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AN3857

Social Distancing with UHF and UWB Devices Application

Note

Introduction

This application note describes a Social Distancing (SD) application to measure and track distances between SD

devices (up to five) using Microchip's UHF and UWB technologies. These technologies offer low-power solutions for

longer battery life. The purpose of this application is to raise an alarm if the distance falls below a threshold value for

a predefined time.

Features

• ATA8510 UHF Transceiver for Communication to Other Devices at 433 MHz or 868 MHz

• ATA8350 Ultra-Wide-Band (UWB) Transceiver for Distance Measurement at 7 GHz

• AIS2DW12 Motion Sensor for Movement Detection

• ATtiny3217 Host MCU for Application Control

• Supports Tracking Up to Four Other Devices within 3m x 3m Area

• Generates an Alarm by LED Flashing and Buzzer when the Distance Between Two Devices is Less than 1.5m

or 2m for More than 5 Seconds

• Optional Saving of Contact IDs in Serial Flash Device (SST25PF040C)

• Operates with a LIR2540 or CR2540 Coin Cell Battery for More than a Week

• Optional USB Li-Ion Charger (MIC79110) for Li-Ion or Li-Po Accumulator with 3V Regulator (MIC5306) instead

of Coin Cell

MICROCHIP CONFIDENTIAL

FOR RELEASE ONLY UNDER NON-DISCLOSURE

AGREEMENT (NDA)

Table of Contents

Introduction.....................................................................................................................................................1

Features......................................................................................................................................................... 1

1. Quick References....................................................................................................................................3

1.1. Reference Documentation............................................................................................................3

1.2. Hardware Prerequisites................................................................................................................3

1.3. Acronyms/Abbreviations...............................................................................................................3

2. Overview................................................................................................................................................. 4

2.1. General Flow................................................................................................................................5

2.2. Application Flow........................................................................................................................... 5

3. Social Distancing States......................................................................................................................... 7

3.1. Unconnected State.......................................................................................................................7

3.2. Connected State...........................................................................................................................9

3.3. Search State...............................................................................................................................11

3.4. Alarm State.................................................................................................................................12

4. RF Parameters......................................................................................................................................13

5. Prototype and Demo Kit for Social Distancing ..................................................................................... 14

6. Prototype Implementation..................................................................................................................... 15

6.1. Data Processing.........................................................................................................................15

6.2. UHF Polling Configuration .........................................................................................................15

6.3. Fast ADV_RX Mode...................................................................................................................15

6.4. Status Output ............................................................................................................................ 15

6.5. Exception Handling and Debug Output...................................................................................... 16

7. Prototype Measurement Example.........................................................................................................17

8. Document Revision History...................................................................................................................19

The Microchip Website.................................................................................................................................20

Product Change Notification Service............................................................................................................20

Customer Support........................................................................................................................................ 20

Microchip Devices Code Protection Feature................................................................................................ 20

Legal Notice................................................................................................................................................. 21

Trademarks.................................................................................................................................................. 21

Quality Management System....................................................................................................................... 22

Worldwide Sales and Service.......................................................................................................................23

AN3857