ams AG AS3932 Nota applicativa - Pagina 7
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Stampa la paginaApplication Note AS3932 - Migration from ATA5283 (1-channel) to AS3932
signal is detected). The minimum duration of the carrier burst is 360us for AS3932. To wake the AS3932 up, no
"start gap" is needed, as shown in the figure 3-2.
Figure 3-2: AS3932 wakeup protocol description
The procedure to set up the AS3932 working in this way is described below.
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Send the preset_default direct command
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Write in the register R0<7:0> 02 (HEX) This ensures that Channel 2 and Channel 3 are disabled in order to
reduce the current consumption.
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Write R1<7:0> 21 (HEX) in case the crystal oscillator is used or write R1<7:0> 20 (HEX) if the RC oscillator is
used. In this way the wakeup will occur only based on frequency detection.
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Set the envelop detector time constant (R3<2:0>) according to the used bit rate (see p. 20 of AS3932 data
sheet).
Version 1.0, Date: 20/02/2009
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