LG C1100 Service Manual page 21

3. TECHNICAL BRIEF
3.5.1 Interconnection with external devices
A. RTC Block Interface
Countered by external X-TAL
The X-TAL oscillates 32.768KHz
B. LCD module interface
The LCD module is controlled by DBB chipset, AD6525.
When LCD operate, the AD6525 controls the LCD module through LCD_CS, LCD_RESET,
ADD01, WR, DATA[00-15]. LCD_ID, LCD_RESET
Signals
LCD_CS
LCD_RESET
ADD1(RS)
WR
DATA
2V8_VMEM
LCD_BACKLIGHT
DATA[00-15]
C. RF Interface
The AD6525 control RF parts through PA_BAND, ANT_SW1, ANT_SW2, CLKON , PA_EN,
S_EN, S_DATA, S_CLK, RF_PWR_DWN
GPO
17
9
11
-
16
19
20
21
4
Table 3-3. LCD module interface
Description
MAIN LCD driver chip enable. MAIN LCD driver IC has own CS pin
This pin resets LCD module.
This pin determines whether the data to LCD module are display data
or control data. ADD1 can select 16 bit parallel bus. ADD1 is also
used to address flash memory.
Write control. The phone do not read data from LCD chip.
Parallel data lines. Color LCD driver chip uses the 16-bit data
interface.
3V voltage is supplied to white colored LED driver for backlighting.
Control signal of white LED driver IC.
Parallel data lines, Sub LCD driver chip uses the 8-bit data in reface.
Table 3-4. RF CONTROL SIGNALS DISCRIPTION
Signal Name
PA_BAND
ANT_SW1
ANT_SW2
CLKON
PA_EN
S_EN
S_DATA
S_CLK
RF_PWER_DWN
- 20 -
Description
PAM Band Select
Antenna Switch Band Select
Antenna Switch Band Select
RF LDO Enable/Disable
PAM Enable/Disable
PLL Enable/Disable
Serial Data to PLL
Clock to PLL
Powerdown Input