参数资料
型号: EM260-RTR
厂商: Silicon Laboratories Inc
文件页数: 22/50页
文件大小: 0K
描述: IC ZIGBEE SYSTEM-ON-CHIP 40-QFN
标准包装: 1
频率: 2.4GHz
数据传输率 - 最大: 250kbps
调制或协议: 802.15.4
应用: ZigBee?
功率 - 输出: -32dBm ~ 3dBm
灵敏度: -97dBm
电源电压: 2.1 V ~ 3.6 V
电流 - 接收: 30mA
电流 - 传输: 34mA
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: 40-VFQFN 裸露焊盘
包装: 标准包装
配用: 636-1009-ND - PROGRAMMER USB FLASH EM250/260
其它名称: 636-1007-6
EM260
5 SPI Protocol
The EM260 Low Level Protocol centers on the SPI interface for communication with a pair of GPIO for
handshake signaling.
The EM260 looks like a hardware peripheral.
The EM260 is the slave device and all transactions are initiated by the Host (the master).
The EM260 supports a reasonably high data rate.
5.1
Physical Interface Configuration
The EM260 supports both SPI Slave Mode 0 (clock is idle low, sample on rising edge) and SPI Slave Mode 3
(clock is idle high, sample on rising edge) at a maximum SPI clock rate of 5MHz, as illustrated in Figure 4. The
convention for the waveforms in this document is to show Mode 0.
Clock, Mode 0 (SCLK)
Clock, Mode 3 (SCLK)
Host – Master (MOSI)
EM260 – Slave (MISO)
MSB
MSB
LSB
LSB
Figure 4. SPI Transfer Format, Mode 0 and Mode 3
The nHOST_INT signal and the nWAKE signal are both active low. The Host must supply a pull-up resistor on
the nHOST_INT signal to prevent errant interruptions during undefined events such as the EM260 resetting.
The EM260 supplies an internal pull-up on the nWAKE signal to prevent errant interruptions during undefined
events such as the Host resetting.
5.2
SPI Transaction
The basic EM260 SPI transaction is half-duplex to ensure proper framing and to give the EM260 adequate
response time. The basic transaction, as shown in Figure 5, is composed of three sections: Command, Wait,
and Response. The transaction can be considered analogous to a function call. The Command section is the
function call, and the Response section is the return value.
nHOST_INT
nSSEL
MOSI
MISO
SCLK
Command
Wait
Response
Figure 5. General Timing Diagram for a SPI Transaction
120-0260-000M Rev 1.1
Page 22
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