STA2416 datasheet(23/38 Pages) STMICROELECTRONICS

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STA2416

General specification

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6.7

V1.2 detailed functionality - adaptive frequency hopping

User perspective - adaptive frequency hopping

In the Bluetooth™ specification 1.1 the Bluetooth devices hop in the 2.4 GHz band over

79-channels. Since WLAN 802.11 has become popular, there are specification

improvements in the 1.2-SIG spec for Bluetooth where the Bluetooth units can avoid the

jammed bands and thereby provide an improved co-existence with WLAN.

Technical perspective - adaptive frequency hopping

Figure 5.

AFH

First the Master and/or the Slaves identify the jammed channels. The Master decides on the

channel distribution and informs the involved slaves. The Master and the Slaves, at a

predefined instant, switch to the new channel distribution scheme.

No longer jammed channels are re-inserted into the channel distribution scheme. AFH uses

the same hop frequency for transmission as for reception

6.8

V1.2 detailed functionality - faster connection

User perspective - faster connection

This feature gives the User about 65% faster connection on average when enabled

compared to Bluetooth™ specification 1.1 connection procedure.

Technical perspective - faster connection

The faster Inquiry functionality is based on a removed/shortened random back off and also a

new Interlaced Inquiry scan scheme.

The faster Page functionality is based on Interlaced Page Scan.

WLAN used frequency

AFH(79)

AFH(19<N<79)

STA2416 データシート(PDF) 23 Page - STMicroelectronics