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參數(shù)資料
| 型號： | CC2420 |
| 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標準/ ZigBee功能的RF收發(fā)器 |
| 文件頁數(shù)： | 49/87頁 |
| 文件大小： | 1418K |
| 代理商： | CC2420 |
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SmartRF
CC2420
Clear Channel Assessment
The clear channel assessment signal is
based on the measured RSSI value and a
programmable
threshold.
channel assessment function is used to
implement the CSMA-CA functionality
specified in [1]. CCA is valid when the
receiver has been enabled for at least 8
symbol periods.
The
clear
Carrier
programmed by
RSSI.CCA_THR
. The
threshold value can be programmed in
steps of 1 dB. A CCA hysteresis can also
be
programmed
MDMCTRL0.CCA_HYST
control bits.
sense
threshold
level
is
in
the
All 3 CCA modes specified by [1] are
implemented in
CC2420
. They are set in
MDMCTRL0.CCA_MODE
, as can be seen in
the register description. The different
modes are:
0
Reserved
1
Clear channel when received energy is below
threshold.
2
Clear channel when not receiving valid IEEE
802.15.4 data.
3
Clear channel when energy is below threshold
and not receiving valid IEEE 802.15.4 data
Clear channel assessment is available on
the
CCA
output pin.
CCA
is active high, but
the polarity may be changed by setting the
IOCFG0.CCA_POLARITY
control bit.
Implementing CSMA-CA may easiest be
done by using the
STXONCCA
command
strobe, as described in the Radio control
state machine section on page 42.
Transmission will then only start if the
channel is clear. The
TX_ACTIVE
status
bit (see Table 5) may be used to detect
the result of the CCA.
Frequency and Channel Programming
The operating frequency is set by
programming the 10 bit frequency word
located in
FSCTRL.FREQ[9:0]
. The
operating frequency F
C
in MHz is given by:
F
C
= 2048 +
FSCTRL.FREQ[9:0]
MHz
In receive mode the actual LO frequency
is F
C
– 2 MHz, since a 2 MHz IF is used.
Direct conversion is used for transmission,
so here the LO frequency equals F
C
. The
2 MHz IF is automatically set by
CC2420
,
so the frequency programming is equal for
RX and TX.
IEEE 802.15.4 specifies 16 channels
within the 2.4 GHz band, numbered 11
through 26. The RF frequency of channel
k is given by [1] :
F
C
= 2405 + 5 (k-11) MHz, k=11, 12, ..., 26
For
FSCTRL.FREQ
register should therefore
be set to:
operation
in
channel
k,
the
FSCTRL.FREQ
= 357 + 5 (k-11)
Chipcon AS
SmartRF
CC2420 Preliminary Datasheet (rev 1.2), 2004-06-09
Page 49 of 87
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CC2420/T&R | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver |
| CC2420/TR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver |
| CC2420DBK | 功能描述:Zigbee/802.15.4開發(fā)工具 CC2420 DEMO KIT 2 DEMO BOARDS RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓: |
| CC2420DK | 功能描述:Zigbee/802.15.4開發(fā)工具 CC2420 DEVELOPMENT KIT RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓: |
| CC2420EMK | 功能描述:Zigbee/802.15.4開發(fā)工具 CC2420 EVALUATION KT (2)PCBs & (2)ANTENNA RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓: |
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