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CC1111F32RSP 参数 Datasheet PDF下载

CC1111F32RSP图片预览
型号: CC1111F32RSP
PDF下载: 下载PDF文件 查看货源
内容描述: 低功耗低于1 GHz的射频系统级芯片(SoC )与MCU,存储器,收发器和USB控制器 [Low-power sub-1 GHz RF System-on-Chip (SoC) with MCU, memory, transceiver, and USB controller]
分类和应用: 存储射频控制器PC
文件页数/大小: 240 页 / 2823 K
品牌: TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
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CC1110Fx / CC1111Fx  
P1_5,  
P1_6,  
or  
P1_7  
by  
setting  
Unless currently receiving a packet  
Both the above (RSSI below threshold  
and not currently receiving a packet)  
IOCFGx.GDOx_CFG=1001.  
MCSM1.CCA_MODE selects the mode to use  
when determining CCA.  
14.10.8 Link Quality Indicator (LQI)  
When the STXor SFSTXONcommand strobe is  
given while CC1110Fx/CC1111Fx is in the RX state,  
the TX or FSTXON state is only entered if the  
clear channel requirements are fulfilled. The  
chip will otherwise remain in RX (if the channel  
becomes available, the radio will not enter TX  
or FSTXON state before a new strobe  
command is being issued). This feature is  
called TX-if-CCA. Note that when using this  
function the register TEST1 on page 222  
should be set to 0x31.  
The Link Quality Indicator is a metric of the  
current quality of the received signal. If  
PKTCTRL1.APPEND_STATUS is enabled, the  
value is automatically added to the last byte  
appended after the payload. The value can  
also be read from the LQIstatus register. The  
LQI gives an estimate of how easily a received  
signal can be demodulated by accumulating  
the magnitude of the error between ideal  
constellations and the received signal over the  
64 symbols immediately following the sync  
word. LQI is best used as  
a
relative  
Four CCA requirements can be programmed:  
measurement of the link quality (a high value  
indicates a better link than what a low value  
does), since the value is dependent on the  
modulation format.  
Always (CCA disabled, always goes to  
TX)  
If RSSI is below threshold  
14.11 Forward Error Correction with Interleaving  
generated based on k input bits and the m  
most recent input bits, forming a code stream  
able to withstand a certain number of bit errors  
between each coding state (the m-bit window).  
14.11.1 Forward Error Correction (FEC)  
CC1110Fx/CC1111Fx has built in support for  
Forward Error Correction (FEC). To enable this  
option, set MDMCFG1.FEC_EN to 1. FEC is  
only supported in fixed packet length mode  
(PKTCTRL0.LENGTH_CONFIG=0). FEC is  
employed on the data field and CRC word in  
order to reduce the gross bit error rate when  
The convolutional coder is a rate 1/2 code with  
a constraint length of m=4. The coder codes  
one input bit and produces two output bits;  
hence, the effective data rate is halved. I.e. to  
transmit at the same effective data rate when  
using FEC, it is necessary to use twice as high  
over-the-air data rate. This will require a higher  
receiver bandwidth, and thus reduce  
sensitivity. In other words, the improved  
reception by using FEC and the degraded  
sensitivity from a higher receiver bandwidth will  
be counteracting factors.  
operating  
near  
the  
sensitivity  
limit.  
Redundancy is added to the transmitted data  
in such a way that the receiver can restore the  
original data in the presence of some bit  
errors.  
The use of FEC allows correct reception at a  
lower SNR, thus extending communication  
range. Alternatively, for a given SNR, using  
FEC decreases the bit error rate (BER). As the  
packet error rate (PER) is related to BER by:  
14.11.2 Interleaving  
Data received through radio channels will often  
experience burst errors due to interference and  
time-varying signal strengths. In order to  
increase the robustness to errors spanning  
multiple bits, interleaving is used when FEC is  
enabled. After de-interleaving, a continuous  
span of errors in the received stream will  
become single errors spread apart.  
PER = 1(1BER)packet _ length  
,
a lower BER can be used to allow longer  
packets, or a higher percentage of packets of a  
given length, to be transmitted successfully.  
Finally, in realistic ISM radio environments,  
transient and time-varying phenomena will  
produce occasional errors even in otherwise  
good reception conditions. FEC will mask such  
errors and, combined with interleaving of the  
coded data, even correct relatively long  
periods of faulty reception (burst errors).  
CC1110Fx/CC1111Fx employs matrix interleaving,  
which is illustrated in Figure 53. The on-chip  
interleaving and de-interleaving buffers are 4 x  
4 matrices. In the transmitter, the data bits  
from the rate ½ convolutional coder are written  
into the rows of the matrix, whereas the bit  
sequence to be transmitted is read from the  
columns of the matrix. In the receiver, the  
The FEC scheme adopted for CC1110Fx/CC1111Fx  
is convolutional coding, in which n bits are  
SWRS033E  
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