LG B2100, Service Manual

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Service Manual /
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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, CL761S If CL761S is in the state of by-pass mode, the LCD
control signals from AD6527 are by-passed through CL761S.
In operating mode, the CL761S 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], 2V8_VEXT, IF_MODE, LCD_ID[0:2].
Signals Description
_
LCD
_
CS MAIN LCD driver chip enable. MAIN LCD driver IC has own CS pin
LCD
_
DIM
_CTRL
It controls dimming mode of LCD module.(GPIO_5)
LCD
_
RESET
This pin resets LCD module. This signal comes from DBB directly.
(GPIO 15)
_
WR Enable writing to LCD Driver.
2V8_VMEM 2.8V voltage is supplied to LCD driver IC.
LCD_ID(GPIO_16) It determines the maker of LCD module.
LCD_BL_EN It controls back-light of LCD module.(GPO_23)
Table 3-3. LCD CONTRON SIGNALS DISCRIPTION