LG B2050 Service Manual - Page 26

C. RF interface

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3. TECHNICAL BRIEF The backlight of LCD module is controlled by DBB via TPS60230RGTR , U400. The control signals related to Backlight LED are given bellow. Signals LCD_DIM_CTL (GPO 5) LCD_LED_CTL LCD_LED_GND LCD_BL_EN Description Control LCD backlight level in 16 steps Control LCD LED It Controls back-light of LCD module. (GPO_223) Table 3-4 DESCRIPTION OF LCD BACKLIGHT LED CONTROL C. RF interface The AD6527 control RF parts through PA_BAND, ANT_SW1, ANT_SW2, ANT_SW2 , CLKON , PA_EN, S_EN, S_DATA, S_CLK, RF_PWR_DWN. Signal Description PA_BAND (GPO 17) PAM Band Select ANT_SW1 (GPO 9) ANT_SW2 (GPO 10) Antenna switch Band Select Antenna switch Band Select ANT_SW3 (GPO 11) Antenna switch Band Select CLKON PA_EN (GPO 16) RF LDO Enable/Disable PAM Enable/Disable S_EN (GPO 19) S_DATA (GPO 20) S_CLK (GPO 21) RF_PWR_DWN(GPO 4) PLL Enable/Disable Serial Data to PLL Clock to PLL Power down Input Table 3-5 RF CONTRON SIGNALS DISCRIPTION - 25 -

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3. TECHNICAL BRIEF
- 25 -
The backlight of LCD module is controlled by DBB via TPS60230RGTR , U400. The control signals
related to Backlight LED are given bellow.
Signals
Description
LCD_DIM_CTL
(GPO 5)
LCD_LED_CTL
LCD_LED_GND
LCD_BL_EN
Control LCD backlight level in 16 steps
Control LCD LED
It Controls back-light of LCD module. (GPO_223)
Table 3-4 DESCRIPTION OF LCD BACKLIGHT LED CONTROL
C. RF interface
The AD6527 control RF parts through PA_BAND, ANT_SW1, ANT_SW2, ANT_SW2 , CLKON
, PA_EN, S_EN, S_DATA, S_CLK, RF_PWR_DWN.
Signal
Description
PA_BAND (GPO 17)
PAM Band Select
ANT_SW3 (GPO 11)
Antenna switch Band Select
PA_EN (GPO 16)
PAM Enable/Disable
S_DATA (GPO 20)
Serial Data to PLL
S_CLK (GPO 21)
Clock to PLL
S_EN (GPO 19)
PLL Enable/Disable
RF_PWR_DWN(GPO 4)
Power down Input
ANT_SW1 (GPO 9)
Antenna switch Band Select
ANT_SW2 (GPO 10)
Antenna switch Band Select
CLKON
RF LDO Enable/Disable
Table 3-5 RF CONTRON SIGNALS DISCRIPTION