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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
Figure 20. Concept of the False Wake-up Register together with the system
Frequency Detector
Wakeup
Level 1
Pattern Correlator
Wakeup
Level 2
WAKE
Unsuccessful
pattern
correlation
Register Setup
False wakeup
register
READ FALSE WAKEUP REGISTER
Microcontroller
8.8 Real Time Clock (RTC)
The RTC can be based on a crystal oscillator ( R1<0> =1), the internal RC-oscillator ( R1<0> =0), or an external clock source ( R1<0> =1). The
crystal oscillator has higher precision of the frequency with higher current consumption and needs three external components (crystal plus two
capacitors). The RC-oscillator is completely integrated and can be calibrated if a reference signal is available for a very short time to improve the
frequency accuracy. The calibration gets started with the trim_osc direct command. Since no non-volatile memory is available the calibration
must be done every time after the RCO is turned off. The RCO is turned off when the chip is in power down mode, a POR happened, or the
crystal oscillator is enabled. Since the RTC defines the time base of the frequency detection, the selected frequency (frequency of the crystal
oscillator or the reference frequency used for calibration of the RC oscillator) should be about one forth of the carrier frequency:
F RTC ~ F CAR * 0.25
Where: F CAR is the carrier frequency and F RTC is the RTC frequency
The third option for the RTC is the use of an external clock source, which must be applied directly to the XIN pin (XOUT floating).
(EQ 1)
www.ams.com/LF-Receiver/AS3932
Revision 1.7
27 - 34
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