Application Circuits

DTMF Receiver Single-ended Input Application Circuit

HT95R43/HT95R44

Rev. 1.00

6

March 31, 2010

K e y M a t r i x

3 0 0 k W

0 . 1 m F

I / O

I / O

2

5

8

0

3

6

9

#

1

4

7

* / T

K e y 1

K e y 2

K e y 3

K e y 4

K e y 5

K e y 6

K e y 7

K e y 8

K e y 9

K e y 1 0

K e y 1 1

K e y 1 2

D T M F

V P

V N

G S

V R E F

R T / G T

E S T

X 1

X 2

3 2 7 6 8 H z

X C

3 n F

4 7 n F

1 5 k W

V S S

T M R 1

T M R 0

I N T

H K S

H F I

H D I

T e l e p h o n e C i r c u i t a n d S p e e c h N e t w o r k

5 . 1 V

1 0 0 m F

0 . 1 m F

D T M F

V D D

1 0 0 k W

0 . 1 m F

R E S

D T M F O u t p u t

P C 1 ~ P C 4 , P C 6

P C 0

P C 5

P C 7

0 . 1 m F

E x t r a I / O

I n t e r r u p t

I / O

M E M O R Y

D I A L I N G

S T O R E

H O L D

A M

P M

A B R

M O N

T U E

W E D

T H R

F R I S A T

S U N

L C D P a n n e l

H T 1 6 2 x

1 0 0 k W

1 0 0 k W

C P T V R E F

C P T S I N

+

-

0 . 0 1 m F 1 0 0 k W

0 . 0 1 m F 1 0 0 k W

1 0 0 k W

0 . 1 m F

2 0 p F

4 7 0 k W

1 0 0 k W

T I P

R I N G

I / O

I / O

C P T E N V

C P T E N

C P T X 1

C P T X 2

3 2 7 6 8 H z