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参数资料
| 型号： | SX1212IWLTRT |
| 厂商： | Semtech |
| 文件页数： | 53/77页 |
| 文件大小： | 0K |
| 描述： | IC TXRX 300MHZ-510MHZ 32-TQFN |
| 标准包装： | 1 |
| 频率： | 300MHz ~ 510MHz |
| 数据传输率 - 最大： | 150kbps |
| 调制或协议： | FSK，OOK |
| 应用： | AMR，ISM，家庭自动化，程序控制 |
| 功率 - 输出： | 12.5dBm |
| 灵敏度： | -110dBm |
| 电源电压： | 2.1 V ~ 3.6 V |
| 电流 - 接收： | 3mA |
| 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-TQFN |
| 包装： | 标准包装 |
| 产品目录页面： | 584 (CN2011-ZH PDF) |
| 其它名称： | SX1212IWLDKR |
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SX1212
ADVANCED COMMUNICATIONS & SENSING
Please note that the received length byte, as part of the payload, is not stripped off the packet and is made
available in the FIFO.
To disable this function the user should set the value of the PKTParam_Payload_length to the value of the FIFO
size selected.
5.5.5.4. CRC Based
The CRC check is enabled by setting bit PKTParam_CRC_on. It is used for checking the integrity of the message.
On Tx side a two byte CRC checksum is calculated on the payload part of the packet and appended to the end
of the message.
On Rx side the checksum is calculated on the received payload and compared with the two checksum bytes
received. The result of the comparison is stored in the PKTParam_CRC_status bit and CRC_OK IRQ source.
By default, if the CRC check fails then the FIFO is automatically cleared and no interrupt is generated. This filtering
function can be disabled via PKTParam_CRC_autoclr bit and in this case, even if CRC fails, the FIFO is not
cleared and only Payload_ready interrupt goes high. Please note that in both cases, the two CRC checksum bytes
are stripped off by the packet handler and only the payload is made available in the FIFO.
The CRC is based on the CCITT polynomial as shown in Figure 45. This implementation also detects errors due to
leading and trailing zeros.
data input
CRC Polynomial =X 16 + X 12 + X 5 + 1
X 15
X 14
X 13
X 12
X 11
***
X 5
X 4
***
X 0
Figure 45: CRC Implementation
5.5.6. DC-Free Data Mechanisms
The payload to be transmitted may contain long sequences of 1’s and 0’s, which introduces a DC bias in the
transmitted signal. The radio signal thus produced has a non uniform power distribution over the occupied channel
bandwidth. It also introduces data dependencies in the normal operation of the demodulator. Thus it is useful if the
transmitted data is random and DC free.
For such purposes, two techniques are made available in the packet handler: Manchester encoding and data
whitening. Please note that only one of the two methods should be enabled at a time.
5.5.6.1. Manchester Encoding
Manchester encoding/decoding is enabled by setting bit PKTParam_Manchester_on and can only be used in
Packet mode.
The NRZ data is converted to Manchester code by coding ‘1’ as “10” and ‘0’ as “01”.
In this case, the maximum chip rate is the maximum bit rate given in the specifications section and the actual bit
rate is half the chip rate.
Rev 2 – June 18th, 2009
Page 53 of 77
www.semtech.com
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相关代理商/技术参数 |
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|---|---|
| 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 |
| SX1223I073 | 制造商:Semtech Corporation 功能描述:SX Series 425 to 950 MHz 153.6 kbps SMT Integrated UHF Transmitter - TQFN-24 制造商:SEMTECH 功能描述:SX Series 425 to 950 MHz 153.6 kbps SMT Integrated UHF Transmitter - TQFN-24 |
| SX1223I073TRT | 功能描述:IC TX UHF 433/868/916 MHZ 24TQFN RoHS:是 类别:RF/IF 和 RFID >> RF 发射器 系列:- 标准包装:4,000 系列:- 频率:310MHz ~ 440MHz 应用:- 调制或协议:UHF，ASK 数据传输率 - 最大:20 kBaud 功率 - 输出:1dBm ~ 5dBm 电流 - 传输:10mA 数据接口:PCB，表面贴装 天线连接器:PCB，表面贴装 存储容量:- 特点:- 电源电压:2.2 V ~ 4 V 工作温度:-40°C ~ 85°C 封装/外壳:16-LSSOP（0.154"，3.90mm 宽） 包装:带卷 (TR) |
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