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CC2430F32RTC 参数 Datasheet PDF下载

CC2430F32RTC图片预览
型号: CC2430F32RTC
PDF下载: 下载PDF文件 查看货源
内容描述: 真正的系统级芯片解决方案的2.4 GHz IEEE 802.15.4 / ZigBee的 [A True System-on-Chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee]
分类和应用: 电信集成电路
文件页数/大小: 212 页 / 1862 K
品牌: TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
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CC2430  
Radio : System Considerations and Guidelines  
14.31 System Considerations and Guidelines  
14.31.1 SRD regulations  
International regulations and national laws  
regulate the use of radio receivers and  
transmitters. SRDs (Short Range Devices) for  
license free operation are allowed to operate  
in the 2.4 GHz band worldwide. The most  
important regulations are ETSI EN 300 328  
and EN 300 440 (Europe), FCC CFR-47 part  
15.247 and 15.249 (USA), and ARIB STD-T66  
(Japan).  
14.31.2 Frequency hopping and multi-channel systems  
The 2.4 GHz band is shared by many systems  
both in industrial, office and home  
environments. CC2430 uses direct sequence  
spread spectrum (DSSS) as defined by [1] to  
spread the output power, thereby making the  
communication link more robust even in a  
noisy environment.  
802.15.4 system. This is achieved by  
reprogramming the operating frequency (see  
the Frequency and Channel Programming  
section on page 169) before enabling RX or  
TX. A frequency synchronization scheme must  
then be implemented within the proprietary  
MAC layer to make the transmitter and  
receiver operate on the same RF channel.  
With CC2430 it is also possible to combine  
both DSSS and FHSS (frequency hopping  
spread spectrum) in a proprietary non-IEEE  
14.31.3 Data burst transmissions  
The data buffering in CC2430 lets the user  
have a lower data rate link between the CPU  
and the radio module than the RF bit rate of  
250 kbps. This allows the CPU to buffer data  
at its own speed, reducing the workload and  
timing requirements. DMA transfers may be  
used to efficiently move data to and from the  
The relatively high data rate of CC2430 also  
reduces the average power consumption  
compared to the 868 / 915 MHz bands defined  
by [1], where only 20 / 40 kbps are available.  
CC2430 may be powered up a smaller portion  
of the time, so that the average power  
consumption is reduced for a given amount of  
data to be transferred.  
radio FIFOs.  
14.31.4 Crystal accuracy and drift  
A crystal accuracy of ±40 ppm is required for  
compliance with IEEE 802.15.4 [1]. This  
accuracy must also take ageing and  
temperature drift into consideration.  
total frequency offset between the transmitter  
and receiver. This could e.g. relax the  
accuracy requirement to 60 ppm for each of  
the devices.  
A crystal with low temperature drift and low  
aging could be used without further  
compensation. A trimmer capacitor in the  
crystal oscillator circuit (in parallel with C191 in  
Figure 6) could be used to set the initial  
frequency accurately.  
Optionally in a star network topology, the full-  
function device (FFD) could be equipped with  
a more accurate crystal thereby relaxing the  
requirement on the reduced-function device  
(RFD). This can make sense in systems where  
the reduced-function devices ship in higher  
volumes than the full-function devices.  
For non-IEEE 802.15.4 systems, the robust  
demodulator in CC2430 allows up to 140 ppm  
14.31.5 Communication robustness  
highly important parameters for reliable  
operation in the 2.4 GHz band, since an  
increasing number of devices/systems are  
using this license free frequency band.  
CC2430 provides very good adjacent, alternate  
and co channel rejection, image frequency  
suppression and blocking properties. The  
CC2430 performance is significantly better than  
the requirements imposed by [1]. These are  
14.31.6 Communication security  
The hardware encryption and authentication  
communication, which is required for many  
applications. Security operations require a lot  
operations  
in  
CC2430  
enable  
secure  
CC2430 Data Sheet (rev. 2.1) SWRS036F  
Page 173 of 211