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Si4312
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.
Table 8. Carrier Frequency Selection
Pin 6 (315/434)
0
1
Frequency [MHz]
433.92
315
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.
Digital Data
“1”
“0”
“1”
“1”
NRZ
Encoding
Manchester
Encoding
PPM
Encoding
1000 us
100 us
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 9. How to Choose BT[1:0] Based on the Bit Time
Bit Time [μs]
BT ≥ 1000
1000 < BT < 500
500 < BT < 200
200 < BT < 100
Filter Bandwidth [kHz]
1.5
3.0
7.5
15
Rev. 0.5
BT1 (pin 14)
0
0
1
1
BT0 (pin 15)
0
1
0
1
9
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