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3. TECHNICAL BRIEF
2
1
EDLH0013401
LD400
A
C
4.7
R408
DNI
VA405
DNI
VA404
VBAT
LD401
EDLH0013401
2
1
A
C
R407
4.7
KEYPAD_LED
3.14 KEY BACLKLIGHT LED Interface
Key Backlight LED is controlled by KEYPAD_LED signal of MT625.
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.
Figure 3.14.1 Key Backlight Block