AS3930-BQFT 데이터 시트보기 (PDF) - austriamicrosystems AG
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AS3930-BQFT Datasheet PDF : 32 Pages
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AS3930
Datasheet - Detailed Description
The comparator of the data slicer can work only with positive or with symmetrical threshold R3<6>. In addition the threshold can be 20 or 40 mV
R3<7>. In case the length of the preamble is an issue the data slicer can also work with an absolute threshold R1<7>. In this case the bits
R3<2:0> would not influence the performance. It is even possible to reduce the absolute threshold in case the environment is not particularly
noisy R2<7>.
8.5 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 19) and if no preamble is detected the chip is set back to
listening mode and the false-wake-up 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> (see Table 19) as function of the Real Time Clock (RTC) periods.
Table 19. 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
www.ams.com/LF-Receiver/AS3930
Revision 1.5
20 - 32
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