LG KG920 Service Manual page 31

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 AD6527 and MV8620.
In operating mode, the AD6527 controls the LCD module through LCD_CS, LCD_RS,
L_DATA[15:00], LCD_BACKLIGT, LCD_RESET, LCD_WR, 2V8_MM.
Signals
LCD_CS
LCD_RESET(GPIO 15)
LCD_RS
L_DATA[15:00]
LCD_WR
2V8_MM
LCD_BACKLIGHT
(GPO_23)
CHARGE PUMP
VMLED
(GPIO_23)
LCD_BACKLIGHT
LCD driver IC chip enable.
This pin resets LCD driver IC.
This pin select Command or Data.
The pins carry LCD data.
LCD data write enable signal.
2.8V voltage is supplied to LCD driver IC.
This pin controls LCD backlight level.
Table 3-2. LCD CONTRON SIGNALS DISCRIPTION
VBAT
FB402
R414
1K
C409 C412 C410
1u 27p
Figure 3-8.
- 32 -
Description
U405 AAT3152IWP
8 3
IN C1+
5 4
OUTCP C1-
6
C2+
2
EN_SET
7
C2-
FB403
10
ISINK1
FB404
11
ISINK2
FB405
9 12
GND ISINK3
13 1
1u PGND ISINK4
C407
1u
C408
1u
MLED1
MLED2
MLED3
VMLED