- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄25635 > MQ80C52XXX-25 (TEMIC SEMICONDUCTORS) 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQFP44 PDF資料下載
參數(shù)資料
| 型號： | MQ80C52XXX-25 |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQFP44 |
| 文件頁數(shù)： | 3/198頁 |
| 文件大?。?/td> | 4822K |
| 代理商： | MQ80C52XXX-25 |
第1頁第2頁當(dāng)前第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁
100
8111C–MCU Wireless–09/09
AT86RF231
tain LQI value. Since the packet error rate is a statistical value, the PER shown in Section 8-6
“Conditional Packet Error Rate versus LQI” on page 99 is based on a huge number of transac-
tions. A reliable estimation of the packet error rate cannot be based on a single or a small
number of LQI values.
8.6.2
Request an LQI Measurement
The LQI byte can be obtained after a frame has been received by the radio transceiver. One
additional byte is automatically attached to the received frame containing the LQI value. This
information can also be read via Frame Buffer read access, see Section 6.2.2 “Frame Buffer
Access Mode” on page 20. The LQI byte can be read after IRQ_3 (TRX_END) interrupt.
8.6.3
Data Interpretation
According to IEEE 802.15.4 a low LQI value is associated with low signal strength and/or high
signal distortions. Signal distortions are mainly caused by interference signals and/or multipath
propagation. High LQI values indicate a sufficient high signal power and low signal distortions.
Note, the received signal power as indicated by received signal strength indication (RSSI) value
or energy detection (ED) value of the AT86RF231 do not characterize the signal quality and the
ability to decode a signal.
As an example, a received signal with an input power of about 6 dB above the receiver sensitiv-
ity likely results in a LQI value close to 255 for radio channels with very low signal distortions.
For higher signal power the LQI value becomes independent of the actual signal strength. This
is because the packet error rate for these scenarios tends towards zero and further increased
signal strength, i.e. increasing the transmission power does not decrease the error rate any fur-
ther. In this case RSSI or ED can be used to evaluate the signal strength and the link margin.
ZigBee networks often require the identification of the "best" routing between two nodes. Both,
the LQI and the RSSI/ED can be used for this, dependent on the optimization criteria. If a low
packet error rate (corresponding to high throughput) is the optimization criteria then the LQI
value should be taken into consideration. If a low transmission power or the link margin is the
optimization criteria then the RSSI/ED value is also helpful.
Combinations of LQI, RSSI and ED are possible for routing decisions. As a rule of thumb RSSI
and ED values are useful to differentiate between links with high LQI values. Transmission links
with low LQI values should be discarded for routing decisions even if the RSSI/ED values are
high. This is because RSSI/ED does not say anything about the possibility to decode a signal. It
is only an information about the received signal strength whereas the source can be an
interferer.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MD80C52EXXX-20SB | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CDIP40 |
| MD80C52EXXX-16SBD | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 |
| MD80C52EXXX-20SB | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CDIP40 |
| MQ80C32E-36SC | 8-BIT, 36 MHz, MICROCONTROLLER, CQFP44 |
| MR80C52XXX-20:R | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MQ82370-20 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MQ8238020 | 制造商:Intel 功能描述:CONTROLLER: OTHER |
| MQ82380-20 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MQ82380-20/R | 制造商:Rochester Electronics LLC 功能描述: |
| MQ82592 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。