SC8521 データシートの表示（PDF） - Silan Microelectronics
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SC8521 Datasheet PDF : 16 Pages
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Silan
Semiconductors
SC8521
(Continued)
Pin No.
17
18
19
20
Symbol
DR6
VSS
Lout
VDD
Description
Drive line 6 for key matrix (active LOW)
Ground
Output signal
Power supply
FUNCTION DESCRIPTION
1. Key numbering for matrix is given in tables 1
Table1 key numbering for 20-pin package
Driver lines
SN0
SN7
SN1
Sense lines
SN2
SN3
SN6
SN4
DR5
0:BANK0
1
2
3
4
5
6
DR4
8:BANK1
9
10
11
12
13
14
DR3
16:BANK2
17
18
19
20
21
22
DR2
24:BANK3
25
26
27
28
29
30
DR1
32:BANK4
33
34
35
36
37
38
DR0
40:BANK5
41
42
43
44
45
46
DR6
48:BANK6
49
50
51
52
53
54
SN0 connected GND, send BANK7 code. BANK0----7 see the following code table.
SN5
7
15
23
31
39
47
55
When the keys have been scanned the key-number of the activated key serves as the address of the ROM to
obtain the required codeword. Consequently, key numbers 6, 7, 14, 15, 22, 23, 30, 31, 38, 39 and 40 to 55 will not
be addressed.
The ROM contains 8 banks of 64 code words. Thus for each key a maximum of 8 different code words may be
generated. With multi-system use, 8 different systems (e.g. TV, VCR, tuner, CD etc.) may be selected. Apart from
the system bits the command bits may also be different in different banks (true multi-function keys). Selection can
be performed using the keys. For each key three bank selected bits are present that determine which bank will be
selected for the next key.
For each key an ‘inhibit’ bit is also present. When this bit is at logic 1 at an address in a given bank, and when
the corresponding key is pressed (when this bank has been selected) no transmission will take place.
A single system option is available however, whereby instead of keys jumper wire and/or a switch may be used
for bank selection. Using this option it is possible to program different transmitter models in one IC and select the
required bank by means of jumper wire. Instead of a jumper wire a side-switch may also be used to change the
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
REV: 1.3
4
2002.03.01
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