Keypad Switching & Scanning - LG GT350 Service Manual

3.8 Keypad Switching & Scanning
The keypad is controlled by a Key coder IC (PP2106M3). It can be used for scanning keypads up to 8 rows and
8 columns (max 64 keys). PMB8877 control PP2106M3 by KEY_I2C_SCL, KEY_I2C_SDA and KEY_INT.
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
QWERTY KEY
2V62_VIO
C429
100n
1
2
R425 470
3
KEY_COL7
R411 470
4
KEY_COL6
R419 470
5
KEY_COL5
R401 0
6
KEY_INT
R402 0
7
KEY_I2C_SCL
R409
4.7K
C433
C421
C425
C430
C432
Q
W E
KB444 KB443 KB442
KEY_ROW0
A S D
KB441 KB440 KB437
KEY_ROW1
` Z X
KB433 KB420 KB417
KEY_ROW2
Fn1 Shift
MSG
KB402 KB411 KB413
KEY_ROW3
O P @
KB423 KB405 KB427
KEY_ROW4
Up Left Right
KB418 KB414 KB407
KEY_ROW5
C406
27p CAM Vol_UP Vol_DOWN
KEY_ROW6
KEY_COL0
C413
C407
27p
27p
KEY_COL1
KEY_COL2
KEY_COL3
KEY_COL4
KEY_COL5
KEY_COL6
KEY_COL7
Figure 10 Key pad part key matrix
2V62_VIO
2V62_VIO
C435
100n
R424
120K R422
R426
0
(1%)
4.7K
R407
21
TEST P40
R410
20
SEL_28P P41
R413
19
P57 P42
U401 R414
18
P56 P43
PP2106M2
R418
17
P55 EUSY0300004 P44
R420
16
P17 P45
R421
15
P15 P46
27p
27p
27p
27p
27p
R T Y U
KB403 KB415 KB421 KB412
F
G H J
KB429 KB428 KB422 KB431
V
C B N
KB445 KB446 KB447 KB438
Space
KB401
Push @
Sym IM
KB408 KB409 KB410 KB419
Enter
KB404
L CLR .
KB436 KB435 KB434 KB432
Fn2
Down
KB424 KB425
SEND MULTI END
C410 C411
C412
27p
27p
27p
- 41 -
3. TECHNICAL BRIEF
470
KEY_ROW0
470
KEY_ROW1
470
KEY_ROW2
470
KEY_ROW3
470
KEY_ROW4
470
KEY_ROW5
470
KEY_ROW6
I
KB416
K
KB430
M
KB439
Browser
KB406
SNS
KB426
POWER&LOCK
LGE Internal Use Only