3. TECHNICAL BRIEF
- 45 -
3.10. LCD back-light illumination
Employed the AAT2806 is a dual charge pump designed to support both the white LED backlight and
flash applications for systems operating with lithium-ion/polymer batteries. The backlight charge pump
is capable of driving up to four LEDs at a total of 80mA. The current sinks may be operated individually
or in parallel for driving higher current LEDs. To maximize power efficiency, the charge pump operates
in 1X, 1.5X, or 2X mode, where the mode of operation is automatically selected by comparing the
forward voltage of each LED with the input voltage.
The interface relies on the number of rising edges of the EN/SET pin to address and load the registers.
S2Cwire latches data or address after the EN/SET pin has been held high for time TLAT. The interface
records rising edges of the EN/SET pin and decodes them into 16 different states, as indicated in table
Figure 15 LCD Back light unit and Flash LED charge pump IC
100K
R130
C132
1u
1u
C131
C134
1u
1u
C133
100K
R131
C136
1u
VBAT
GND
5
ISINK1
6
ISINK2
ISINK3
7
ISINK4
8
PGND
17
4
VIN
13
VOUT_BL
3
VOUT_FL
AAT2806IXN-4.5-T1
U108
11
C1+
C1-
12
C2+
14
15
C2-
2
C3+
C3-
1
EN_FLSH
16
EN_SET
10
9
C135
1u
MLED
MLED4
MLED3
MLED2
MLED1
FLASH_EN
FLASH_LED
LCD_BACKLIGHT
Содержание Prada KE850
Страница 1: ...Date March 2007 Issue 1 0 Service Manual Model KE850 Service Manual KE850 ...
Страница 3: ... 4 ...
Страница 5: ... 6 ...
Страница 70: ...4 PCB layout 71 4 PCB layout 4 1 Main Sub PCB component placement Main PCB Top Main PCB Top placement ...
Страница 71: ...4 PCB layout 72 Main PCB bottom Main PCB bottom placement ...
Страница 115: ... 116 6 Download S W upgrade 6 Press the START button ...
Страница 116: ... 117 6 Download S W upgrade 7 Stand by condition Wait is displayed connect the Phone KE850 KE850P40 7 V09a ...
Страница 117: ...6 Download S W upgrade 118 KE850 KE850P40 7 V09a KE850 KE850P40 7 V09a ...
Страница 127: ... 128 LGMC 8 pcb layout ...
Страница 128: ... 129 LGMC 8 pcb layout ...
Страница 129: ... 130 LGMC 8 pcb layout ...
Страница 130: ... 131 LGMC 8 pcb layout ...
Страница 131: ... 132 8 pcb layout ...
Страница 132: ... 133 8 pcb layout ...
Страница 133: ... 134 8 pcb layout ...
Страница 134: ... 135 8 pcb layout ...
Страница 135: ... 136 8 pcb layout ...
Страница 136: ... 137 8 pcb layout ...
Страница 137: ... 138 ...
Страница 139: ...9 RF Calibration 140 9 2 3 Click SETTING Menu 9 2 4 Setup Ezlooks menu such as the following figure ...
Страница 141: ...9 RF Calibration 142 9 2 7 Select MODEL 9 2 8 Click START for RF calibration 9 2 9 RF Calibration finishes ...
Страница 142: ...9 RF Calibration 143 9 2 10 Calibration data will be saved to the following folder Saving format year month day PASS ...
Страница 149: ... 150 ...
Страница 151: ... 152 ...
Страница 172: ...Note ...
Страница 173: ...Note ...