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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. BB Circuit Technical brief
GW520 service manual
3.9 Keypad switching & scanning
The keypad interface is a peripheral which can be used for scanning keypads up to 8 rows and 8
columns . U400(key encoder) supports the key canning process.
[Figure 3.9-1] Qwerty key circuit diagram
27p
EVLC5S0250
VA402
C417
VA401
EVLC5S0250
0.1u
C403
C415
27p
2V62_VIO
1u
C410
R425
DNI
470
R401
4.7K
R418
C408
27p
EVLC5S0250
VA400
C404
0.1u
R400
120K
R402
4.7K
C416
27p
27p
C414
C413
C412
27p
27p
P51
11
P52
P53
10
9
P54
P55
5
P56
4
3
P57
PGND
29
RESETB
27
2
SEL_28P
1
TEST
23
VDD
26
XI
XO
25
CLK_SEL
24
GND1
8
GND2
28
P10
22
7
P15
P17
6
21
P40
P41
20
P42
19
P43
18
17
P44
P45
16
P46
15
14
P47
13
P50
12
EUSY0300004
PP2106M2
U400
27p
C407
C418
27p
470
R404
R419
470
470
R407
R429
470
DNI
C411
C419
27p
R411
470
2V62_VIO
R428
470
470
R422
470
R415
470
R410
27p
C409
R414
470
470
R432
470
R431
R430
470
KEY_INT
KEY_I2C_SCL
KEY_I2C_SDA
KEY_ROW0
KEY_ROW1
KEY_ROW2
KEY_ROW3
KEY_ROW4
KEY_ROW5
KEY_COL4
KEY_COL3
KEY_COL2
KEY_COL1
KEY_COL0
KEY_COL7
KEY_COL6
KEY_COL5
Sym
Z(7)
Multi
End
Touch
Shutter
Vol_Down
Lock
Vol_Up
KEY_ROW5
Send
X(8)
? (#, )
( High state )
Cam
( Low state )
DOT
C
L
D
N
T
I
E
M
J
P
R
Y
UP
A
O
FN
COMMA
RIGHT
SPACE
K
G
S
BACK
QUES
LEFT
X
ENTER
B
SHIFT
V
F
DOWN
U
W
H
Q
MESSAGE
Z
Sym
KEY_COL2
KEY_COL1
KEY_COL0
KEY_ROW4
KEY_ROW0
KEY_COL7
KEY_ROW1
KEY_COL4
KEY_COL3
KEY_ROW3
KEY_ROW2
KEY_COL5
KEY_COL6
Содержание GW520
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