LG KG110 - Interconnection with External Devices; RTC Block Interface; LCD Module Interface; RF Interface

3. TECHNICAL BRIEF
3.3.2 Interconnection with external devices
A. RTC block interface
Countered by external X-TAL
The X-TAL oscillates 32.768KHz
B. LCD module interface
16
Signals Description
L_MAIN_LCD_CS MAIN LCD driver chip enable.
LCD_RESET This pin resets LCD module.
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
data or control data.
A1 Select 16bits interface mode for MAIN LCD.
Signals Description
LCD_LED_CTL Control LCD backlight level in 4 steps
DISP_LIGHT Current source for backlight LED
Signals Description
PA_BAND (GPO17) PAM Band Select
ANT_SW1 (GPO9)Antenna switch Band Select
ANT_SW2 (GPO11) Antenna switch Band Select
RF_PWR_DWN(GPO 4) Power down Input
CLKON RF LDO Enable/Disable
Table 3-4: LCD Pin Description
Table 3-5. Description Of LCD Backlight LED Control
The backlight of LCD module is controlled by AD6720 via AAT3110 , U300.
The control signals related to Backlight LED are given bellow.
C. RF interface
The AD6720 control RF parts through PA_BAND, ANT_SW1, ANT_SW2, ANT_SW3 ,
CLKON ,PA_EN, S_EN, S_DATA, S_CLK, RF_PWR_DWN.