HT6240-002(1999) Просмотр технического описания (PDF) - Holtek Semiconductor

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HT6240-002
(Rev.:1999)

Infrared Remote Encoder

Holtek Semiconductor 

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*

HT6240-002

There are 64 instructions when the custom

code=²0000 0000² in HT6240-002. The trans-

mission output CT is still ²L² and the transmis-

sion code will not be sent when two or more keys

are pressed simultaneously.

If custom code ¹ ²0000 0000² then Fig. 9 shows

the formation 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.

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

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

5 0 .6 m s

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

1 -w o rd

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

8

December 16, 1999

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