參數(shù)資料
型號(hào)： CC2420SK
廠商： Electronic Theatre Controls, Inc.
英文描述： 2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver
中文描述： 2.4 GHz IEEE 802.15.4標(biāo)準(zhǔn)/ ZigBee功能的RF收發(fā)器
文件頁(yè)數(shù)： 22/87頁(yè)
文件大小： 1418K
代理商： CC2420SK
SmartRF
CC2420
IEEE 802.15.4 Modulation Format
This section is meant as an introduction to
the 2.4 GHz direct sequence spread
spectrum (DSSS) RF modulation format
defined in IEEE 802.15.4. For a complete
description, please refer to [1].
The modulation and spreading functions
are illustrated at block level in Figure 5 [1].
Each byte is divided into two symbols, 4
bits each. The least significant symbol is
transmitted first. For multi-byte fields, the
least significant byte is transmitted first,
except for security related fields where the
most significant byte it transmitted first.
Each symbol is mapped to one out of 16
pseudo-random sequences, 32 chips
each. The symbol to chip mapping is
shown in Table 3. The chip sequence is
then transmitted at 2 MChips/s, with the
least significant chip (C
0
) transmitted first
for each symbol.
Bit-to-
Symbol
Symbol-
to-Chip
O-QPSK
Modulator
Transmitted
bit-stream
(LSB first)
Modulated
Signal
Figure 5. Modulation and spreading functions [1]
Symbol
Chip sequence (C
0
, C
1
, C
2
, … , C
31
)
0
1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0
1
1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0
2
0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0
3
0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1
4
0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1
5
0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0
6
1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1
7
1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1
8
1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1
9
1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1
10
0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1
11
0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0
12
0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0
13
0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1
14
1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0
15
1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0
Table 3. IEEE 802.15.4 symbol-to-chip mapping [1]
The modulation format is Offset –
Quadrature Phase Shift Keying (O-QPSK)
with half-sine chip shaping. This is
equivalent to MSK modulation. Each chip
is shaped as a half-sine, transmitted
alternately in the I and Q channels with
one half chip period offset. This is
illustrated for the zero-symbol in Figure 6.
Chipcon AS
SmartRF
CC2420 Preliminary Datasheet (rev 1.2), 2004-06-09
Page 22 of 87
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CC2420-STB1 功能描述:射頻收發(fā)器 USE 839-CC2420R 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
CC2420-STR1 功能描述:射頻收發(fā)器 USE 839-CC2420T/R-R 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
CC2420ZDK 功能描述:Zigbee/802.15.4開發(fā)工具 FULL CC2420 DEVELOPMENT KIT RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評(píng)估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓:
CC2420ZDK-PRO 功能描述:Zigbee/802.15.4開發(fā)工具 FULL PRO CC2420 DEVELOPMENT KIT RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評(píng)估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓:
CC2420Z-RTB1 功能描述:射頻收發(fā)器 Sgl-Chip 2.4 GHz Zig Bee Ready RF Trnscvr 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
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