ams AG AS3932 Application Note - Page 5

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Application Note AS3932 - Migration from ATA5283 (1-channel) to AS3932
Figure 2-3: Alternative application diagram of AS3932.
2.2

Oscillator frequency

The ATA5283 has no Real Time Clock (RTC), while the AS3932 has a RTC that either uses a crystal oscillator or
the fully integrated RC oscillator. In case a crystal oscillator is used, a 32768 Hz quartz and two capacitors
(specified by the crystal manufacturer) are needed for AS3932.
AS3932 also offers the possibility to define the oscillator frequency using the internal RC-oscillator. This oscillator
can be calibrated with the microcontroller (see p. 27 of AS3932 data sheet) in order to increase its precision. In
this case the XIN and XOUT have to be connected to the positive supply voltage, as shown in figure 2-4.
TRANSMITTER
TX
Figure 2-4: Application diagram of AS3932 in case the RC-oscillator is used.
Version 1.0, Date: 20/02/2009
VCC
CBAT
VCC
CS
XIN
CL_ DAT
XOUT
DAT
LF1P
WAKE
AS3932
LF2P
SCL
LF3P
SDO
LFN
SDI
VSS
GND
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