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3. TECHNICAL BRIEF
The backlight of LCD module is controlled by AD6721 via AAT3155 , U603. The control
signals related to Backlight LED are given bellow.
C. RF interface
The AD6721 control RF parts through PA_BAND, ANT_SW1, ANT_SW2, ANT_SW3 , CLKON ,
PA_EN, S_EN, S_DATA, S_CLK
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Signals Description
MLED Current source for backlight LED
LCD_DIM_CTL Control LCD backlight level in 16 steps
MLED[1:3] This pins are returned-paths for backlight LED current source (MLED)
Table 3-3. DESCRIPTION OF LCD BACKLIGHT LED CONTROL
Signals Description
PA_BAND (GPO 17) PAM Band Select
ANT_SW1 (GPO 9) Antenna switch Band Select
ANT_SW2 (GPO 10) Antenna switch Band Select
PA_EN (GPO 16) PAM Enable/Disable
S_EN (GPO 19) PLL Enable/Disable
S_DATA (GPO 20) Serial Data to PLL
S_CLK (GPO 21) Clock to PLL
Table 3-4. RF CONTROL SIGNALS DESCRIPTION
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