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

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HT6240-002
(Rev.:1999)

Infrared Remote Encoder

Holtek Semiconductor 

HT6240-002

Functional Description

Key operation

The input pins (IE0~IE3) and the output pins

(OF0~OF7) constitute a max. of 4´8 key matrix

which is also called standard key. The extended

key is formed by input pin DATA and the scan

output (OF5~OF7). The 4´8 key matrix and the

extended key can transmit a max. of 256 in-

struction.

CT maintains ²L² and no transmission code is

generated when two or more keys in standard

key are pressed.

Table 1 shows the relationship between the key

matrix and the transmission code.

Table 1

Transmission Code

Key Input

D1

D0

IE0

0

0

IE1

0

1

IE2

1

0

IE3

1

1

Transmission Code

Scan Output

OF0

OF1

OF2

OF3

OF4

OF5

OF6

OF7

D4 D3 D2

0 00

0 01

0 10

0 11

1 00

1 01

1 10

1 11

Custom code

The custom code is made up of input pin DATA

and scan output OF0~OF4. It has 8 bits

(C0~C7); the lower 3 bits of the custom code

(C5, C6 and C7) are fixed as ²0².

Fig. 1 shows an example of custom code selection.

D ATA O F0 O F1 O F2 O F3 O F4

C u s to m c o d e C 0 C 1 C 2 C 3 C 4 C 5 C 6 C 7

11001000

Fig. 1

Extended bit

The extended bit is formed by input pin DATA

and the scan output (OF5~OF7). Fig. 2 shows

an example of extended bit selection.

D ATA

O F5 O F6 O F7

D A T A code

SW =O N

SW =O FF

D5 D6 D7

1

1

0

1

0

0

Transmission Code

DATA Input

OF5

OF6

OF7

D7 D6 D5

¾¾ 1

¾1¾

1 ¾¾

6

SW

Fig. 2

December 16, 1999

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