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參數(shù)資料
| 型號(hào)： | EM2420TR |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver |
| 中文描述： | 2.4 GHz IEEE 802.15.4標(biāo)準(zhǔn)/ ZigBee的射頻收發(fā)器 |
| 文件頁(yè)數(shù)： | 49/89頁(yè) |
| 文件大?。?/td> | 1758K |
| 代理商： | EM2420TR |
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EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 49 of 89
Link Quality Indication
The
measurement is a characterization 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. The
EM2420
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 the
EM2420
does not do chip
decision.
As described in the Frame check
sequence section on page 35, 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 the
EM2420
.
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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EM242302 | 功能描述:柵欄接線(xiàn)端子 EURO MC421-38102 TERM RoHS:否 制造商:TE Connectivity / AMP 產(chǎn)品:Barrier Terminal Blocks 系列: 類(lèi)型:Dual Barrier, Flat Block without Mounting Ears 節(jié)距:9.53 mm 位置/觸點(diǎn)數(shù)量:2 線(xiàn)規(guī)量程:22-12 電流額定值:20 A 電壓額定值:300 V 安裝風(fēng)格:Through Hole 安裝角:Vertical 端接類(lèi)型:Screw 觸點(diǎn)電鍍:Tin |
| EM242303 | 功能描述:柵欄接線(xiàn)端子 EURO MC421-38103 TERM RoHS:否 制造商:TE Connectivity / AMP 產(chǎn)品:Barrier Terminal Blocks 系列: 類(lèi)型:Dual Barrier, Flat Block without Mounting Ears 節(jié)距:9.53 mm 位置/觸點(diǎn)數(shù)量:2 線(xiàn)規(guī)量程:22-12 電流額定值:20 A 電壓額定值:300 V 安裝風(fēng)格:Through Hole 安裝角:Vertical 端接類(lèi)型:Screw 觸點(diǎn)電鍍:Tin |
| EM242608H | 功能描述:可插拔接線(xiàn)端子 EuroMag Pluggable Terminal Block RoHS:否 制造商:Phoenix Contact 產(chǎn)品:Plugs 系列:PTS 端接類(lèi)型:Spring Cage 位置/觸點(diǎn)數(shù)量:5 線(xiàn)規(guī)量程:26-14 節(jié)距:5 mm 電流額定值:10 A 電壓額定值:250 V 安裝風(fēng)格: 安裝角: 觸點(diǎn)電鍍: |
| EM-24346-C36 | 功能描述:麥克風(fēng) 3.61 X 3.61 X 2.21MM -52 SENS, 12SL PORT RoHS:否 制造商:Knowles Acoustics 方向性:Omnidirectional 阻抗:4.4 K Ohms 工作電壓:0.9 V to 10 V 靈敏度:- 53 dB 端接類(lèi)型:Wire Leads 長(zhǎng)度:5.56 mm 寬度:3.98 mm 深度:2.21 mm |
| EM-24346-D65 | 功能描述:100Hz ~ 10kHz Analog Microphone Electret Condenser 1.3V Omnidirectional (-52dB ±3dB @ 74dB SPL) Solder Pads 制造商:knowles 系列:EM 包裝:托盤(pán) 零件狀態(tài):有效 類(lèi)型:駐極體電容 輸出類(lèi)型:模擬 方向:全向 頻率范圍:100Hz ~ 10kHz 靈敏度:-52dB ±3dB @ 74dB SPL 信噪比:- 阻抗:4.4 千歐 電壓 - 額定:1.3V 電壓范圍:0.9 ~ 3V 電流 - 電源:50μA 端口位置:側(cè)面 密封等級(jí):無(wú) 端接:焊盤(pán) 大小/尺寸:3.57mm 長(zhǎng) x 3.57mm 寬 高度（最大值）:2.21mm 形狀:方形 標(biāo)準(zhǔn)包裝:25 |
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