PM0237 datasheet(8/88 Pages) STMICROELECTRONICS

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Bluetooth low energy technology

PM0237

8/88

DocID027104 Rev 2

1.1

BLE stack architecture

Bluetooth low energy technology has been formally adopted by the Bluetooth Core

Specification version 4.0 (on Section 4: References). This version of the Bluetooth standard

supports two systems of wireless technology:

•

Basic rate

•

Bluetooth low energy

Bluetooth low energy technology operates in the unlicensed industrial, scientific and

medical (ISM) band at 2.4 to 2.485 GHz, which is available and unlicensed in most

countries. It uses a spread spectrum, frequency hopping, full-duplex signal. Key features of

Bluetooth low energy technology are:

•

robustness

•

performance

•

reliability

•

interoperability

•

low data rate

•

low-power

In particular, Bluetooth low energy technology has been created for the purpose of

transmitting very small packets of data at a time, while consuming significantly less power

than Basic Rate/Enhanced Data Rate/High Speed (BR/EDR/HS) devices.

The Bluetooth low energy technology is designed for addressing two alternative

implementations:

•

Smart device

•

Smart Ready device

Smart devices support only support the BLE standard. It is used for applications in which

low power consumption and coin cell battery is the key point (as sensors).

Smart Ready devices support both BR/EDR/HS and BLE standards (typically a mobile or a

laptop device).

The Bluetooth low energy stack consists of two components:

•

Controller

•

Host

The Controller includes the Physical Layer and the Link Layer.

The Host includes the Logical Link Control and Adaptation Protocol (L2CAP), the Security

Manager (SM), the Attribute protocol (ATT), Generic Attribute Profile (GATT) and the

Generic Access Profile (GAP). The interface between the two components is called Host

Controller Interface (HCI).

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