Key Baclklight Led Interface - LG -A290 Service Manual

3.15 KEY BACLKLIGHT LED Interface

Key Backlight LED is controlled by KEYPAD_LED signal of MT653.
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.
19-217_BHC-ZM1N2QY_3T
EDLH0015101
BLUE LED
KEYPAD_LED
LGE Internal Use Only
KEY BACKLIGHT
VBAT
C301
1u
LD300 LD301
C319
1u
Figure 3.15.1 Key Backlight Block
- 57 -
LD302 LD303 LD304 LD305
Copyright © 01 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
C300
1u
Only for training and service purposes