3. TECHNICAL BRIEF
- 51 -
Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
/ 131
Figure 3.14.1 Key Backlight Block
3. TECHNICAL BRIEF
3.14 KEY BACLKLIGHT LED Interface
Key Backlight LED is controlled by KEYPAD_LED signal of MT6255.
The built-in open drain output switch drives the Keypad LED in the handset. This switch is controlled by
baseband with the enable register. The keypad LED can sink 150mA and will become high impedance as
disabled.
52
3.14 KEY BACLKLIGHT LED Interface
Figure 3.14.1 Key Backlight Block
R357
47
R360
47
47
R361
R363
47
47
R362
47
R364
LD300
LD301
LD302
LD303
LD304
LD305
1u
C319
VBAT
1u
C300
1
2
C301
1u
1
2
KEY_BL0
Changed (8/8)
WHITE Top View LED (8/13)
KEY BACKLIGHT