AS3932-BQFT austriamicrosystems, AS3932-BQFT Datasheet - Page 29

• Manufacturer Part Number: AS3932-BQFT
• Description: IC RF PROGRAM 16-QFN
• Manufacturer: austriamicrosystems

Specifications of AS3932-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: AS3932-BQFTTR

AS3932
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
8.8.2 RC-Oscillator
Table 24. 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 23. RC-Oscillator Calibration via SDI
www.austriamicrosystems.com/LF-Receiver/AS3932
Symbol
Symbol
Contribution of the oscillator to the
Crystal motional resistance
Current consumption
Current consumption
Calibration time
Crystal accuracy
Parameter
Frequency
frequency error
Start-up Time
Parameter
Frequency
Duty cycle
(initial)
If no calibration is performed
Periods of reference clock
If calibration is performed
Crystal dependent
Overall accuracy
Revision 1.4
Conditions
Conditions
Figure
23. After that the signal on the chip select (CS)
Min
45
Min
27
31
32.768
Typ
±5
50
32.768
32.768
1
1
Typ
200
±120
Max
60
55
Max
34.5
42
65
p.p.m.
Units
p.p.m
KΩ
kHz
µA
%
cycles
s
Units
kHz
kHz
nA
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