HT6240-002(1999) 查看數據表（PDF） - Holtek Semiconductor

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HT6240-002
(Rev.:1999)

Infrared Remote Encoder

Holtek Semiconductor 

HT6240-002

CT will send at least three words if we press a

legal key. CT may send three or four words, or

several words depending 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

connecting a capacitor to PRB pin while power

is applied. The time (tC) must be longer than

0.1ms when the voltage in PRB pin (VC) be-

comes 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 in-

put to IE0~IE3.

0 .5 3 m s

1 .0 6 m s

0 .5 3 m s

H e a d p u ls e

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

B it " 0 "

2 .1 1 m s

Fig. 10

B it " 1 "

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

8 .4 4 m s

4 .2 2 m s

1 -w o rd

Fig. 11

4 .2 2 m s

1 w o rd

1 w o rd

6 7 .5 m s

Fig. 12

VSS

1

PRB 3

20 V D D

H T 6 2 4 0 -0 0 2

Fig. 13 Example of power-on reset function

V o lta g e

VDD

2 .2 V

V D D p in

P R B p in

0 .3 V D D

0

T im e

T C > 0 .1 m s

Fig. 14 Relationship between the PRB pin and

the voltage

9

December 16, 1999

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