomic layout ensures that drivers can adjust settings and navigate menus with minimal effort, allowing for a safer driving experience.

Sound quality is a paramount consideration for JVC, and the KD-LX555R does not disappoint. It features a powerful MOSFET amplifier, delivering robust audio performance with impressive clarity and depth across all frequencies. The inclusion of a 3-band parametric equalizer also allows users to fine-tune the audio output according to their preferences and the acoustics of their car.

For those who desire even more control over their sound, the KD-LX555R supports additional amplifiers and subwoofers through its preamp outputs. This feature empowers users to easily upgrade their sound systems and achieve the desired audio experience. Moreover, the receiver integrates seamlessly with smartphones, enabling features like music control through voice commands.

In summary, the JVC KD-LX555R is a comprehensive car audio solution that emphasizes connectivity, sound quality, and user convenience. With its modern features, robust performance, and customizable options, it caters to a wide range of audio preferences, making it a worthy addition to any car. Whether enjoying favorite tracks or making hands-free calls, the KD-LX555R delivers an exceptional in-car experience that combines technology with practicality.
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