HT6240 Просмотр технического описания (PDF) - Holtek Semiconductor

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HT6240

Infrared Remote Encoder

Holtek Semiconductor 

HT6240-002

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

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

Transmission code

When the resonator is 455kHz, the carrier of the trans-

mission 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 cus-

tom 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 formation of the 1-word trans-

mission code. If a legal key is pressed, HT6240-002 will

send at least five words (see Fig. 8).

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

D0 D1

D2

D3

D4

D5

1 w o rd

5 0 .6 m s

Fig. 7 The formation of the 1-word transmission code

1 -w o rd

5 0 .6 m s

1 -w o rd

1 -w o rd

1 -w o rd

5 0 .6 m s

5 0 .6 m s

5 0 .6 m s

Fig. 8 A legal key will send at least five words

1 -w o rd

Rev. 1.30

6

November 6, 2002

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