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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 : MAC Security Operations (Encryption and Authentication)  
14.21 MAC Security Operations (Encryption and Authentication)  
CC2430 features hardware IEEE 802.15.4 MAC  
security operations. Refer to section 13.12 on  
page 136 for a description of the AES  
encryption unit.  
14.22 Linear IF and AGC Settings  
dynamic range by using an analog/digital  
feedback loop.  
C2430 is based on a linear IF chain where the  
signal amplification is done in an analog VGA  
(variable gain amplifier). The gain of the VGA  
is digitally controlled.  
The AGC characteristics are set through the  
AGCCTRLL:AGCCTRLH, registers. The reset  
values should be used for all AGC control  
registers.  
The AGC (Automatic Gain Control) loop  
ensures that the ADC operates inside its  
14.23 RSSI / Energy Detection  
where the RSSI_OFFSET is found empirically  
during system development from the front end  
gain. RSSI_OFFSET is approximately –45.  
E.g. if reading a value of –20 from the RSSI  
register, the RF input power is approximately –  
65 dBm.  
CC2430 has a built-in RSSI (Received Signal  
Strength Indicator) giving a digital value that  
can be read from the 8 bit, signed 2’s  
complement RSSIL.RSSI_VALregister bits.  
The RSSI value is always averaged over 8  
symbol periods (128 µs), in accordance with  
[1].  
A typical plot of the RSSI_VAL reading as  
function of input power is shown in Figure 47.  
It can be seen from the figure that the RSSI  
reading from CC2430 is very linear and has a  
dynamic range of about 100 dB.  
The RSSI register value RSSI.RSSI_VALcan  
be referred to the power P at the RF pins by  
using the following equations:  
P = RSSI_VAL+ RSSI_OFFSET[dBm]  
60  
40  
20  
0
-100  
-80  
-60  
-40  
-20  
0
-20  
-40  
-60  
RF Level [dBm]  
Figure 47: Typical RSSI value vs. input power  
14.24 Link Quality Indication  
The link quality indication (LQI) measurement  
is a characterization of the strength and/or  
quality of a received packet, as defined by [1].  
Software is responsible for generating the  
appropriate scaling of the LQI value for the  
given application.  
The RSSI value described in the previous  
section may be used by the MAC software to  
produce the LQI value. The LQI value is  
required by [1] to be limited to the range 0  
through 255, with at least eight unique values.  
Using the RSSI value directly to calculate the  
LQI value has the disadvantage that e.g. a  
narrowband interferer inside the channel  
bandwidth will increase the LQI value although  
it actually reduces the true link quality. CC2430  
CC2430 Data Sheet (rev. 2.1) SWRS036F  
Page 168 of 211