HT6240-002 Ver la hoja de datos (PDF) - Holtek Semiconductor
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HT6240-002 Datasheet PDF : 16 Pages
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HT6240-002
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
0000² 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 ¹ ²0000 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 ls e
4 .2 2 m s
4 .2 2 m s
C0C1 C2 C3 C4 C5 C6 C7
C u s to m c o d e
D0 D1 D2 D3 D4 D5 D6 D7
D a ta c o d e
Fig. 9 The formation of the transmission code when custom code ¹ ²0000 0000²
0 .5 3 m s
1 .0 6 m s
0 .5 3 m s
B it " 0 "
2 .1 1 m s
B it " 1 "
Fig. 10
H e a d p u ls e
8 .4 4 m s
C 0=0 C 1=1
C u s to m c o d e
C 2=1 C 3=0C 4=0C 5=0C 6=0C 7=0
D a ta c o d e
D 0=0 D 1=0 D 2=0 D 3=0 D 4=1 D 5=0D 6=0 D 7=0
4 .2 2 m s
1 -w o rd
Fig. 11
4 .2 2 m s
Rev. 1.30
7
November 6, 2002
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