A N 6 3 3
72
Rev. 0.7
After the radio is configured to the receiver state, the PLL will be settled within 50 µs, followed by the RX settling
time. Depending on whether the AFC is used or not, the RX settling time can last an extra 8 or 16 bits time. If the
RSSI detection method is used, please consider the RSSI settling time which is an additional 4 bits time. If the
frequency hopping system is not time synchronized, then the transmitter can send a packet occasionally while the
receiver is continuously scanning the channels. The best approach is to transmit the preamble as long as it takes to
scan all channels. That ensures that the receiver will find the preamble and will be able to receive the packet
independently on whichever channel it is transmitted. The required minimum preamble length can be calculated as
follows:
1. If the RSSI timeout method is used:
2. If the Preamble timeout method is used:
This following figure shows the receiver timing behavior if both the preamble and the RSSI conditions are used.
Figure 53. Calculation of the Minimum Preamble Length
3. If the RSSI timeout, the preamble timeout, and the sync word invalid timeout methods are used:
min
bit
preamble length
PLL_settling_time
data_rate
RX_settling_time
RSSI_settling_time
RSSI_timeout
+
+
+
Number_of_Channels_to_scan
=
min
bit
preamble length
PLL_settling_time
data_rate
RX_settling_time
Preamble_timeout
+
+
Number_of_Channels_to_scan
=
min
bit
preamble length
PLL_settling_time
data_rate
RX_settling_time
RSSI_settling_time
RSSI_timeout
Preamble_timeout
Invalid_sync_timeout
+
+
+
+
+
Number_of_Channels_to_scan
=
Содержание EZRADIOPRO Si4060
Страница 24: ...AN633 24 Rev 0 7 Figure 20 Supply Current versus Time Diagram from Shutdown to RX State...
Страница 67: ...AN633 Rev 0 7 67 Figure 48 Variable Length Packet Reception Flowchart...
Страница 69: ...AN633 Rev 0 7 69 Figure 50 Packet Matching Reception Flowchart...
Страница 73: ...AN633 Rev 0 7 73 Figure 54 Packet Reception with Automatic RX Hopping Flowchart...
Страница 75: ...AN633 Rev 0 7 75 Figure 56 Packet Reception with Manual Rx Hopping...
Страница 80: ...AN633 80 Rev 0 7 Figure 62 Long Packet Transmission Workflow...
Страница 81: ...AN633 Rev 0 7 81 Figure 63 Long Packet RX Flowchart...