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參數(shù)資料
| 型號(hào)： | HT6240-002 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | RES THICK FILM 100 OHM 1 W 7KV |
| 中文描述： | 紅外遙控編碼器 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 146K |
| 代理商： | HT6240-002 |
HT6240-002
7
December 16, 1999
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)andtheoutputpin(OSCO),(seeFig.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.
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 0000 0000 then
Fig. 5 shows the formation of the transmission
code. Fig. 6 shows the transmission code 0
and 1 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).
7 8 ' & % ) % &% <
% ! ! =%
! % / % &
$
$
Fig. 3
< !
2 < 0 !
< 1 !
Fig. 4 Carrier
< 1 !
< !
< 1 !
0 < !
> >
> >
Fig. 6 Transmission code 0 and 1 and
pulse width of HT6240-002
0
1
% % &
Fig. 5 Formation of the transmission code
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