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參數(shù)資料
| 型號(hào)： | 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(biāo)準(zhǔn)/ ZigBee功能的RF收發(fā)器 |
| 文件頁數(shù)： | 48/87頁 |
| 文件大?。?/td> | 1418K |
| 代理商： | CC2420 |
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SmartRF
CC2420
-60
-40
-20
0
20
40
60
-100
-80
-60
-40
-20
0
RF Level [dBm]
R
Figure 26. Typical RSSI value vs. input power
Link Quality Indication
The
measurement is a characterisation of the
strength and/or quality of a received
packet, as defined by [1].
link
quality
indication
(LQI)
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 8 unique values.
Software is responsible for generating the
appropriate scaling of the LQI value for the
given application.
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.
CC2420
therefore also provides
an average correlation value for each
incoming packet, based on the 8 first
symbols following the SFD. This unsigned
7-bit value can be looked upon as a
measurement of the “chip error rate,”
although
CC2420
does not do chip
decision.
As described in the Frame check
sequence section on page 36, the average
correlation value for the 8 first symbols is
appended to each received frame together
with the RSSI and CRC OK/not OK when
MDMCTRL0.AUTOCRC
is set. A correlation
value of ~110 indicates a maximum quality
frame while a value of ~50 is typically the
lowest quality frames detectable by
CC2420
.
Software must convert the correlation
value to the range 0-255 defined by [1],
e.g. by calculating:
LQI = (CORR –
a
) ·
b
limited to the range 0-255, where
a
and
b
are found empirically based on PER
measurements as a function of the
correlation value.
A combination of RSSI and correlation
values may also be used to generate the
LQI value.
Chipcon AS
SmartRF
CC2420 Preliminary Datasheet (rev 1.2), 2004-06-09
Page 48 of 87
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| CC2420SK | 2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver |
| CC4V | SM WATCH CRYSTAL MIL TEMP |
| CC4V-T1 | SM WATCH CRYSTAL MIL TEMP |
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(píng)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(píng)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(píng)估:EM35x 頻率:2.4 GHz 接口類型:USB 工作電源電壓: |
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