AS3932 Просмотр технического описания (PDF) - austriamicrosystems AG
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AS3932 Datasheet PDF : 33 Pages
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AS3932
Data Sheet - Detailed Description
8.6 Correlator
After frequency detection the data correlation is only performed if the correlator is enabled (R1<1>=1).
The data correlation consists of checking the presence of a preamble (ON/OFF modulated carrier) followed by a certain pattern.
After the frequency detection the correlator waits 16 bits (see bit rate definition in Table 18) and if no preamble is detected the chip is set back to
listening mode and the false-wakeup register (R13<7:0>) is incremented by one.
To get started with the pattern correlation the correlator needs to detect at least 4 bits of the preamble (ON/OFF modulated carrier).
The bit duration is defined in the register R7<4:0> according to the Table 18 as function of the Real Time Clock (RTC) periods.
Table 18. Bit Rate Setup
R7<4> R7<3> R7<2> R7<1> R7<0>
Bit duration in RTC
clock periods
Bit rate (bits/s)
Symbol rate (Manchester
symbols/s)
0
0
0
1
1
4
8192
4096
0
0
1
0
0
5
6552
3276
0
0
1
0
1
6
5460
2730
0
0
1
1
0
7
4680
2340
0
0
1
1
1
8
4096
2048
0
1
0
0
0
9
3640
1820
0
1
0
0
1
10
3276
1638
0
1
0
1
0
11
2978
1489
0
1
0
1
1
12
2730
1365
0
1
1
0
0
13
2520
1260
0
1
1
0
1
14
2340
1170
0
1
1
1
0
15
2184
1092
0
1
1
1
1
16
2048
1024
1
0
0
0
0
17
1926
963
1
0
0
0
1
18
1820
910
1
0
0
1
0
19
1724
862
1
0
0
1
1
20
1638
819
1
0
1
0
0
21
1560
780
1
0
1
0
1
22
1488
744
1
0
1
1
0
23
1424
712
1
0
1
1
1
24
1364
682
1
1
0
0
0
25
1310
655
1
1
0
0
1
26
1260
630
1
1
0
1
0
27
1212
606
1
1
0
1
1
28
1170
585
1
1
1
0
0
29
1128
564
1
1
1
0
1
30
1092
546
1
1
1
1
0
31
1056
528
1
1
1
1
1
32
1024
512
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Revision 1.2
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