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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 Wake-up Protocol - Carrier Frequency 125 kHz
8.6.1
Without Pattern Detection
Figure 17. 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 AS3930 wakes up upon detection of the carrier frequency only, as shown in Figure 17 . In
order to ensure that AS3930 wakes up, the carrier burst has to last longer than 550 μs. There are two possibilities to set AS3930 back to
listening mode: 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, then the AS3930 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.
www.ams.com/LF-Receiver/AS3930
Revision 1.5
22 - 32
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