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AS3930
Datasheet - D e t a i l e d D e s c r i p t i o n
8.6.2
Single Pattern Detection
Figure 18 shows the wake-up protocol in case the pattern correlation is enabled ( R1<1> =1) for a 125 kHz carrier frequency. The initial carrier
burst has to be longer than 550 μs and can last maximum 16 bits (see bit rate definition in Table 19 ). If the ON/OFF mode is used ( R1<5> =1),
the minimum value of the maximum carrier burst duration is limited to 10 ms. This is summarized in Table 22 . In case the carrier burst is too long
the internal wake-up will be set back to low and the false wake-up counter ( R13<7:0> ) will be incremented by one.
The carrier burst must be followed by a preamble (0101... modulated carrier with a bit duration defined in Table 19 ) and the wake-up pattern
stored in the registers R5<7:0> and R6<7:0> . The preamble must have at least 4 bits and the preamble duration together with the pattern
should not be longer than 40 bits. If the wake-up pattern is correct the signal on the WAKE pin is set to high and the data transmission can get
started. To set the chip back to listening mode the direct command clear_wake, as well as the time out option ( R7<7:5> ) can be used.
Figure 18. Wake-up Protocol Overview with Single Pattern Detection
Carrier Burst
Preamble
Pattern
Data
1-bit Preamble
Carrier Burst>360 us
Carrier Burst<16-bit duration
Preamble > 4-bit duration
Preamble + Pattern < 40-bit duration
DAT
WAKE
Clear_wake
Table 22. Preamble Requirements in Standard Mode, Scanning Mode and ON/OFF Mode
Bit Rate (bit/s)
8192
6552
5460
4680
4096
3640
3276
2978
2730
Maximum Duration of the Carrier Burst in Standard
Mode and Scanning Mode (ms)
1.95
2.44
2.93
3.41
3.90
4.39
4.88
5.37
5.86
Maximum Duration of the Carrier Burst in ON/OFF
Mode (ms)
10
10
10
10
10
10
10
10
10
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