Valid single-key input

Valid double-key input

HT6221/HT6222

10

March 2, 2000

Kn

36m s

DO UT

(a )

K n I nput

Kn

36m s

DO UT

( b )

t < 108 m s

108m s

t > 1 0 8 m s

K n c ode t r ans m i s s i on

K n c ode t r ans m i s s i on

K n I nput

Note: Kn can be one of K1~K64

K 21 I npu t

t > 1 2 6 m s

K m In p u t

K2 1

36m s

36 m s

108m s ( m i n . )

DO UT

Km

K 21 c ode t r an s m i s s i on

K 21+ K m c ode

t r ans m i s s i on

Note: Km can be one of K22~K24

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.