LG MG120a Service Manual page 22

3. TECHNICAL BRIEF
B. LCD module interface
Signals
LCD_CS/
LCD_REST/
LWR/
SUBLCD_CS/
LCD_ID_CHK
A1
The backlight of LCD module is controlled by AD6720 via AAT3122, U301.The
Control signals related to Backlight LED are given bellow.
Signals
LCD_BACK_EN
MLED_A
Table 3-5: LCD Backlight LED Control
There are two steps of the LCD back light setting, bright and middle level,
this two levels setting will save power in some condition.
C. RF interface
The AD6720 control RF parts through PA_BAND, ANT_SW1, ANT_SW2,
CLKON , PA_EN, S_EN, S_DATA, S_CLK, RF_PWR_DWN.
Main LCD driver chip enable.
Thos pin resets LCD module.
Enable writing to LCD Driver.
SUB LCD Driver chip enable
This pin determines the LCD module type
Select 16bits interface mode for MAIN LCD
Table 3-4: LCD Pin Description
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Description
Description
Control LCD backlight in 2 steps
Current source backlight LED