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HT6240-002 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc

Part # HT6240-002
Description  Infrared Remote Encoder
Download  14 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT6240-002 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc

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HT6240-002
6
December 16, 1999
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
00
IE1
01
IE2
10
IE3
11
Transmission Code
Scan Output
D4
D3
D2
OF0
00
0
OF1
00
1
OF2
01
0
OF3
01
1
OF4
10
0
OF5
10
1
OF6
11
0
OF7
11
1
Transmission Code
DATA Input
D7
D6
D5
OF5
¾¾
1
OF6
¾
1
¾
OF7
1
¾¾
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.
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.
DA T A
OF 5 O F 6 OF 7
D A T A c ode
SW = O N
SW = O F F
D5
1
1
D6
1
0
D7
0
0
SW
Fig. 2
D A TA
O F 0 O F1 O F 2 O F3 O F 4
C u st o m c ode C0
1
C1
1
C2
0
C3
0
C4
1
C5
0
C6
0
C7
0
Fig. 1


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