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5-1
KEY BOARD
TABLE OF CONTENTS
IC Block Diagram ........................................................................ 8-1
Circuit Diagram ........................................................................... 8-2
Layout Diagram-Component ...................................................... 8-3
Layout Diagram-SMD ................................................................. 8-3
Electrical parts list ...................................................................... 8-4
5-1
Block Diagram
O S C I
C S
C o n t r o l
a n d
R D
T i m i n g
W R
C i r c u i t
D A T A
V D D
V S S
W a t c h d o g T i m e r
B Z
T o n e F r e q u e n c y
G e n e r a t o r
T i m e B a s e G e n e r a t o r
B Z
Pin Assignment
C S
1
N C
2
R D
3
W R
4
D A T A
5
V S S
6
O S C I
7
V D D
8
0 6 $
V L C D
9
$ " 3 . 2
I R Q
1 0
B Z
1 1
N C
1 2
B Z
1 3
T 1
1 4
T 2
1 5
T 3
1 6
C O M 0
1 7
C O M 1
1 8
N C
1 9
2
HT1622
D i s p l a y R A M
C O M 0
C O M 7
L C D D r i v e r /
B i a s C i r c u i t
S E G 0
S E G 3 1
V L C D
a n d
I R Q
5 1
N C
5 0
N C
4 9
N C
4 8
S E G 1 9
S E G 1 8
4 7
4 6
S E G 1 7
4 5
S E G 1 6
4 4
S E G 1 5
4 3
S E G 1 4
4 2
S E G 1 3
4 1
S E G 1 2
4 0
S E G 1 1
3 9
S E G 1 0
3 8
S E G 9
3 7
S E G 8
3 6
S E G 7
3 5
N C
3 4
N C
3 3
N C
January 10, 2001
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