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參數(shù)資料
| 型號： | MC13214R2 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, BGA71 |
| 封裝： | 9 X 9 MM, 1 MM HEIGHT, ROHS COMPLIANT, LGA-71 |
| 文件頁數(shù)： | 60/70頁 |
| 文件大?。?/td> | 802K |
| 代理商： | MC13214R2 |
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MC13211/212/213/214 Technical Data, Rev. 0.0,
Freescale Semiconductor
63
7
Application Considerations
7.1
Crystal Oscillator Reference Frequency
The IEEE 802.15.4 Standard requires that several frequency tolerances be kept within ± 40 ppm accuracy.
This means that a total offset up to 80 ppm between transmitter and receiver will still result in acceptable
performance. The MC1321x transceiver provides onboard crystal trim capacitors to assist in meeting this
performance. The primary determining factor in meeting the 802.15.4 standard, is the tolerance of the
crystal oscillator reference frequency. A number of factors can contribute to this tolerance and a crystal
specification will quantify each of them:
1. The initial (or make) tolerance of the crystal resonant frequency itself.
2. The variation of the crystal resonant frequency with temperature.
3. The variation of the crystal resonant frequency with time, also commonly known as aging.
4. The variation of the crystal resonant frequency with load capacitance, also commonly known as
pulling. This is affected by:
a) The external load capacitor values - initial tolerance and variation with temperature.
b) The internal trim capacitor values - initial tolerance and variation with temperature.
c) Stray capacitance on the crystal pin nodes - including stray on-chip capacitance, stray package
capacitance and stray board capacitance; and its initial tolerance and variation with
temperature.
5. Whether or not a frequency trim step will be performed in production
7.1.1
Crystal Oscillator Design Considerations
Freescale requires that a 16 MHz crystal with a <9 pF load capacitance is used. The MC1321x does not
contain a reference divider, so 16 MHz is the only frequency that can be used. A crystal requiring higher
load capacitance is prohibited because a higher load on the amplifier circuit may compromise its
performance. The crystal manufacturer defines the load capacitance as that total external capacitance seen
across the two terminals of the crystal. The oscillator amplifier configuration used in the MC1321x
requires two balanced load capacitors from each terminal of the crystal to ground. As such, the capacitors
are seen to be in series by the crystal, so each must be <18 pF for proper loading.
In the Figure 34 crystal reference schematic, the external load capacitors are shown as 6.8 pF each, used
in conjunction with a crystal that requires an 8 pF load capacitance. The default internal trim capacitor
value (2.4 pF) and stray capacitance total value (6.8 pF) sum up to 9.2 pF giving a total of 16 pF. The value
for the stray capacitance was determined empirically assuming the default internal trim capacitor value and
for a specific board layout. A different board layout may require a different external load capacitor value.
3 Typical endurance for FLASH was evaluated for this product family on the 9S12Dx64. For additional information on how
Freescale Semiconductor defines typical endurance, please refer to Engineering Bulletin EB619/D, Typical Endurance for
Nonvolatile Memory.
4 Typical data retention values are based on intrinsic capability of the technology measured at high temperature and de-rated
to 25
°C using the Arrhenius equation. For additional information on how Freescale Semiconductor defines typical data
retention, please refer to Engineering Bulletin EB618/D, Typical Data Retention for Non-volatile Memory.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MC1321X | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述: |
| MC1321X_09 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:ZigBee?- Compliant Platform - 2.4 GHz Low Power Transceiver for the IEEE? 802.15.4 Standard plus Microcontroller |
| MC13224V | 功能描述:射頻收發(fā)器 PIP 802.15.4 2.4G IND RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
| MC13224V | 制造商:Freescale Semiconductor 功能描述:; Controller Family/Series:(ARM7); Memor |
| MC13224V_09 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Advanced ZigBee?- Compliant Platform-in-Package (PiP) for the 2.4 GHz IEEE? 802.15.4 Standard |
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