HT6240 查看數據表（PDF） - Holtek Semiconductor

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HT6240

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 instruction.

CT maintains ²L² and no transmission code is gener-

ated 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

D ATA O .0 O .1 O .2 O .3 O .4

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 ex-

tended bit selection.

Transmission Code

Scan Output

OF0

OF1

OF2

OF3

OF4

OF5

OF6

OF7

D4 D3 D2

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

D ATA

O .5 O .6 O .7

D A T A code

SW =O N

SW =O ..

D5 D6 D7

1

1

0

1

0

0

Transmission Code

DATA Input

OF5

OF6

OF7

D7 D6 D5

¾

¾

1

¾

1

¾

1

¾

¾

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.

SW

Fig. 2

Clock oscillating circuit

HT6240 has built-in feedback resistor and CMOS in-

verter, so a ceramic resonator can connect between the

oscillator circuit input pin (OSCI) and the output pin

(OSCO), (see Fig. 3).

When the ceramic resonator is set to 455kHz, the carrier

can be set 38kHz.

Rev. 1.30

5

November 6, 2002

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