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AS3933 Scheda tecnica(PDF) 44 Page - ams AG |
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AS3933 Scheda tecnica(HTML) 44 Page - ams AG |
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44 / 64 page  ams Datasheet Page 43 [v1-08] 2015-Sep-02 Document Feedback AS3933 − Detailed Description Wake-Up Protocol The AS3933 can support different protocols: • Frequency detection only (no pattern correlation) • Single pattern detection • 16-bit pattern • 32-bit pattern • Double pattern detection • 16-bits pattern • 32-bits pattern The wake-up state can be terminated either by the host system (MCU) with the direct command ‘clear_wake’ sent over SPI (see direct command details in Figure 29) or with a time-out option. In case the latter is used the host system (MCU) does not need to take any action to terminate the wake-up state and the chip is set back to listening mode automatically after a predefined time. It is possible to set the duration of the time-out with the register R7<7:5>, as shown in the Figure 49. Figure 49: Timeout Setup R7<7> R7<6> R7<5> Time Out 0 0 0 disabled 0 0 1 50 msec 0 1 0 100 msec 0 1 1 150 msec 1 0 0 200 msec 1 0 1 250 msec 1 1 0 300 msec 1 1 1 350 msec |
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