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S2-LP bảng dữ liệu(PDF) 70 Page - STMicroelectronics

tên linh kiện S2-LP
Giải thích chi tiết về linh kiện  Excellent receiver selectivity and blocking
PDF  90 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

S2-LP bảng dữ liệu(HTML) 70 Page - STMicroelectronics

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Figure 21: CSMA with persistent mode if channel is busy (timeline)
If the channel is busy and persistent_mode bit is 0, the device will check the channel for the
Tcca period. At the end, being the CS (carrier sense) signal high, it will switch in SLEEP for
a randomic time that can last
������������������������ = ���������������� ∗ (6 + rand(0: 2(��������+1)) ∗ (���������������������������� + 1)), with
NB=0.
At the end of this period, it will again switch to RX for another Tcca, then sleep and so on
until the number of backoff set is reached. At that point, an interrupt MAX_BO_REACHED
will be notified to the MCU:
Figure 22: CSMA with non-persistent mode if channel is busy (timeline)
Finally, if the channel becomes free (for example during one of the SLEEP times), the
device must assert channel free for a number of NUM._OF_CCA_PERIOD (T. listen)
before transmitting:
Figure 23: CSMA with non-persistent mode if channel becomes free (timeline)



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