參數(shù)資料
型號(hào)： PCA8521BT
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 搖控器
英文描述： Infrared remote control transmitter RC5
中文描述： INFRARED, TRANSMITTER IC, PDSO20
封裝： 7.50 MM, PLASTIC, MS-013AC, SOT-163-1, SOP-20
文件頁(yè)數(shù)： 6/20頁(yè)
文件大小： 100K
代理商： PCA8521BT
1999 Jun 15
6
Philips Semiconductors
Product specification
Infrared remote control transmitter RC5
PCA8521
FUNCTIONAL DESCRIPTION
Key numbering for the matrix is given in Tables 1 and 2.
Table 1
Key numbering for 16-pin package
Table 2
Key numbering for 20-pin package
DRIVER
LINES
SENSE LINES
SN0
SN1
SN2
SN3
SN4
SN5
DR0
DR1
DR2
DR3
DR4
0
8
1
9
2
3
11
19
27
35
4
5
10
18
26
34
12
20
28
36
13
21
29
37
16
24
32
17
25
33
DRIVER
LINES
SENSE LINES
SN0
SN1
SN2
SN3
SN4
SN5
SN6
SN7
DR0
DR1
DR2
DR3
DR4
DR5
DR6
0
8
16
24
32
40
48
1
9
2
3
11
19
27
35
43
51
4
5
6
7
10
18
26
34
42
50
12
20
28
36
44
52
13
21
29
37
45
53
14
22
30
38
46
54
15
23
31
39
47
55
17
25
33
41
49
When the keys have been scanned the key-number of the
activated key serves as the address of the ROM to obtain
the required code-word. When a 16-pin IC is used the
following sense lines and driver lines will not be connected;
SN6, SN7, DR5 and DR6. 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 select
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 a 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 a jumper wire. Instead of a
jumper wire a side-switch may also be used to change the
generated code temporarily (select different bank) to
obtain multi-function keys. With this option the jumper
wires or switch must be connected between sense line
SN0 and one of the drive lines DR0 to DR6 or ground. This
means that SN0 cannot be used to connect keys and the
maximum number of keys will be 25 keys for a 16-pin
package and 49 keys for a 20-pin package.
It is not possible to use a combination of jumper wires and
selection keys for bank selection in one unit.
The output of the ROM is loaded into a shift register that
provides the input bits for the pulse generator. This pulse
generator drives the output pin.
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