Microchip Technology BM20 User manual

Preliminary Edition

2015 Microchip Technology Inc.

page 1

BM20 Bluetooth®

Evaluation Board User’s Guide

BM20 BLUETOOTH

EVALUTATION BOARD USER’S GUIDE

Preliminary Edition

2015 Microchip Technology Inc.

page 2

Index

Preface........................................................................................................................................4

1 OVERVIEW ..............................................................................................................................6

1.1 INTRODUCTION................................................................................................................................................6

1.2 BM20 EVALUATION BOARD FEATURES ........................................................................................................6

1.3 BM20 EVALUATION BOARD CONTENTS........................................................................................................7

2. Getting Started.....................................................................................................................10

2.1 INTRODUCTION..............................................................................................................................................10

2.2 HARDWARE REQUIREMENTS ......................................................................................................................10

2.3 APPLICATION DEMONSTRATION .................................................................................................................10

2.4 SOFTWARE/UTILITY REQUIREMENTS ........................................................................................................13

2.5 MODULE CONFIGURATION...........................................................................................................................25

APPENDIX A. BM20 AUDIO EVALUATION BOARD SCHEMATICS....................................... 26

APPENDIX B. CLASS D AMPLIFIER DAUGHTER BOARD....................................................32

BM20 BLUETOOTH

EVALUTATION BOARD USER’S GUIDE

Preliminary Edition

2015 Microchip Technology Inc.

page 3

TO OUR VALUED CUSTOMERS

It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip

products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and

enhanced as new volumes and updates are introduced.

If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via

E-mail at docerrors@microchip.com. We welcome your feedback.

Most Current Data Sheet

To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:

http://www.microchip.com

You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.

The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).

Errata

An errata sheet, describingminor operational differences from the data sheet and recommended workarounds,may exist for current

devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the revision

of silicon and revision of document to which it applies.

To determine if an errata sheet exists for a particular device, please check with one of the following:

•

Microchip’sWorldwideWeb site; http://www.microchip.com

•

Your local Microchip sales office (see last page)

When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are

using.

Customer Notification System

Abbreviations List:

HFP: Hands-free Profile

AVRCP: Audio Video Remote Control Profile

A2DP: Advanced Audio Distribution Profile

HSP: Headset Profile

NFC: Near Field Communication

BM20 BLUETOOTH

EVALUTATION BOARD USER’S GUIDE

Preliminary Edition

2015 Microchip Technology Inc.

page 4

Preface

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools

and documentation are constantly evolving to meet customer needs, so some actual

dialogs and/or tool descriptions may differ from those in this document. Please refer to

our web site

(www.microchip.com) to obtain the latest documentation available.

INTRODUCTION

This chapter contains general information that will be useful to know before using the

Product Name. Items discussed in this chapter include:

Document Layout

Recommended Reading

The Microchip Web Site

Customer Support

Document Revision History

DOCUMENT LAYOUT

This user’s guide describes how to use the BM20 Bluetooth Evaluation Board. The document is organized as

follows:

Chapter 1. “Overview” –This chapter introduces the BM20 Bluetooth Evaluation Board and provides an

overview of various features.

Chapter 2. “Getting Started” –This chapter describes

The hardware components and setup of the BM20 Bluetooth Evaluation Board.

The application demonstrations of the BM20 Bluetooth Evaluation Board.

Software/Utility Requirements of the BM20 Bluetooth Evaluation Board.

Appendix A. “BM20 Audio Evaluation Board Schematics” –This appendix includes a schematic of the

BM20 Bluetooth Evaluation Board.

RECOMMENDED READING

This user’s guide describes how to use the BM20 Bluetooth Evaluation Board. Other useful documents are

listed below. The following Microchip documents are available and recommended as supplemental reference

resources:

STEREO Module Data Sheet (DSxxxxxxxx)

THE MICROCHIP WEB SITE

Microchip provides online support via our web site at http://www.microchip.com. This

web site is used as a means to make files and information easily available to

customers. Accessible by using your favorite Internet browser, the web site contains

BM20 BLUETOOTH

EVALUTATION BOARD USER’S GUIDE

Preliminary Edition

2015 Microchip Technology Inc.

page 5

the following information:

Product Support –Data sheets and errata, application notes and sample programs, design resources,

user’s guides and hardware support documents, latest software releases and archived software

General Technical Support –Frequently Asked Questions (FAQs), technical support requests, online

discussion groups, Microchip consultant programmember listing

Business of Microchip –Product selector and ordering guides, latest Microchip press releases, listing of

seminars and events, listings of Microchip sales offices, distributors and factory representatives

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

Distributor or Representative

Local Sales Office

Field Application Engineer (FAE)

Technical Support

Customers should contact their distributor, representative or Field Application Engineer

(FAE) for support. Local sales offices are also available to help customers. A listing of

sales offices and locations is included in the back of this document.

Technical support is available through the web site at: http://support.microchip.com

DOCUMENT REVISION HISTORY

Revision A (Aug 2015)

This is the initial released version of this document.

BM20 BLUETOOTH

EVALUTATION BOARD USER’S GUIDE

Preliminary Edition

2015 Microchip Technology Inc.

page 6

1 OVERVIEW

1.1 INTRODUCTION

This user’s guide describes the hardware and software setup for the BM20 Bluetooth®Evaluation Board.

This board contains the hardware needed to evaluate the BM20 Bluetooth module. The BM20 module is

mounted to an evaluation board that demonstrates the module’s key features. The evaluation board contains:

Stereo audio output

Easy access to IO pins

6 push buttons to control audio playback

Status LEDs

The BM20 supports the following Bluetooth profiles: A2DP, AVRCP, and HFP/HSP

A2DP stereo audio (Sink mode wi support for Sub-Band Coding (SBC),

AVRCP media player remote control

HFP/HSP for accepting a phone call support.

For data sheet and other details related to BM20 module, refer to the Microchip web

site at http://www.microchip.com.

This chapter discusses the following topics:

BM20 Evaluation Board Features

BM20 Evaluation Board Contents and Part Details

1.2 BM20 EVALUATION BOARD FEATURES

The BM20 Evaluation Board has the following features:

Fully qualified Bluetooth version 4.1 module, fully compatible with Bluetooth version 3.0, 2.0, 1.2

system.

Embedded BM20 module with postage-stamp size form factor of 15 x 29 x 2.5 mm (include shielding

case)

Embedded Bluetooth stack profiles: A2DP, AVRCP, and HFP/HSP

Stereo audio output for highest quality audio

Castellated SMT pads for easy and reliable PCB mounting

Environmentally friendly, RoHS compliant

Bluetooth SIG certified

On board external CDA for speaker demonstration.

BM20 BLUETOOTH

EVALUTATION BOARD USER’S GUIDE

Preliminary Edition

2015 Microchip Technology Inc.

page 7

1.3 BM20 EVALUATION BOARD CONTENTS

BM20 Evaluation Board contains the following components as shown in Figure 1-1 which describes the

evaluation board’s interfaces and connectors. Table 1-1 describes the various components of the evaluation

board.

FIGURE 1-1: BM20 EVALUATION BOARD

Audio Output (JP23) MIC (JP22) NFC tag connector (JP3)

Description

AOHPL

MIC_P1

NFC_P

AOHPM

AGND

NFC_N

AOHPR

MIC_N1

1 2 3

1 2

BM20 BLUETOOTH

EVALUTATION BOARD USER’S GUIDE

Preliminary Edition

2015 Microchip Technology Inc.

page 8

IO Connector (J1) On Board External CDA Interface (J2)

Description

P0_0

P2_4

External AMP enable

control(P1_5)

P3_0

P0_2

P2_0

P0_3

R channel signal to external

AMP.

P1_5

P0_5

P0_4

P2_7

L channel signal to external

AMP.

P0_1

P2_4

5V power for external AMP

from USB.

External AMP Connector (JP26) Battery connector (JP20) and Jack (JP19)

(Alternative for BAT_IN)

Description

EXT_AMP_EN

BAT_IN

SPKR

GND

AGND

SPKL

AMP_POWER

1 2 3 4 5

2 1

BM20 BLUETOOTH

EVALUTATION BOARD USER’S GUIDE

Preliminary Edition

2015 Microchip Technology Inc.

page 9

TABLE 1-1:BM20 EVALUATION BOARD HARDWARE

Hardware Component

Description

BM20

Bluetooth®4.1 Module

USB Connector

DC 5V input, USB to UART for EEPROM R/W

BAT connector & Jack

JP20 and JP19 , alternative for BAT_IN

Audio Out

Audio 3.5 mm jack for audio playback(P6).

External AMP daughter board connector (JP26).

On Board external CDA output connector (J3/4).

Audio In

Audio 3.5 mm jack for Mono microphone input(P5) and AUX input(P7)

Status LEDs

Red and Blue LEDs show the pairing/connection status

MFB Button

Switch to turn on/off BM20 module (SW7; Button 0 in UI)

Play/Pause Button

Button to play or pause the audio playback (SW8; Button1 in UI)

Previous Track Button

Button to skip track backwards (SW4; Button 5 in UI)

Next Track Button

Button to skip track forwards(SW5; Button 4 in UI)

Volume Up Button

Button to increase volume (SW9; Button 2 in UI)

Volume Down Button

Button to decrease volume (SW10; Button 3 in UI)

Reset Button

Reset system (SW11)

NFC Tag Connector

NFC Tag connector.(For NFC tag without Rectifier Circuit)(JP3)

MP Tool Interface

Interfaces connect to VICTORIA board when use MP Tool

BM20 BLUETOOTH

EVALUTATION BOARD USER’S GUIDE

Preliminary Edition

2015 Microchip Technology Inc.

page 10

2. Getting Started

2.1 INTRODUCTION

This chapter describes how the BM20 Evaluation Board works. Certain hardware and utilities are essential to

support the evaluation/development of demo applications. This chapter discusses the following topics:

Hardware Requirements

Software/Utility Requirements

Module Configuration

2.2 HARDWARE REQUIREMENTS

2.2.1 HARDWARE SETUP

To setup the evaluation hardware, perform the following steps:

1. Make sure pin 1 / 2 / 3 of “SW12”in “Off / Off / On”state make .system in application mode.

2. Connect the portable mini-speaker 3.5 mm to the stereo audio out connector (P6).

2.2.2 USING THE EVALUATION BOARD

1. Connect Li-Ion batteries to JP20 or JP19.

2. Click MFB button to turn-on and enter pairing mode. The status LEDs will blink. Now the BM20 Evaluation

board should be discoverable.

3. Turn on Bluetooth device manager on a host device (PC or smartphone), the host device will display a list

of discoverable Bluetooth devices. The board display as “EDDY SHS”.

4. If the pairing with the device is successful, BM20 evaluation board can connect to the host device. Once

connected, BM20 evaluation board enables Advanced Audio Distribution Profile (A2DP) for audio

playback and Audio Video Remote Control Profile (AVRCP) for player control.

2.3 APPLICATION DEMONSTRATION

2.3.1 AUDIO DEMONSTRATION

In this demonstration, user can play an audio stream on both BM20 evaluation boards using a computer or

smartphone. The following are the steps to perform the demonstration.

1. Connect BM20 evaluation board to a host device (PC or smartphone) that has an audio source.

2. Connect headphones (or mini-speakers) to BM20 evaluation board P6.

3. Open the audio source on the host device. Microchip recommends using media player.(e.g. Microsoft

Media Player, iTunes, and Android).

4. Start the audio stream on the media player.

When BM20 evaluation board is connected to an audio source compatible with Bluetooth AVRCP, the audio

control buttons are use to:

Control the volume of audio output.

Go to the previous track.

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