LG KG280 Service Manual - Page 22

Interconnection with external devices - driver

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3. TECHNICAL BRIEF 3.5.1 Interconnection with external devices A. RTC block interface Countered by external X-TAL The X-TAL oscillates 32.768KHz B. LCD module interface The LCD module is controlled by CAMERA IC, AIT701G If AIT701G is in the state of by-pass mode, the LCD control signals from AD6720 are by-passed through AIT701G. In operating mode, the AIT701G controls the LCD module through L_MAIN_LCD_CS, L_SUB_LCD_CS, LCD_RESET, LCD_RS, LCD_WR, LCD_RD, L_DATA[15-00], 2V85_VCAM, IF_MODE, LCD_ID[1:3]. Signals L_MAIN_LCD_CS LCD_ID LCD_RESET LCD_WR LCD_RD LCD_RS 2V8_VLCD IF_MODE Description MAIN LCD driver chip enable. MAIN LCD driver IC has own CS pin Select LCD modoule maker(2.4V : BYD, 0V : LGIT) This pin resets LCD module. This signal comes from AD6720 directly. Enable writing to LCD Driver. Enable reading to LCD Driver. This pin determines whether the data to LCD module are display data or control data. LCD_RS can select 16 bit parallel bus. 2.8V voltage is supplied to LCD driver IC. Select 16bits or 8bits interface mode for MAIN LCD. For the future Table 3-2 . LCD CONTRON SIGNALS DISCRIPTION Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 23 - LGE Internal Use Only

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- 23 -
3. TECHNICAL BRIEF
3.5.1 Interconnection with external devices
A. RTC block interface
Countered by external X-TAL
The X-TAL oscillates 32.768KHz
B. LCD module interface
The LCD module is controlled by CAMERA IC, AIT701G
If AIT701G is in the state of by-pass mode, the LCD control signals from AD6720 are by-passed
through AIT701G.
In operating mode, the AIT701G controls the LCD module through L_MAIN_LCD_CS,
L_SUB_LCD_CS, LCD_RESET, LCD_RS, LCD_WR, LCD_RD, L_DATA[15-00], 2V85_VCAM,
IF_MODE, LCD_ID[1:3].
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
Signals
Description
L_MAIN_LCD_CS
MAIN LCD driver chip enable. MAIN LCD driver IC has own CS pin
LCD_ID
Select LCD modoule maker(2.4V : BYD, 0V : LGIT)
LCD_RESET
This pin resets LCD module. This signal comes from AD6720 directly.
LCD_WR
Enable writing to LCD Driver.
LCD_RD
Enable reading to LCD Driver.
LCD_RS
This pin determines whether the data to LCD module are display
data or control data. LCD_RS can select 16 bit parallel bus.
2V8_VLCD
2.8V voltage is supplied to LCD driver IC.
IF_MODE
Select 16bits or 8bits interface mode for MAIN LCD.
For the future
Table 3-2 . LCD CONTRON SIGNALS DISCRIPTION