参数资料
型号: AS3932-BTST
厂商: ams
文件页数: 28/34页
文件大小: 0K
描述: IC RF PROGRAM 16-TSSOP
标准包装: 1
RF 型: 读/写
频率: 110kHz ~ 150kHz
特点: 配有 RSSI
封装/外壳: 16-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 16-TSSOP
包装: 标准包装
产品目录页面: 805 (CN2011-ZH PDF)
其它名称: AS3932-BTSTDKR
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
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Crystal accuracy
(initial)
Crystal motional resistance
Frequency
Contribution of the oscillator to the
frequency error
Start-up Time
Overall accuracy
Crystal dependent
32.768
±5
1
±120
60
p.p.m.
K Ω
kHz
p.p.m
s
Duty cycle
Current consumption
45
50
1
55
%
μA
8.8.2
RC-Oscillator
Table 24. Characteristics of RCO
Symbol
Parameter
Frequency
Conditions
If no calibration is performed
If calibration is performed
Min
27
31
Typ
32.768
32.768
Max
42
34.5
Units
kHz
kHz
Calibration time
Current consumption
Periods of reference clock
200
65
cycles
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 (SCLK), as shown in Figure 21 . 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) the calibration has to be repeated.
Figure 21. RC-Oscillator Calibration via SDI
www.ams.com/LF-Receiver/AS3932
Revision 1.7
28 - 34
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