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参数资料
型号： AT86RF212-ZUR
厂商： Atmel
文件页数： 91/172页
文件大小： 0K
描述： TXRX AVR LOW PWR/VOLTAGE 32PQFN
标准包装： 1
频率： 700MHz，800MHz，900MHz
数据传输率 - 最大： 250kbps
调制或协议： 802.15.4 Zigbee，6LoWPAN，ISM
应用： ISM，ZigBee?
功率 - 输出： 10dBm
灵敏度： -110dBm
电源电压： 1.8 V ~ 3.6 V
电流 - 接收： 9.2mA
电流 - 传输： 25mA
数据接口： PCB，表面贴装
天线连接器： PCB，表面贴装
工作温度： -40°C ~ 85°C
封装/外壳： 32-VFQFN 裸露焊盘
包装： 标准包装
其它名称： AT86RF212-ZURDKR
AT86RF212
6.8 Link Quality Indication (LQI)
6.8.1 Requirements
The IEEE 802.15.4 standard defines the LQI as a characterization of the strength
and/or quality of a received frame. The use of the LQI result by the network or
application layer is not specified in this standard. The LQI value shall be an integer
ranging from 0 to 255, with at least 8 unique values. The minimum and maximum LQI
values (0 and 255) should be associated with the lowest and highest quality compliant
signals, respectively, and LQI values in between should be uniformly distributed
between these two limits.
6.8.2 Implementation
During symbol detection within frame reception, the AT86RF212 uses correlation
results of multiple symbols in order to compute an estimate of the LQI value. This is
motivated by the fact that the mean value of the correlation result is inversely related to
the probability of a detection error.
LQI computation is automatically performed for each received frame, once the SHR has
been detected. LQI values are integers ranging from 0 to 255 as required by the IEEE
802.15.4 standard.
6.8.3 Obtaining the LQI Value
The LQI value is available, once the corresponding frame has been completely
received. This is indicated by the interrupt IRQ_3 (TRX_END). The value can be
obtained by means of a frame buffer read access, see section 4.3.2.
6.8.4 Remarks
The reason for a low LQI value can be twofold: a low signal strength and/or high signal
distortions, e.g. by interference and/or multipath propagation. High LQI values,
however, indicate a sufficient signal strength and low signal distortions.
Note that the LQI value is almost always 255 for scenarios with very low signal
distortions and a signal strength much greater than the sensitivity level. In this case, the
packet error rate tends towards zero and increase of the signal strength, i.e. by
increasing the transmission power, cannot decrease the error rate any further.
Received signal strength indication (RSSI) or energy detection (ED) can be used to
evaluate the signal strength and the link margin.
ZigBee networks often require identification of the “best” routing between two nodes.
LQI and RSSI/ED can be applied, depending on the optimization criteria. If a low frame
error rate (corresponding to a high throughput) is the optimization criteria, then the LQI
value should be taken into consideration. If, however, the target is a low transmission
power, then the RSSI/ED value is also helpful.
Various combinations of LQI and RSSI/ED are possible for routing decisions. As a rule
of thumb, information on RSSI/ED is useful in order to differentiate between links with
high LQI values. However, transmission links with low LQI values should be discarded
for routing decisions, even if the RSSI/ED values are high, since it is merely an
information about the received signal strength, whereas the source can be an interferer.
91
8168C-MCU Wireless-02/10
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AT86RF215IQ-ZUR 功能描述:IC RF TXRX 802.15.4/ISM 48-VFQFN 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:在售 类型:仅限 TxRx 射频系列/标准:802.15.4，通用 ISM < 1GHz 协议:- 调制:FSK，OFDM，O-QPSK 频率:389.5MHz ~ 510MHz，779MHz ~ 1.02GHz，2.4GHz 数据速率（最大值）:2.4Mbps 功率 - 输出:16dBm 灵敏度:-123dBm 存储容量:- 串行接口:SPI 电压 - 电源:1.8 V ~ 3.6 V 电流 - 接收:5mA ~ 33mA 电流 - 传输:62mA ~ 64mA 工作温度:-40°C ~ 85°C 封装/外壳:48-VFQFN 裸露焊盘 标准包装:1
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AT86RF215M-ZUR 功能描述:IC RF TxRx Only General ISM < 1GHz 389.5MHz ~ 510MHz, 779MHz ~ 1.02GHz 48-VFQFN Exposed Pad 制造商:atmel 系列:- 包装:剪切带（CT） 零件状态:停产 类型:仅限 TxRx 射频系列/标准:通用 ISM < 1GHz 协议:- 调制:FSK，OFDM，O-QPSK 频率:389.5MHz ~ 510MHz，779MHz ~ 1.02GHz 数据速率（最大值）:2.4Mbps 功率 - 输出:16dBm 灵敏度:-123dBm 存储容量:- 串行接口:SPI GPIO:- 电压 - 电源:1.8 V ~ 3.6 V 电流 - 接收:5mA ~ 33mA 电流 - 传输:62mA ~ 64mA 工作温度:-40°C ~ 85°C 封装/外壳:48-VFQFN 裸露焊盘 标准包装:1
AT86RF215-ZU 功能描述:IC RF TXRX 802.15.4/ISM 48-VFQFN 制造商:microchip technology 系列:- 包装:托盘 零件状态:在售 类型:仅限 TxRx 射频系列/标准:802.15.4，通用 ISM < 1GHz 协议:- 调制:FSK，OFDM，O-QPSK 频率:389.5MHz ~ 510MHz，779MHz ~ 1.02GHz，2.4GHz 数据速率（最大值）:2.4Mbps 功率 - 输出:16dBm 灵敏度:-123dBm 存储容量:- 串行接口:SPI 电压 - 电源:1.8 V ~ 3.6 V 电流 - 接收:5mA ~ 33mA 电流 - 传输:62mA ~ 64mA 工作温度:-40°C ~ 85°C 封装/外壳:48-VFQFN 裸露焊盘 标准包装:260
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