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参数资料
| 型号： | SI4312-B10-GM |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 11/22页 |
| 文件大小： | 0K |
| 描述： | IC RX OOK 315/434MHZ 20VQFN |
| 特色产品： | Si4010 EZRadio? Wireless IC |
| 标准包装： | 490 |
| 系列： | EZRadio® |
| 频率： | 315MHz，434MHz |
| 灵敏度： | -110dBm |
| 数据传输率 - 最大： | 10 kBaud |
| 调制或协议： | OOK |
| 应用： | 车库门开启器，RKE，安全警报 |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 电源电压： | 2.7 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（3x3） |
| 包装： | 管件 |
| 产品目录页面： | 585 (CN2011-ZH PDF) |
| 其它名称： | 336-1977-5 |
Si4312
Since the OFF time = RATIO x BT and the values for RATIO are either 5 or 10, RATIO should be chosen such that
either the value of 5 or 10 x the BT[1:0] setting is just larger than the OFF time. For the PPM example shown in
Figure 4, BT[1:0] = (1,1) since BT = 100 μs. The actual OFF time is 900 μs; so, we would set pin 5 = 1 to get a
RATIO of 10 such that the calculated OFF time is BT[1:0] x RATIO = 100 μs x 10 = 1000 μs, which is greater than
the actual OFF time of 900 μs.
An alternative approach to choosing the RATIO bit (pin 5) is to choose the RATIO parameter such that the
threshold calculation window is greater than the actual ON plus OFF times using Table 11 and the values chosen
for BT[1:0].
Table 11. Threshold Calculation Window Times Based on RATIO and BT[1:0] Settings
RATIO
0
0
0
0
1
1
1
1
BT1
0
0
1
1
0
0
1
1
BT0
0
1
0
1
0
1
0
1
Threshold Calculation Window (ms)
7.500
3.750
1.500
0.750
13.750
6.875
2.750
1.375
3.6. Frequency Scanning
The channel bandwidth directly affects the sensitivity of any wireless receiver. Typical analog OOK receivers use
an external ceramic filter with a large bandwidth to accommodate the data rate, crystal tolerances, and transmit
carrier frequency offsets, which leads to unnecessary amounts of noise and lower sensitivity levels. The Si4312
uses a narrow channel bandwidth of 160 kHz and frequency scanning to obtain excellent sensitivity levels
(–110 dBm at data rate of 1 kbps at 315 MHz) while still accommodating up to ±210 kHz of scan bandwidth from its
operating frequency.
The frequency scan algorithm works by breaking the scan bandwidth (420 kHz) into three frequency bins
approximately 140 kHz wide and checking for transmit signal energy in each bin. Because the received signal
power can vary by large orders of magnitude depending on how close the transmitter is to the receiver, the
frequency algorithm may have to re-scan the frequency bins if the received power level saturates the receiver.
Three gain settings are used in the frequency scan algorithm denoted as high-, medium-, and low-gain.
The chip begins scanning the frequency in the highest receiver gain setting to find signals that have a receive
signal strength indicator (RSSI) level from sensitivity to about –70 dBm. If energy is detected in only one of these
frequency bands, it is double-checked again and deemed as the correct operating frequency band. Therefore, the
frequency scan algorithm takes at least two searches to find the correct frequency band. The scan time per
frequency bin search is equal to the threshold calculation window time as chosen by the RATIO and BT[1:0]
settings given in Table 11. Therefore, the best case frequency scan time is equal to two times the threshold
calculation window time.
In case the input signal is large while the gain is also large, the receiver could be overloaded; therefore, the
frequency scan algorithm follows a series of frequency and gain level settings based on measured RSSI as shown
in Figure 6. In the worst case, there are a total of nine frequency bin searches (three frequency bins times three
gain settings) plus one additional frequency re-scan because we don't know when the signal starts or for double
checking. Thus, the worst-case scan time is equal to 10 times the threshold calculation window time. Figure 6
shows the frequency scan algorithm broken into three frequency bins of 140 kHz and three gain settings.
Rev. 0.5
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI4312-B10-GMR | 功能描述:射频接收器 315/434 MHz OOK Receiver RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| SI4312-DB | 制造商:SILABS 制造商全称:SILABS 功能描述:Si4312 DEMO BOARD USERa??S GUIDE |
| SI4312-DK1 | 制造商:Silicon Laboratories Inc 功能描述: |
| SI4313 | 制造商:SILABS 制造商全称:SILABS 功能描述:Si4313 LOW-COST ISM RECEIVER |
| SI4313-B1 | 制造商:SILABS 制造商全称:SILABS 功能描述:Si4313 LOW-COST ISM RECEIVER |
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