AS3930-BQFT austriamicrosystems, AS3930-BQFT Datasheet - Page 27

• Manufacturer Part Number: AS3930-BQFT
• Description: IC RF PROGRAM RECEIVER 16-QFN
• Manufacturer: austriamicrosystems

Specifications of AS3930-BQFT

• Rf Type: Read / Write
• Frequency: 110kHz ~ 150kHz
• Features: RSSI Equipped
• Package / Case: 16-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS3930-BQFTTR

AS3930
Data Sheet - D e t a i l e d D e s c r i p t i o n
8.9.1 Crystal Oscillator
Table 22. Characteristics of XTAL
8.9.2 RC-Oscillator
Table 23. Characteristics of RCO
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
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) the calibration has to be repeated.
Figure 21. RC-Oscillator calibration via SDI
8.9.3 External Clock Source
To clock the AS3930 with an external signal the crystal oscillator has to be enabled (R1<1>=1). As shown in the
applied on the pin XIN while the pin XOUT must stay floating. The RC time constant has to be 100μs with a tolerance of ±10% (e.g. R=680 kΩ
and C=22pF). In the
Table 24. Characteristics of External Clock
www.austriamicrosystems.com/AS3930
Symbol
Symbol
Symbol
Vh
VI
Contribution of the oscillator to the
Table 24
Crystal motional resistance
Current consumption
Current consumption
Calibration time
Crystal accuracy
Parameter
Parameter
Frequency
frequency error
High level
Low level
Start-up Time
the clock characteristics are summarized.
Parameter
Frequency
Duty cycle
(initial)
If no calibration is performed
Periods of reference clock
If calibration is performed
Crystal dependent
Overall accuracy
Revision 1.0
Conditions
Conditions
Conditions
Figure
21. After that the signal on the chip select (CS)
Min
0.9*V
45
Min
Min
27
31
0
DD
32.768
Typ
±5
50
32.768
32.768
Figure 3
1
1
Typ
200
Typ
the clock must be
±120
Max
0.1* V
60
55
V
Max
34.5
Max
42
65
DD
DD
p.p.m.
Units
p.p.m
kHz
KΩ
µA
%
cycles
s
Units
Units
kHz
kHz
nA
V
V
27 - 33