HT6240-002(1999) データシートの表示（PDF） - Holtek Semiconductor

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HT6240-002
(Rev.:1999)

Infrared Remote Encoder

Holtek Semiconductor 

Clock oscillating circuit

HT6240 has built-in feedback resistor and

CMOS inverter, so a ceramic resonator can con-

nect between the oscillator circuit input pin

(OSCI) and the output pin (OSCO), (see Fig. 3).

When the ceramic resonator is set to 455kHz,

the carrier can be set 38kHz.

The oscillating circuit will stop when there is no

key pressed to save power dissipation.

H T 6 2 4 0 -0 0 2

O SCI

O SCO

C LI

C LO

HT6240-002

Transmission code

When the resonator is 455kHz, the carrier of

the transmission signal is 38kHz. One pulse

width is 0.53ms. Therefore, twenty 38kHz

clocks are included in the 0.53ms pulse width.

(Fig.4 shows the carrier)

HT6240-002 has two different formats. When

the custom code is equal to zero, CT will send

the 1st format. Otherwise, it will send the 2nd

format.

If the custom code (C0~C7) is ²0000 0000² then

Fig. 5 shows the formation of the transmission

code. Fig. 6 shows the transmission code ²0²

and ²1² and pulse width. Fig. 7 shows the for-

mation of the 1-word transmission code. If a le-

gal key is pressed, HT6240-002 will send at

least five words (see Fig. 8).

N o te : T h e s e c a p a c ito r s d e p e n d o n th e r e s o n a to r s .

U s e th e v a lu e s r e c o m m e n d e d b y th e r e s o n a to r

m a n u fa c tu re r.

Fig. 3

2 6 .4 m s

8 .8 m s

0 .5 3 m s

Fig. 4 Carrier

D0 D1 D2 D3 D4 D5

D a ta c o d e

Fig. 5 Formation of the transmission code

0 .5 3 m s

2 .1 1 m s

0 .5 3 m s

B it " 0 "

4 .2 2 m s

B it " 1 "

Fig. 6 Transmission code ²0² and ²1² and

pulse width of HT6240-002

7

December 16, 1999

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