Interconnection With External Devices; Rtc Block Interface; Lcd Module Interface; Rf Interface - LG KG110 Service Manual

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
Signals
L_MAIN_LCD_CS
LCD_RESET
LCD_WR
LCD_RD
LCD_RS
A1
The backlight of LCD module is controlled by AD6720 via AAT3110 , U300.
The control signals related to Backlight LED are given bellow.
Signals
LCD_LED_CTL
DISP_LIGHT
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.
Signals
PA_BAND
ANT_SW1
ANT_SW2
RF_PWR_DWN(GPO
CLKON
This pin determines whether the data to LCD module
Select 16bits interface mode for MAIN LCD.
Table 3-4: LCD Pin Description
Control LCD backlight level in 4 steps
Table 3-5. Description Of LCD Backlight LED Control
(GPO9)Antenna switch Band Select
(GPO11) Antenna switch Band Select
Description
MAIN LCD driver chip enable.
This pin resets LCD module.
Enable writing to LCD Driver.
Enable reading to LCD Driver.
data or control data.
Description
Current source for backlight LED
Description
(GPO17) PAM Band Select
4) Power down Input
RF LDO Enable/Disable
16