Application Circuits

Application Circuit 1

Note: Typical infrared diode: EL-1L2 (KODENSHI CORP.)

HT6221/HT6222

Rev. 1.50

9

October 1, 2007

K 2 1 I n p u t

t > 1 2 6 m s

K m I n p u t

K 2 1

3 6 m s

3 6 m s

1 0 8 m s ( m i n . )

D O U T

K m

K 2 1 c o d e t r a n s m i s s i o n

K 2 1 + K m c o d e

t r a n s m i s s i o n

Note: Km can be one of K22~K24

Valid double-key input

DOUT and LED

After the transmission codes are sent, the DOUT pin generates transmission codes with a carrier, and the LED goes

low to drive a transmission indicator.

H T 6 2 2 1

D 7

V S S

1 0

7

5

C 1

C 2

C 3

C 4

C 5

5 1 k W ´ 8

1 N 4 1 4 8 ´ 8

C 6

C 7

C 8

R 1

R 2

R 3

R 4

A I N

K 1

K 2

K 3

K 4

K 5

K 6

K 7

K 8

K 9

K 1 0

K 1 1

K 1 2

K 1 3

K 1 4

K 1 5

K 1 6

K 1 7

K 1 8

K 1 9

K 2 0

K 2 1

K 2 2

K 2 3

K 2 4

K 2 5

K 2 6

K 2 7

K 2 8

K 2 9

K 3 0

K 3 1

K 3 2

D O U T

L E D

V D D

8 0 5 0

1 . 8 V ~ 3 . 5 V

3 3 0 W

4 7 m F / 1 6 V

1 k W

I n f r a r e d

4 7 W

1 1

6

X 1

X 2

4 5 5 k H z

c e r a m i c r e s o n a t o r

8

9

1 0 0 p F

1 0 0 p F

1 9

1 8

1 7

1 6

1 5

1 4

1 3

1 2

1

2

3

4

2 0

L E D