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| 型号： | EM260-BBRD-128K-USART-R |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 35/50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
6 UART Gateway Protocol
The UART Gateway protocol is designed for network gateway systems in which the host processor is running a
full-scale operating system such as embedded Linux or Windows. The host sends EmberZNet Serial Protocol
(EZSP) commands to the UART interface using the Ember Asynchronous Serial Host (ASH) protocol. The EZSP
commands are the same as those used in the SPI protocol, but the SPI protocol is better suited for resource-
constrained microcontroller hosts since ASH uses considerably more host RAM and program storage.
ASH implements error detection/recovery and tolerates latencies on multi-tasking hosts due to scheduling and
I/O buffering. The ASH protocol is described in detail in document UG101, UART Gateway Protocol Reference .
Silicon Labs supplies ASH host software in source form compatible with Linux and Windows. In most cases it
will need only a few simple edits to adapt it to a particular host system.
TXD
RXD
Data
RXD
TXD
HOST
nCTS
Flow Control
nRTS
EM260
nRTS
GPIO
nCTS
nRESET
Figure 13. UART Interface Signals
The UART hardware interface uses the following EM260 signals:
?
?
?
Serial data: TXD and RXD
The ASH protocol sends data in both directions, so both TXD and RXD signals are required. An external
pull-up resistor should be connected to TXD to avoid data glitches while the EM260 is resetting.
Flow control: nRTS and nCTS (optional)
ASH uses hardware handshaking for flow control: nRTS enables transmission from the host to the
EM260, and nCTS enables EM260 transmissions to the host. If the host serial port cannot support
RTS/CTS, XON/XOFF flow control may be used instead. But, XON/XOFF will deliver slightly lower
performance.
When using hardware flow control, the EM260’s nRTS must be able to control host serial output.
However, in many gateway systems, the host will not need to throttle transmission by the EM260. In
those systems nCTS may be left unconnected since it has an internal pull-down and will be
continuously asserted.
Reset control: nRESET
The host must be able to reset the EM260 to run the ASH protocol. The best way to do this is to use a
host output connected to nRESET. If this is not feasible, the host can send a special ASH frame that
requests the EM260 to reboot, but this method is less reliable than asserting nRESET and is not
recommended for normal use.
Page 35
120-0260-000M Rev 1.1
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相关代理商/技术参数 |
参数描述 |
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| 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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