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参数资料
| 型号： | EM260-BBRD-128K-USART-R |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 15/50页 |
| 文件大小： | 0K |
| 描述： | EM260 BREAKOUT BOARD |
| 标准包装： | 12 |
| 类型： | 收发器，802.15.4/Zigbee |
| 频率： | 2.4GHz |
| 适用于相关产品： | EM260 |
| 其它名称： | 636-1026 |
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EM260
4 Functional Description
The EM260 connects to the Host platform through either a standard SPI interface or a standard UART
interface. The EmberZNet Serial Protocol (EZSP) has been defined to allow an application to be written on a
host platform of choice. Therefore, the EM260 comes with a license to EmberZNet PRO, Silicon Labs’ ZigBee-
compliant software stack. The following brief description of the hardware modules provides the necessary
background on the operation of the EM260. For more information, contact .
4.1
Receive (RX) Path
The EM260 RX path spans the analog and digital domains. The RX architecture is based on a low-IF, super-
heterodyne receiver. It utilizes differential signal paths to minimize noise interference. The input RF signal is
mixed down to the IF frequency of 4MHz by I and Q mixers. The output of the mixers is filtered and combined
prior to being sampled by a 12Msps ADC. The RX filtering within the RX path has been designed to optimize the
co-existence of the EM260 with other 2.4GHz transceivers, such as the IEEE 802.11g and Bluetooth.
4.1.1
RX Baseband
The EM260 RX baseband (within the digital domain) implements a coherent demodulator for optimal
performance. The baseband demodulates the O-QPSK signal at the chip level and synchronizes with the IEEE
802.15.4-2003 preamble. An automatic gain control (AGC) module adjusts the analog IF gain continuously
(every ? symbol) until the preamble is detected. Once the packet preamble is detected, the IF gain is fixed
during the packet reception. The baseband de-spreads the demodulated data into 4-bit symbols. These
symbols are buffered and passed to the hardware-based MAC module for filtering.
In addition, the RX baseband provides the calibration and control interface to the analog RX modules,
including the LNA, RX Baseband Filter, and modulation modules. The EmberZNet PRO software includes
calibration algorithms which use this interface to reduce the effects of process and temperature variation.
4.1.2
RSSI and CCA
The EM260 calculates the RSSI over an 8-symbol period as well as at the end of a received packet. It utilizes
the RX gain settings and the output level of the ADC within its algorithm. The linear range of RSSI is specified
to be 40dB over all temperatures. At room temperature, the linear range is approximately 60dB (-90 dBm to -
30dBm).
The EM260 RX baseband provides support for the IEEE 802.15.4-2003 required CCA methods summarized in
Table 10. Modes 1, 2, and 3 are defined by the 802.15.4-2003 standard; Mode 0 is a proprietary mode.
Table 10. CCA Mode Behavior
CCA Mode
0
1
2
3
Mode Behavior
Clear channel reports busy medium if either carrier sense OR RSSI exceeds their thresholds.
Clear channel reports busy medium if RSSI exceeds its threshold.
Clear channel reports busy medium if carrier sense exceeds its threshold.
Clear channel reports busy medium if both RSSI and carrier sense exceed their thresholds.
The EmberZNet PRO Software Stack sets the CCA Mode, and it is not configurable by the Application Layer. For
software versions beginning with EmberZNet 2.5.4, CCA Mode 1 is used, and a busy channel is reported if the
RSSI exceeds its threshold. For software versions prior to 2.5.4, the CCA Mode was set to 0.
At RX input powers higher than –25dBm, there is some compression in the receive chain where the gain is not
properly adjusted. In the worst case, this has resulted in packet loss of up to 0.1%. This packet loss can be
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120-0260-000M Rev 1.1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EM260-DEV | 功能描述:KIT DEV FOR EM260 RoHS:否 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:InSight 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796 |
| EM260-RCM-USART-R | 功能描述:EM260 RCM BOARD RoHS:是 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:- 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796 |
| EM260-RTR | 功能描述:IC ZIGBEE SYSTEM-ON-CHIP 40-QFN RoHS:是 类别:RF/IF 和 RFID >> RF 收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:30 系列:- 频率:4.9GHz ~ 5.9GHz 数据传输率 - 最大:54Mbps 调制或协议:* 应用:* 功率 - 输出:-3dBm 灵敏度:- 电源电压:2.7 V ~ 3.6 V 电流 - 接收:* 电流 - 传输:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 工作温度:-25°C ~ 85°C 封装/外壳:68-TQFN 裸露焊盘 包装:管件 |
| EM260-RTY | 功能描述:IC ZIGBEE SYSTEM-ON-CHIP 40-QFN RoHS:是 类别:RF/IF 和 RFID >> RF 收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:30 系列:- 频率:4.9GHz ~ 5.9GHz 数据传输率 - 最大:54Mbps 调制或协议:* 应用:* 功率 - 输出:-3dBm 灵敏度:- 电源电压:2.7 V ~ 3.6 V 电流 - 接收:* 电流 - 传输:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 工作温度:-25°C ~ 85°C 封装/外壳:68-TQFN 裸露焊盘 包装:管件 |
| EM260-USART-JMP-R | 功能描述:KIT JUMP START FOR EM260 RoHS:否 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:JumpStart 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796 |
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