LG F7100, Service Manual

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3. TECHNICAL BRIEF
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(2) Interconnection with external devices
A. RTC Block Interface
Countered by external crystal oscillator (MC-146, X101).
The X-tal oscillates 32.768 KHz.
B. LCD Module Interface
Controlled by LCD_CS, LCD_RES, ADD01, WR, DATA[0:15], DIM_CNTL, and LCD_ID.
C. RF Interface
The AD6525 control RF parts through RF_EN, ANT_SW1/2, PA_EN, PA_BAND, RF_PWR_DWN,
S_EN, S_DATA, AND S_CLK.
Description
LCD_CS LCD driver chip enable. LCD driver IC has own CS pin
LCD_RES This pin resets LCD module.
ADD01
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.
WR Write control.
DATA[0:15] Parallel data lines. Color LCD driver chip uses the 16 bit data
interface.
LCD_BL Control signal for white LED(LCD backlight) driver IC.
LCD_ID Reserved for future use.
Table 3-3 LCD module interface
GPO Signal Name Description
4 RF_EN RF Enable / Disable
9 ANT_SW1 Antenna Switch Band Select
11 ANT_SW2 Antenna Switch Band Select
16 PA_EN PAM Enable / Disable
17 PA_BAND PAM Band Select
18 RF_PWR_DWN Power Down Input
19 S_EN Serial Enable Input
20 S_DATA Serial Data Input
21 S_CLK Serial Clock Input
Table 3-4 RF interface