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.
VCC
LF1P
LF2P
LF3P
LFN
VSS
GND
XIN
XOUT
WAKE
DAT
CL_ DAT
CS
SCL
SDI
SDO
CBAT
X,
Y
A
N
D
Z
R
E
C
EI
VI
N
G
A
N
T
E
N
N
A
S
TX
TRANSMITTER
TR
AN
SM
IT
T
ING
AN
T
E
N
N
A
AS3932
VCC
Copy
right
©
20
09
au
stri
am
icro
syste
m
s
Figure 2-4: Application diagram of AS3932 in case the RC-oscillator is used.
Version 1.0, Date: 20/02/2009
Page 4 of 7
ams
AG
Technical
content
still
valid
