LG KG110 - Key Back-Light Illumination

3. TECHNICAL BRIEF
25
3.3.9 Key Back-light Illumination
In key back-light illumination, there are 6 Blue LEDs in Main Board, which are driven by
KEY_BACKLIGHT signal from AD6720.
Figure 3-11: Headset Jack Interface
Figure 3-12: Key Backlight Illumination
VMICVMEM
VMEM
VMEM
VMIC_N VMEM VMEM
VMIC_ON
HEADSET_MIC_P
HOOK_DETECT
HEADSET_SPK_P
JACK_DETECT
C231
39p
R233
0
R231
100K
R235
NA
R232
0
C233
39P
IN
1
GND
3
NC
4
NO
6
VCC
2
COM
5
U204
NLAST4599DFT2G
R238
NA
R236
1K
+
C234
10u
C235
39P
R237
2.2K
R234
1M
4
3
1
52
+
-
OUT
VIN-
VIN+
U205
LMV7291MGX-NOPB
R240
510K
C232
39P
R239 0
1
3
4
2
5
J200
R243 4.7
SP204
.
VA204
AVL5M02-200
C237
39P
R242 0
R244
33K
C236 10u R241 4.7
C238
39P
SP203
.
VA203
AVL5M02-200
EAR JACK
VCC
GND
LD206
LEBB-S14H
R226
220
C226 1u
KEYBOARD_BACKLIGHT
VBAT
LD201
LEBB-S14H
R221
220
LD202
LEBB-S14H
R222
220
C222 1u
LD203
LEBB-S14H
R223
220
C223 1u C221 1u
LD204
LEBB-S14H
R224
220
C224 1u
LD205
LEBB-S14H
R225
220
C225 1u
KEY BACKLIGHT
(6 LIGHT)