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SI4312-B10-GM Fiches technique(PDF) 9 Page - Silicon Laboratories

No de pièce SI4312-B10-GM
Description  315/433.92 MHZ OOK RECEIVER
Download  22 Pages
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Fabricant  SILABS [Silicon Laboratories]
Site Internet  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI4312-B10-GM Fiches technique(HTML) 9 Page - Silicon Laboratories

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Si4312
Rev. 0.5
9
3.3. Carrier Frequency Selection
The Si4312 can be tuned to either 315 or 433.92 MHz by driving Pin 6 (315/434) to VDD or GND. The 315 MHz
operation is chosen by driving Pin 6 (315/434) to VDD, and 433.92 MHz operation is chosen by driving Pin 6
(315/434) to GND.
3.4. Bit Time BT[1:0] Selection
The Si4312 can operate with data rates of up to 10 kbps non-return to zero (NRZ) data or 5 kbps Manchester
encoded data. However, OOK modulation uses other encoding schemes such as pulse width modulation (PWM)
and pulse position modulation (PPM) where a bit can be encoded into a pulse with a certain duty cycle or pulse
width as shown in Figure 4.
Figure 4. Example Data Waveforms
In order to set the data filter bandwidth correctly, the shortest pulse width of the transmitted encoded data should
be chosen as the bit time. In the PPM example shown in Figure 4, the shortest pulse width is 100 µs; so, the bit
time is chosen as BT = 100 µs even though the actual data rate is 1 kbps (1000 µs). After finding BT, Table 9 can
be used to find the bit settings for pins 14 and 15, BT[1:0]. In this PPM example, BT[1:0] is set as logic BT1 = 1 and
BT0 = 1 or BT[1:0] = (1,1) since BT = 100 µs.
Table 8. Carrier Frequency Selection
Pin 6 (315/434)Frequency [MHz]
0
433.92
1315
Table 9. How to Choose BT[1:0] Based on the Bit Time
Bit Time [µs]
Filter Bandwidth [kHz]
BT1 (pin 14)
BT0 (pin 15)
BT
≥ 1000
1.5
0
0
1000 < BT < 500
3.0
0
1
500 < BT < 200
7.5
1
0
200 < BT < 100
15
1
1
NRZ
Encoding
Digital Data
Manchester
Encoding
PPM
Encoding
“1”
“0”
“1”
“1”
1000 us
100 us


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