收藏本站
SX1211
WIRELESS & SENSING
In OOK mode, the RSSI evaluates the signal strength by sampling I(t) and Q(t) signals 16 times in each period of
the chosen IF2 frequency (refer to section 3.4.1). In FSK mode, the signals are sampled 16 times in each Fdev
period, Fdev being the frequency deviation of the companion transmitter. An average is then performed over a
sliding window of 16 samples. Hence, the RSSI output register RXParam_RSSI is updated 16 times in each Fdev
or IF2 period.
The following settings should be respected:
FSK Mode: Ensure that the Fdev parameter (as described in MCParam_Fdev) remains consistent with the
actual frequency deviation of the companion transmitter.
OOK reception: Ensure that the Fdev parameter (as described in MCParam_Fdev) is equal with the frequency
of I(t) and Q(t) signals, i.e. the second Intermediate Frequency, IF2, of the receiver (Note that this equals Fo,
the center frequency of the polyphase filter).
3.4.7.3. Dynamic Range
The dynamic range of the RSSI is over 70 dB, extending from the nominal sensitivity level. The IF gain setting
available in MCParam_IF_gain is used to achieve this dynamic range:
RSSI Response
180
160
140
120
100
80
60
40
20
0
-120
-100
-80
-60
-40
-20
0
Pin [dBm]
IF_Gain=00
IF_Gain=01
IF_Gain=10
IF_Gain=11
Figure 20: RSSI Dynamic Range
The RSSI response versus input signal is independent of the receiver filter bandwidth. However in the absence of
any input signal, the minimum value directly reflects upon the noise floor of the receiver, which is dependant on the
filter bandwidth of the receiver.
3.4.7.4. RSSI IRQ Source
The SX1211 can also be used to detect a RSSI level above a pre-configured threshold. The threshold is set in
IRQParam_RSSI_irq_thresh and the IRQ status stored in IRQParam_RSSI_irq (cleared by writing a “1”).
An interrupt can be mapped to the IRQ0 or IRQ1 pins via bits IRQParam_Rx_stby_irq0 or
IRQParam_Rx_stby_irq1. Figure 21 shows the timing diagram of the RSSI interrupt source, with
IRQParam_RSSI_irq_thresh set to 28.
Rev 8 – February 2013
Page 27 of 92
www.semtech.com
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
SX1223SK868 KIT STARTER FOR XE1223 868MHZ
SX1231-31SKB915 TVS
SX1240SKA433 TVS
SX1701BI085TRT IC AMP 2.5GHZ 5.3V 16-MLPQ
TA002-10002 LED HEATSINK W/FAN 12V 40X10MM
TC620HEPA IC TEMP SNSR 5V DUAL TRIP 8-DIP
TC623CVOA713 IC TEMP SNSR 3V DUAL TRIP 8-SOIC
TC624VOA IC TEMP SNSR PROG 2.7V 8SOIC
相关代理商/技术参数
SX1212 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Ultra-Low Power Integrated 300-510MHz Transceiver
SX1212-11SKA433 制造商:Semtech Corporation 功能描述:SX1212 433Mhz USB Kit With 2 SX1212-01SKA433SMA, Antenna Connector, RS232 Cable
SX1212-12SKA433 制造商:Semtech Corporation 功能描述:2 X SX1212SKA 制造商:Semtech Corporation 功能描述:Deluxe USB Starter Kit for SX1212, Includes Two USB Interface Boards at 433MHz 制造商:Semtech 功能描述:2 X SX1212SKA
SX1212-DK7A433 制造商:Semtech Corporation 功能描述:Evaluation Board for SX1212 Transceiver
SX1212IWLTRT 功能描述:IC TXRX 300MHZ-510MHZ 32-TQFN 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
SX1213 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Ultra-Low Power Integrated UHF Receiver
SX1213IWLTRT 制造商:Semtech Corporation 功能描述: 制造商:Semtech Corporation 功能描述:SX1213 Series 510 MHz 200 Kbps Ultra-Low Power Integrated UHF Receiver - TQFN-32
SX1223 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:425 - 475 MHz / 850 - 950 MHz Integrated UHF Transmitter