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AS3930
Datasheet - D e t a i l e d D e s c r i p t i o n
8.8.1
Crystal Oscillator
Table 23. Characteristics of XTAL
Parameter
Crystal accuracy (initial)
Conditions
Overall accuracy
Min
Typ
Max
±120
Units
p.p.m.
Crystal motional resistance
Frequency
Contribution of the oscillator to the frequency
error
32.768
±5
60
K Ω
kHz
p.p.m
Start-up Time
Crystal dependent
1
s
Duty cycle
Current consumption
45
50
1
55
%
μA
8.8.2
RC-Oscillator
Table 24. Characteristics of RCO
Parameter
Frequency
Calibration time
Conditions
If no calibration is performed
If calibration is performed
Periods of reference clock
Min
27
31
Typ
32.768
32.768
Max
42
34.5
65
Units
kHz
kHz
cycles
Current consumption
200
nA
To trim the RC-Oscillator, set the chip select (CS) to high before sending the direct command trim_osc over SDI. Then 65 digital clock cycles of
the reference clock (e.g. 32.768 kHz) have to be sent on the clock bus (SCL), as shown in Figure 20 . After that the signal on the chip select (CS)
has to be pulled down.
The calibration is effective after the 65th reference clock edge and it will be stored in a volatile memory. In case the RC-oscillator is switched off
or a power-on-reset happens (e.g. battery change), then the calibration has to be repeated.
Figure 20. RC-Oscillator Calibration via SDI
CS
SCLK
65 clock cycles
SDI
X
1
1
0
0
0
0
1
0
X
DIRECT COMMAND
Trim_osc
REFERENCE CLOCK
www.ams.com/LF-Receiver/AS3930
Revision 1.5
26 - 32
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