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3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.9 Keypad Switching & Scanning
The keypad is controlled by a Key coder IC (PP2106M2). It can be used for scanning keypads up to 8
rows and 8 columns (max 64 keys). PMB8888 control PP2106M2 by KEY_I2C_SCL, KEY_I2C_SDA
and KEY_INT.
Figure 11-1. Keypad Configuration Circuit
(1%)
QWERTY KEY
4.7K
R415
R418
470
R410
470
470
R404
2V62_VIO
R403
470
470
R412
R411
0
C417
27p
27p
C402
C423
27p
C404
27p
27p
C415
C401
0.1uF
C416
C414
27p
27p
C418
27p
470
R409
R414
470
TEST
23
VDD
26
XI
XO
25
R406
470
18
17
P44
P45
16
P46
15
14
P47
13
P50
12
P51
11
P52
P53
10
9
P54
P55
5
P56
4
3
P57
PGND
29
RESETB
27
2
SEL_28P
1
PP2106M2
CLK_SEL
24
GND1
8
GND2
28
P10
22
7
P15
P17
6
21
P40
P41
20
P42
19
P43
U400
R401
0
2V62_VIO
120K
R400
0.1uF
C400
470
R416
R417
470
470
R419
27p
C422
C403
27p
470
R405
R402
4.7K
2V62_VIO
C419
27p
R407
470
C420
27p
27p
C421
2V62_VIO
0
R413
27p
C424
C413
27p
470
R420
470
R408
KEY_ROW4
KEY_COL4
KEY_COL2
KEY_COL0
KEY_COL7
KEY_COL5
KEY_ROW1
KEY_ROW3
KEY_I2C_SDA
KEY_I2C_SCL
KEY_INT
KEY_ROW5
KEY_COL3
KEY_COL1
KEY_COL6
KEY_ROW6
KEY_ROW0
KEY_ROW2
Содержание GT360
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