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PM0237 bảng dữ liệu(PDF) 10 Page - STMicroelectronics

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Bluetooth low energy technology
PM0237
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DocID027104 Rev 2
2402 + k * 2 MHz, where k = 0..39;
There are two channels types:
1.
Advertising channels that use three fixed RF channels (37, 38 and 39) for:
a)
Advertising channel packets
b)
Packets used for discoverability/connectability
c)
Used for broadcasting/scanning
2.
Data physical channel uses the other 37 RF channels for bidirectional communication
between connected devices.
BLE is an Adaptive Frequency Hopping (AFH) technology that can use only a subset of all
the available frequencies in order to avoid the frequencies used by other no-adaptive
technologies. This allows to move from a bad channel to a known good channel by using a
specific frequency hopping algorithm which determines the next good channel to be used.
Table 1. BLE RF channel types and frequencies
Channel index
RF center frequency
Channel type
37
2402 MHz
Advertising channel
0
2404 MHz
Data channel
1
2406 MHz
Data channel
….
….
Data channel
10
2424 MHz
Data channel
38
2426 MHz
Advertising channel
11
2428 MHz
Data channel
12
2430 MHz
Data channel
….
….
Data channel
36
2478 MHz
Data channel
39
2480 MHz
Advertising channel



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