PM0237 datasheet(10/88 Pages) STMICROELECTRONICS

10 / 88 page

Bluetooth low energy technology

PM0237

10/88

DocID027104 Rev 2

2402 + k * 2 MHz, where k = 0..39;

There are two channels types:

Advertising channels that use three fixed RF channels (37, 38 and 39) for:

Advertising channel packets

Packets used for discoverability/connectability

Used for broadcasting/scanning

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

2402 MHz

Advertising channel

2404 MHz

Data channel

2406 MHz

Data channel

….

Data channel

2424 MHz

Data channel

2426 MHz

Advertising channel

2428 MHz

Data channel

2430 MHz

Data channel

….

Data channel

2478 MHz

Data channel

2480 MHz

Advertising channel

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