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3. H/W CIRCUIT DESCRIPTION
1
K
B
( R
) 1
1
K
B
( R
) 2
1
K
B
( R
) 3
1
K
B
( R
) 4
1
K
B
( R
) 0
K
B
( C
) 0
K
B
( C
) 1
K
B
( C
) 2
K
B
( C
) 3
K
B
( C
) 4
3.5.13 Keypad back-light Illumination
There are 12 Deep Blue LEDs in Main Board for Keypad Backlight.
Keypad Back-light is driven by 'LEDB' line from IOTA .
C
A
M
S
D I
E
C
A
M
E
R
A
C
C
N
3
0
A
V
L
5
M
0
2
2 -
0
0
V
A
3
0
7
1
2
1
2
1
2
K
B
1
K
B
2
K
B
3
C
A
M
2
1
2
1
2
1
F
1
K
B
4
K
B
5
K
B
6
1
1
1
2
2
2
K
B
7
K
B
8
K
B
9
F
2
1
1
2
2
1
2
S
T
A
R
K
B
0
S
E
N
D
S
H
A
R
P
1
1
1
2
2
2
L
E
F
T
R
G I
H
T
U
P
D
O
W
Figure 18. Keypad Scanning Scheme
V
B
A
T
K
E
Y
L
E
D
B
V
A
3
0
6
Figure 19. Keypad Back-light Scheme
- 36 -
K
E
Y
A
M
E
R
A
_
R
O
W
0
3
V
A
3
0
8
A
V
L
5
M
0
2
2 -
0
0
2
2
1
C
L
E
A
R
P
W
O
N
2
2
2
1
2
F
3
1
2
K
B
( R
) 2
2
N
O
K
K
B
( R
) 3
K
B
( C
) 4
V
A
3
0
1
A
V
L
5
M
B
A
C
K
L
G I
H
T
R
3
1
6
2
0
R
3
1
8
2
0
K
E
Y
P
A
D
E
N
D
1
2
E
N
D
V
A
3
0
4
3
V
O
L
_
U
P
V
O
L
_
D
O
W
N
2
1
V
O
L
_
R
O
W
0
C
N
3
0
4
V
A
3
0
2
V
A
3
0
3
A
0
V
2
L
2 -
5
0
M
0
0
A
2
V
2 -
L
5
0
M
0
0
2
2 -
0
0
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