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3.1.13 KeyPad, Touch button and Touch screen
There are 7 buttons and QWERTY keypad. Shows the Keypad circuit. 'ONSW' Key is also connected to
AB3100. QWERTY encoder IC is PP2106M2, which generates hex code when QWERTY key is pressed.
Touch screen driver IC is ISC2007IYZGR. When Touch screen is touched, Interrupt is given to DB3200
and DB3200 reads the status register.
KEYOUT0
KEYIN0
Volume UP
KEYIN1
Volume DOWN
KEYIN2
KEYIN3
KEYIN4
KEYIN5
KEYIN6
K
E
Y
N I
2
K
E
Y
N I
3
A
P
P
_
G
P
_
K
E
Y
E
N
C
O
D
E
_
R
S
T
_
2
V
7
A
P
P
_
G
P
_
K
E
Y
E
N
C
O
D
E
_
S
D
A
_
2
V
7
5
A
P
P
_
G
P
_
K
E
Y
E
N
C
O
D
E
_
S
C
L
_
2
V
7
A
P
P
_
G
P
_
K
E
Y
E
N
C
O
D
E
_
N I
T
_
2
V
7
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
KEYOUT1
SEND
MULTI
Table 3-1-8. Key Matrix Mapping Table
C
N
6
0
1
4
H
O
L
D
3
C
A
M
2
1
Figure 3-1-13. KEY CIRCUIT
5
C
8
2
7
1
u
0
R
8
3
5
5
0
R
8
3
6
5
Figure 3-1-14. QWERTY encoder
KEYOUT2
KEYOUT3
V
D
D
H
_
2
V
7
5
1
%
1
2
1
T
E
S
T
P
4
0
2
2
0
S
E
L
_
2
8
P
P
4
1
3
1
9
P
5
7
P
4
2
4
1
8
P
5
6
U
8
0
8
P
4
3
5
1
7
P
5
5
P
P
2
1
0
6
M
2
P
4
4
6
1
6
P
1
7
P
4
5
7
1
5
P
1
5
P
4
6
- 37 -
3. TECHNICAL BRIEF
KEYOUT4
GND
ONSW
HOLD
CAMERA
R
8
9
9
1
0
0
o
h
m
K
E
Y
_
R
8
9
8
1
0
0
o
h
m
K
E
Y
_
R
8
9
7
1
0
0
o
h
m
K
E
Y
_
R
8
9
6
1
0
0
o
h
m
K
E
Y
_
R
8
9
5
1
0
0
o
h
m
K
E
Y
_
R
8
9
4
1
0
0
o
h
m
K
E
Y
_
R
8
9
3
1
0
0
o
h
m
K
E
Y
_
R
8
9
2
1
0
0
o
h
m
K
E
Y
_
R
8
9
1
1
0
0
o
h
m
K
E
Y
R
8
9
0
1
0
0
o
h
m
K
E
Y
R
8
8
9
1
0
0
o
h
m
K
E
Y
R
8
8
8
1
0
0
o
h
m
K
E
Y
R
8
8
7
1
0
0
o
h
m
K
E
Y
R
8
8
6
1
0
0
o
h
m
K
E
Y
LGE Internal Use Only
R
O
W
0
R
O
W
1
R
O
W
2
R
O
W
3
R
O
W
4
R
O
W
5
R
O
W
6
R
O
W
7
_
C
O
L
0
_
C
O
L
1
_
C
O
L
2
_
C
O
L
3
_
C
O
L
4
_
C
O
L
5
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