AN1514: SiWG917 SoC PTA 3-Wire Co-Existence for Wi-Fi and Zigbee#

This application note describes the implementation of a Packet Traffic Arbitration (PTA) demo using EFR32MG21 devices for Zigbee® and the SiWG917 System-on-Chip (SoC) for Wi-Fi®. Both operate concurrently on overlapping frequency channels in the 2.4 GHz band while being spatially co-located. PTA coordinates 2.4 GHz RF traffic between co-located radios on the same host and wireless solutions. These techniques apply to the EFR32MGx family.

The document provides detailed guidance on implementing PTA for the SiWG917 in Wi-Fi environments. It assumes that you have a basic understanding of Wi-Fi coexistence principles and how they apply to Zigbee devices (EFR32MG21). The document focuses on the PTA-related functions and configuration options of the SiWG917 and references corresponding features on the EFR32MG21. For more information, see UG103.17: Wi-Fi® Co-Existence Fundamentals.

Key Points#

• Introduction to PTA 3-Wire Co-Existence

• 2.4 GHz channel operation co-existence with EFR32MG21 using Zigbee

• Configuration details on various modes of operation

• Pin Connections between the SiWG917 and EFR32MG21 for PTA

• PTA main application bring-up steps

• PTA test results under different test scenarios

Contents#

• Introduction

• Background

• Wi-Fi Impact on 802.15.4 Radios

• Objectives

• PTA 3-Wire Co-Ex Mechanism

• Prerequisites

• Functional Block Diagram

• Hardware Configurations

• PTA Configuration

• PTA Results and Observations

• Major Technical Specification of PTA

• Use Case Scenario

• Limitations

• Conclusions

• References