Block Diagram

Pin Assignment

HT1647A

Rev. 1.40

2

April 29, 2011

PATENTED

W a t c h d o g T i m e r

&

T i m e B a s e G e n e r a t o r

D i s p l a y R A M

L C D D r i v e r /

B i a s C i r c u i t

C o n t r o l

&

T i m i n g

C i r c u i t

W R

O S C I

C S

R D

C O M 0

C O M 1 5

S E G 0

S E G 6 3

T o n e F r e q u e n c y

G e n e r a t o r

B Z

B Z

I R Q

V S S

V D D

V L C D

O S C O

D B 0

D B 3

N o t e : C S : C h i p s e l e c t i o n

B Z , B Z : T o n e o u t p u t s

W R , R D : W R I T E c l o c k , R E A D c l o c k

D B 0 ~ D B 3 : D a t a b u s

C O M 0 ~ C O M 1 5 , S E G 0 ~ S E G 6 3 : L C D o u t p u t s

I R Q : T i m e b a s e o r W D T o v e r f l o w o u t p u t

H T 1 6 4 7 A

1 0 0 L Q F P - A

C S

R D

W R

D B 0

D B 1

D B 2

D B 3

V S S

O S C I

O S C O

V D D

V L C D

I R Q

B Z

B Z

T 1

T 2

T 3

T 4

N C

C O M 0

C O M 1

C O M 2

C O M 3

C O M 4

3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 4 0 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 5 0

8 1

8 2

8 3

8 4

8 5

8 6

8 7

8 8

8 9

9 0

9 1

9 2

9 3

9 4

9 5

9 6

9 7

9 8

9 9

1 0 0

8 0 7 9 7 8 7 7 7 67 5

7 4

7 3

7 2

7 1

7 0

6 9

6 8

6 7

6 6

6 5

6 4

6 3

6 2

6 1

6 0

5 9

5 8

5 7

5 6

5 5

5 4

5 3

5 2

5 1

1

2

3

4

5

6

7

8

9

1 0

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 8

1 9

2 0

2 1

2 2

2 3

2 4

2 5

2 6 2 7 2 8 2 9 3 0

S E G 3 8

S E G 3 7

S E G 3 6

S E G 3 5

S E G 3 4

S E G 3 3

S E G 3 2

S E G 3 1

S E G 3 0

S E G 2 9

S E G 2 8

S E G 2 7

S E G 2 6

S E G 2 5

S E G 2 4

S E G 2 3

S E G 2 2

S E G 2 1

S E G 2 0

S E G 1 9

S E G 1 8

S E G 1 7

S E G 1 6

S E G 1 5

S E G 1 4