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AS3932
Datasheet - D e t a i l e d D e s c r i p t i o n
8.6.1
Without Pattern Detection
Figure 18. Wake-up Protocol Overview without Pattern Detection (only carrier frequency detection)
Carrier Burst
Data
Carrier Burst > 550 us
DAT
WAKE
Clear_wake
In case the data correlation is disabled ( R1<1> =0) the AS3932 wakes up upon detection of the carrier frequency only as shown in Figure 18 . In
order to ensure that AS3932 wakes up the carrier burst has to last longer than 550 μs. To set AS3932 back to listening mode there are two
possibilities: either the microcontroller sends the direct command clear_wake via SDI or the time out option is used ( R7<7:5> ). In case the latter
is chosen, AS3932 is automatically set to listening mode after the time defined in T_OUT ( R7<7:5> ), counting starts at the low-to-high WAKE
edge on the WAKE pin.
8.6.2
Single Pattern Detection
The Figure 19 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 goes high one bit after the end of the pattern 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.
www.ams.com/LF-Receiver/AS3932
Revision 1.7
24 - 34
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