BM71 BLE Connection States

Last modified by Microchip on 2023/11/09 09:04

The Bluetooth® Low Energy (BLE) link layer on the BM71 operates in a variety of states that are analogous to those described in the standard. This page provides an overview of these connection states, which will help you to understand the device datasheet electrical specifications.

BLE Connection Phases

In a BLE connection establishment, both hosts run through a sequence of basic connection phases, as shown in the diagram:

BLE Connection States

Connection PhaseOverview
Standby/IdleNo connection
DiscoverySlave (Advertiser) sends ADV packets and is discoverable
ConnectingMaster (Initiator) selects a device to connect to
ConnectedMaster/Slave exchange data packets at regular intervals

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BLE Link Layer States

These connection phases correspond to link layer states as defined in the Bluetooth standard:

BLE Link Layer States

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BM71 Link Layer States

BM71 defines its own link layer operating states that are analogous to those defined above:

BM71 Link Layer States

BM71 LL StateCorresponds ToConnection Phase
Shutdown-Lowest Power mode (BM71 is Shutdown)
IdleStandbyNo connection
StandbyAdvertisingDiscovery
ScanningScanningDiscovery
ConnectingInitiatingConnecting
ConnectedConnectedConnected

BM71 defines different labels for some of the basic BLE link layer states. This page outlines these differences and will help you better understand the electrical specifications in the device datasheet.

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