BLUENRG-332VT datasheet(22/67 Pages) STMICROELECTRONICS

22 / 67 page

Note:

The RF_ACTIVITY signal is used to notify if there is an ongoing RF operation ( either TX or RX). It is a logical

OR between the RX_SEQUENCE and TX_SEQUENCE. This signal can be used to enable an antenna switch

component when achieving antenna switching during AoA or AoD operation.

2.26

Direction finding

The BlueNRG-LPS Bluetooth radio controller supports the angle of arrival (AoA) and angle of departure (AoD)

features by managing:

•

the constant tone extension (CTE) inside a packet

•

the antenna switching mechanism for both AoA and AoD.

The antenna switching mechanism provides a 7-bit antenna identifier ANTENNA_ID[6:0] indicating the antenna

number to be used.

In a AoD transmitter or in a AoA receiver, the radio needs to switch antenna during the CTE field of the

packet. For this purpose, the ANTENNA_ID signal can be enabled on some I/Os, by programming them in the

associated alternate function. This signal needs to be provided to an external antenna switching circuit, since

ANTENNA_ID[0] is the least significant bit and ANTENNA _ID[6] the most significant bit of the antenna identifier

to be used.

BlueNRG-LPS

Direction finding

DS13819 - Rev 4

page 22/67

BLUENRG-332VT 데이터시트(PDF) 22 Page - STMicroelectronics