参数资料
型号: AT86RF212-ZUR
厂商: Atmel
文件页数: 140/172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
Table 9-10. Register 0x06 (PHY_RSSI)
Bit
Name
Read/Write
Reset Value
Bit
Name
Read/Write
Reset Value
7
RX_CRC_VALID
R
0
3
RSSI[3]
R
0
6
RND_VALUE[1]
R
0
2
RSSI[2]
R
0
5
RND_VALUE[0]
R
0
1
RSSI[1]
R
0
4
RSSI[4]
R
0
0
RSSI[0]
R
0
? Bit 7 – RX_CRC_VALID
Refer to section 6.3.5.
? Bit 6:5 – RND_VALUE
The 2-bit random value can be retrieved by reading register bits RND_VALUE. Note
that the radio transceiver shall be in one of the Basic Operating Mode receive states.
? Bit 4:0 – RSSI
Refer to section 6.4.4.
9.3 Differential Output supporting Software controlled Antenna Diversity
Digital output pins DIG1 and DIG2 can be used to drive a general purpose differential
signal. The following sections describe software controlled antenna diversity as one
possible application.
9.3.1 Overview
Due to multipath propagation effects between network nodes, the receive signal
strength may vary and affects the link quality, even for small changes of the antenna
location. These fading effects can result in an increased error floor or loss of the
connection between devices.
To improve the reliability of a RF connection between network nodes, antenna diversity
can be applied to reduce effects of multipath propagation and fading. Antenna diversity
uses two antennas to select the most reliable RF signal path. To ensure highly
independent receive signals on both antennas, the antennas should be carefully
separated from each other.
The AT86RF212 supports software controlled antenna diversity, i.e. the microcontroller
controls which antenna is used for transmission and reception. This is done by register
settings.
Antenna Diversity can be used in Basic and Extended Operating Modes and can also
be combined with other features and operating modes like High Data Rate Modes and
RX/TX Indication.
9.3.2 Application Example
A block diagram for a typical application is shown in Figure 9-6.
The use of pins 9 and 10 (DIG 1 and DIG2) for Antenna Diversity is enabled by
ANT_EXT_SW_EN = 1 (register 0x0D, ANT_DIV). In this case, the internal connection
of the control pins 9 and 10 to digital ground is disabled (refer to section 2.2.2), and
they provide a differential control signal to the antenna switch (SW1).
140
AT86RF212
8168C-MCU Wireless-02/10
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