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HT6240 Datasheet(PDF) 7 Page - Holtek Semiconductor Inc

Part # HT6240
Description  Infrared Remote Encoder
Download  16 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT6240 Datasheet(HTML) 7 Page - Holtek Semiconductor Inc

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HT6240-002
Rev. 1.30
7
November 6, 2002
On table 2, the relationship between the key matrix and
the transmission code is shown when custom
code=
²0000 0000². The asterisks means that
HT6240-002 can just send five words at a time even if a
legal key is pressed for a long time. The others mean
that HT6240-002 will send five or six words, even some
more words if a legal key is still pressed.
Table 2
OF0 OF1 OF2 OF3 OF4 OF5 OF6 OF7
IE0
00
04
08
0C
10*
14*
18*
1C*
IE1
01
05
09*
0D*
11*
15*
19*
1D*
IE2
02
06
0A*
0E*
12*
16*
1A*
1E*
IE3
03
07
0B*
0F*
13*
17*
1B*
1F*
There are 64 instructions when the custom code=
²0000
0000
² in HT6240-002. The transmission output CT is
still
²L² and the transmission code will not be sent when
two or more keys are pressed simultaneously.
If custom code
¹²0000 0000² then Fig. 9 shows the for-
mation of the transmission code. The transmission code
consists of a head pulse, 8-bit custom code and 8-bit
data code. Fig. 10 shows bit
²0² and bit ²1².
The formation of a 1-word transmission code without
carrier is shown in detail in Fig.11. Output CT should
combine with the carrier when CT is high.
CT will send at least three words if we press a legal key.
CT may send three or four words, or several words de-
pending on the length of time the legal key is pressed.
(see Fig. 12)
Power on reset function (PRB)
The power on reset function can be activated by con-
necting a capacitor to PRB pin while power is applied.
The time (tC) must be longer than 0.1ms when the volt-
age in PRB pin (VC) becomes higher than 0.3VDD after
the voltage in VDD pin exceeds 2.2V.
When the power on reset function is activated, the
standby state continues until an
²L² is input to IE0~IE3.
8 . 4 4 m s
H e a d p u l s e
4 . 2 2 m s
4 . 2 2 m s
C 0 C 1 C 2 C 3 C 4 C 5 C 6 C 7
D 0 D 1 D 2 D 3 D 4 D 5 D 6 D 7
C u s t o m c o d e
D a t a c o d e
Fig. 9 The formation of the transmission code when custom code
¹²0000 0000²
0 . 5 3 m s
1 . 0 6 m s
0 . 5 3 m s
2 . 1 1 m s
B i t " 0 "
B i t " 1 "
Fig. 10
8 . 4 4 m s
4 . 2 2 m s
H e a d p u l s e
C u s t o m c o d e
C 0 = 0
D a t a c o d e
C 1 = 1
C 2 = 1 C 3 = 0 C 4 = 0 C 5 = 0 C 6 = 0 C 7 = 0
D 0 = 0 D 1 = 0 D 2 = 0 D 3 = 0 D 4 = 1 D 5 = 0 D 6 = 0 D 7 = 0
4 . 2 2 m s
1 - w o r d
Fig. 11


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