PM0237 datasheet(11/88 Pages) STMICROELECTRONICS

Part #	PM0237

Description	The main purpose of this document is to provide a developer

PDF	88 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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11 / 88 page

DocID027104 Rev 2

11/88

PM0237

Bluetooth low energy technology

1.3

Link Layer (LL)

The link layer (LL) defines how two devices can use a radio for transmitting information

between each other.

The link layer defines a state machine with five states:

Figure 3. Link Layer state machine

•

Standby: the device does not transmit or receive packets

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Advertising: the device broadcasts advertisements in advertising channels (it is called

an advertiser device)

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Scanning: device looks for advertisers devices (it is called a scanner device).

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Initiating: the device initiates connection to advertiser device

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Connection: the initiator device is in Master Role: it communicates with the device in

the Slave role and it defines timings of transmissions

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Advertiser device is in Slave Role: it communicates with a single device in Master Role

PM0237 Datasheet(PDF) 11 Page - STMicroelectronics