ACC-005

ACC-005 Datasheet

Part Number ACC-005

Part	Datasheet
ACC-005	ACC-005 (pdf)

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Bluetooth Audio Development Pack Winbond W681360 Codec Board User Guide Part Number ACC-005 The information contained in this document is subject to change without notice. EZURiO Ltd makes no warranty of any kind with regard to this material including, but not limited to, the implied warranties of merchant ability and fitness for a particular purpose. EZURiO Ltd shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. Copyright 2006 EZURiO Limited. All rights reserved. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of EZURiO. Other product or company names used in this publication are for identification purposes only and may be trademarks of their respective owners. APN_06002_1v03 Winbond Audio Board Application Note Development Kit Winbond Audio Codec Board Part Number ACC-005 The EZURiO Winbond Codec Evaluation Board plugs into the EZURiO Developers kit and allows you to rapidly test and evaluate Bluetooth audio applications using the EZURiO Bluetooth Intelligent Serial Module to implement the wireless link. The ACC-005 evaluation board is based on the Winbond W681360 codec - a 3V, single channel, 13 bit linear voice-band codec, which is pin compatible to the Motorola MC145483. The codec is used to digitise incoming audio from the microphone into PCM data and convert the PCM digital audio output of the Bluetooth chip into an analogue signal for the headphones. The codec board has a microphone input and headphone output which are compatible with standard PC headsets. The W681630 codec has several features such as power down mode and high pass filter disable to allow frequencies down to DC to be used . The ACC-005 codec evaluation board provides options to allow these features to be tested. The W681360 incorporates a feature that allows the volume of the codec output to be digitally controlled via 3 bits of the PCM data stream. The BISM II provides an AT command ATS589 that allows you to control the volume of the codec. This document provides you with information to prototype and evaluate your own audio application. Once you have tried out your application, you will be able to design your own audio solution based around the Winbond codec and the EZURiO Bluetooth Intelligent Serial module. Bluetooth is a trademark owned by Bluetooth SIG, Inc., USA and licensed to EZURIO Ltd. APN_06002_1v03 Winbond Audio Board Application Note Overview The codec board is powered by an on-board 3.3V regulator to reduce noise to a minimum. The PCM control signals for the codec go directly to the Bluetooth module on the motherboard via the 10-way connector, as do the 3 push button switches. This allows the switches to be used with an external program that implements the upper portion of headset or Handsfree profile. The microphone input, designed to interface to PC compatible headsets, has a fixed gain of 16 set by external components to the codec the amplifier itself is part of the codec . Part of the microphone signal is mixed into the headphone output signal via VR2. This feature is known as “sidetone” and allows the user to hear their own voice when speaking. It is commonly used in telephony applications to give the user the necessary audio feedback that their ears expect. The audio output gain is by default fixed at By fitting VR1, the audio gain can be made adjustable. The 120mW stereo output amplifier U3 ensures that the codec board can drive standard stereo headphones while keeping total harmonic distortion down to Component Placement Note that not all components are fitted non-fitted components are shown without pads. Refer to Section 7 for details of component fitment and specification. APN_06002_1v03 Winbond Audio Board Application Note Codec Board Quick Start Guide Getting Started The codec board is supplied with a right angle, 10 way connector that can be used to connect it to the main developers kit. If required, this should be soldered to the main board. Alternatively other connectors or ribbon cables can be used. Equipment Required not supplied • Headsets with microphone Standard PC headsets are fine • EZURiO Wireless Developers Kit • BISM II Bluetooth module Firmware release V9_20_22 onwards supports audio volume control Normally two sets of development kit are required to test both ends of an audio link. If an application is being developed with an existing endpoint, such as a mobile phone or headset, only one set may be needed. Motherboard Jumper Settings Before using the codec board, there is a jumper setting on the motherboard that needs to be checked. This is CB1, next to the USB adaptor, which must be removed. If fitted it will short out the PCM output from the codec and prevent it operating. CB1 is only relevant for the WLAN data module. REMOVE Procedure: 1 Plug the BISM II into the socket on the Dev Kit, connect to a PC serial port and power up. See the dev kit manual for different power supply options. 2 Check that AT commands are working using EZURiO terminal. Refer to blu2i Quick Start Guide if needed 3 Run the “ATI3” command to find out the firmware release number. If it is less than V9_20_22, contact EZURiO to get a firmware upgrade for the BISM II. Note older versions of firmware will work, but audio output will be at half the full volume and the ats589=7 command will not be recognised 4 Power down, plug the codec board into the dev kit and power up. Check that AT commands are working. APN_06002_1v03 Winbond Audio Board Application Note

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Bluetooth Audio Development Pack Winbond W681360 Codec Board User Guide

Part Number ACC-005

The information contained in this document is subject to change without notice. EZURiO Ltd makes no warranty of any kind with regard to this material including, but not limited to, the implied warranties of merchant ability and fitness for a particular purpose. EZURiO Ltd shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.

Copyright 2006 EZURiO Limited. All rights reserved.

No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of EZURiO.

Other product or company names used in this publication are for identification purposes only and may be trademarks of their respective owners.

APN_06002_1v03 Winbond Audio Board Application Note

Development Kit

Winbond Audio Codec Board

Part Number ACC-005

The EZURiO Winbond Codec Evaluation Board plugs into the EZURiO Developers kit and allows you to rapidly test and evaluate Bluetooth audio applications using the EZURiO Bluetooth Intelligent Serial Module to implement the wireless link.

The ACC-005 evaluation board is based on the Winbond W681360 codec - a 3V, single channel, 13 bit linear voice-band codec, which is pin compatible to the Motorola MC145483. The codec is used to digitise incoming audio from the microphone into PCM data and convert the PCM digital audio output of the Bluetooth chip into an analogue signal for the headphones. The codec board has a microphone input and headphone output which are compatible with standard PC headsets.

The W681630 codec has several features such as power down mode and high pass filter disable to allow frequencies down to DC to be used . The ACC-005 codec evaluation board provides options to allow these features to be tested.

The W681360 incorporates a feature that allows the volume of the codec output to be digitally controlled via 3 bits of the PCM data stream. The BISM II provides an AT command ATS589 that allows you to control the volume of the codec.

This document provides you with information to prototype and evaluate your own audio application. Once you have tried out your application, you will be able to design your own audio solution based around the Winbond codec and the EZURiO Bluetooth Intelligent Serial module.

Bluetooth is a trademark owned by Bluetooth SIG, Inc., USA and licensed to EZURIO Ltd.

APN_06002_1v03 Winbond Audio Board Application Note

Overview

The codec board is powered by an on-board 3.3V regulator to reduce noise to a minimum. The PCM control signals for the codec go directly to the Bluetooth module on the motherboard via the 10-way connector, as do the 3 push button switches. This allows the switches to be used with an external program that implements the upper portion of headset or Handsfree profile.

The microphone input, designed to interface to PC compatible headsets, has a fixed gain of 16 set by external components to the codec the amplifier itself is part of the codec . Part of the microphone signal is mixed into the headphone output signal via VR2. This feature is known as “sidetone” and allows the user to hear their own voice when speaking. It is commonly used in telephony applications to give the user the necessary audio feedback that their ears expect.

The audio output gain is by default fixed at By fitting VR1, the audio gain can be made adjustable.

The 120mW stereo output amplifier U3 ensures that the codec board can drive standard stereo headphones while keeping total harmonic distortion down to

Component Placement

Note that not all components are fitted non-fitted components are shown without pads. Refer to Section 7 for details of component fitment and specification.

APN_06002_1v03 Winbond Audio Board Application Note

Codec Board Quick Start Guide

Getting Started

The codec board is supplied with a right angle, 10 way connector that can be used to connect it to the main developers kit. If required, this should be soldered to the main board. Alternatively other connectors or ribbon cables can be used.

Equipment Required not supplied
• Headsets with microphone Standard PC headsets are fine
• EZURiO Wireless Developers Kit
• BISM II Bluetooth module Firmware release V9_20_22 onwards supports audio volume
control

Normally two sets of development kit are required to test both ends of an audio link. If an application is being developed with an existing endpoint, such as a mobile phone or headset, only one set may be needed.

Motherboard Jumper Settings

Before using the codec board, there is a jumper setting on the motherboard that needs to be checked. This is CB1, next to the USB adaptor, which must be removed. If fitted it will short out the PCM output from the codec and prevent it operating. CB1 is only relevant for the WLAN data module.

REMOVE

Procedure:
1 Plug the BISM II into the socket on the Dev Kit, connect to a PC serial port and power up. See the dev kit manual for different power supply options.
2 Check that AT commands are working using EZURiO terminal. Refer to blu2i Quick Start Guide if needed
3 Run the “ATI3” command to find out the firmware release number. If it is less than V9_20_22, contact EZURiO to get a firmware upgrade for the BISM II. Note older versions of firmware will work, but audio output will be at half the full volume and the ats589=7 command will not be recognised
4 Power down, plug the codec board into the dev kit and power up. Check that AT commands are working.

APN_06002_1v03 Winbond Audio Board Application Note

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived ACC-005 Datasheet file may be downloaded here without warranties.

Datasheet ID: ACC-005 645084