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Only for training and service purposes
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3. TECHNICAL BRIEF
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
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3.14 KEY BACLKLIGHT LED Interface
Key Backlight LED is controlled by switch (Q401). If KEY_BL_EN is high, Current is flowing from VBAT to
LED. Then Light emitted from The LED.
KEY_BL_EN is operating PWM. It is reducing current consumption.
Figure 3-14-1 Key Backlight Block
3. TECHNICAL BRIEF
LD408 LD406 LD403 LD407 LD404 LD405 LD409 LD410 LD411 LD414 LD413 LD412
D401
0
51
104R
LD401
Q401
1
2
3
K001
844R
LD402
VBAT
smh
o
051
03
4
R
smh
o
051
1
3
4
R
2
34
R
s
m
ho0
5
1
3
34
R
smh
o
051
smh
o
051
4
34
R
smho051
534R
smho051
6
34
R
smho051
734R
smho051
834R
smho051
934R
s
mho051
044R
144R
smho051
244R
smho051
1.2K
R447
0.1u
C431
KEY_BL_EN
Figure 3-14-1 Key Backlight Block