参数资料
型号: AT86RF212-ZU
厂商: Atmel
文件页数: 88/172页
文件大小: 0K
描述: IC TXRX ZIGBE/802.15.4/ISM 32QFN
产品培训模块: MCU Wireless Solutions Product Line Introduction
标准包装: 2,450
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: 托盘
Note that IEEE 802.15.4–2006 CCA mode 3 defines the logical combination of CCA
mode 1 and 2 with the logical operators AND or OR. This can be selected with:
o
o
CCA_MODE = 0
CCA_MODE = 3
for logical operation OR, and
for logical operation AND.
? Bit 4:0 – CHANNEL
Refer to section 7.8.6.
Register 0x09 (CCA_THRES) :
This register sets the ED threshold level for CCA.
Table 6-35. Register 0x09 (CCA_THRES)
Bit
Name
Read/Write
Reset Value
Bit
Name
Read/Write
Reset Value
7
Reserved
R/W
0
3
CCA_ED_THRES
R/W
0
6
Reserved
R/W
1
2
CCA_ED_THRES
R/W
1
5
Reserved
R/W
1
1
CCA_ED_THRES
R/W
1
4
Reserved
R/W
1
0
CCA_ED_THRES
R/W
1
? Bit 7:4 – Reserved
? Bit 3:0 – CCA_ED_THRES
For CCA_MODE = 1, a busy channel is indicated if the measured received power is
above (RSSI_BASE_VAL + 2.07 ? CCA_ED_THRES) [dBm]. CCA modes 0 and 3 are
logically related to this result.
6.7 Listen Before Talk (LBT)
6.7.1 Overview
Equipment using the AT86RF212 shall conform to the established regulations. With
respect to the regulations in Europe, CSMA-CA based transmission according to IEEE
802.15.4 is not appropriate. In principle, transmission is subject to low duty cycles (0.1
to 1 %). However, according to [5], equipment employing listen before talk (LBT) and
adaptive frequency agility (AFA) does not have to comply with duty cycle conditions.
Hence, LBT can be attractive in order to reduce network latency.
Minimum Listening Time
A device with LBT needs to comply with a minimum listening time, refer to section
9.1.1.2 of [5]. Prior transmission, the device must listen for a receive signal at or above
the LBT threshold level to determine whether the intended channel is available for use,
unless transmission is pursuing acknowledgement.
A device using LBT needs to listen for a fixed period of 5 ms. If the channel is free after
this period, transmission may immediately commence (i.e. no CSMA is required).
Otherwise, a new listening period of a randomly selected time span between 5 and 10
ms is required. The time resolution shall be approximately 0.5 ms. The last step needs
to be repeated until a free channel is available.
88
AT86RF212
8168C-MCU Wireless-02/10
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