AS3932-BTST austriamicrosystems, AS3932-BTST Datasheet - Page 22

• Manufacturer Part Number: AS3932-BTST
• Description: IC RF PROGRAM 16-TSSOP
• Manufacturer: austriamicrosystems

Specifications of AS3932-BTST

• Rf Type: Read / Write
• Frequency: 110kHz ~ 150kHz
• Features: RSSI Equipped
• Package / Case: 16-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS3932-BTSTTR

AS3932
Datasheet - D e t a i l e d D e s c r i p t i o n
Note: These times are minimum required, but it is recommended to prolong the preamble.
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
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 19. Bit Rate Setup
www.austriamicrosystems.com/LF-Receiver/AS3932
R7<4>
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
R7<3>
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
R7<2>
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
R7<1>
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
R7<0>
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Bit duration in RTC
clock periods
Table 19
Revision 1.4
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
4
5
6
7
8
9
as function of the Real Time Clock (RTC) periods.
Table
19) and if no preamble is detected the chip is set back to
Bit rate (bits/s)
8192
6552
5460
4680
4096
3640
3276
2978
2730
2520
2340
2184
2048
1926
1820
1724
1638
1560
1488
1424
1364
1310
1260
1212
1170
1128
Symbol rate (Manchester
symbols/s)
4096
3276
2730
2340
2048
1820
1638
1489
1365
1260
1170
1092
1024
963
910
862
819
780
744
712
682
655
630
606
585
564
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