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SI4312-B10-GM Fiches technique(PDF) 9 Page - Silicon Laboratories |
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SI4312-B10-GM Fiches technique(HTML) 9 Page - Silicon Laboratories |
9 / 22 page 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 |
Numéro de pièce similaire - SI4312-B10-GM |
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Description similaire - SI4312-B10-GM |
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