Microchip Technology Parrot User Manual

Parrot Hardware

Parrot (Voice Recorder) with ATtiny817 Hardware User's

Guide

Introduction

This user guide describes an audio demo board based on the ATtiny817, a high-performance tinyAVR® 8bit microcontroller.

The Parrot field engagement board can be used as a voice recorder to record, play back, browse, and erase voice data. This application helps the user to quickly evaluate the ADC and DAC features of the microcontroller.

The firmware and accompanying application note ( AVR42777) is available on Atmel START http://

start.atmel.com/.

Features

• Voice Record and Playback

• Electret Microphone

• Volume Control

• 8Mb SPI Data Flash

• Single-Wire Programming via UPDI

User Guide

DS40001916A-page 1

Parrot Hardware

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

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

1. Block Diagram........................................................................................................... 3

2. Hardware Details....................................................................................................... 4

2.1. Microphone...................................................................................................................................4

2.2. Filter for ADC................................................................................................................................4

2.3. Microcontroller..............................................................................................................................5

2.3.1. ADC............................................................................................................................... 6

2.3.2. DAC............................................................................................................................... 6

2.4. Filter for DAC................................................................................................................................7

2.5. Power Amplifier............................................................................................................................ 8

2.6. User Interfaces............................................................................................................................. 9

2.6.1. Buttons...........................................................................................................................9

2.6.2. LEDs..............................................................................................................................9

2.7. External Data Flash....................................................................................................................10

2.8. UPDI Programming Interface..................................................................................................... 10

3. Firmware Programming........................................................................................... 12

3.1. Connection................................................................................................................................. 12

3.2. Firmware.................................................................................................................................... 12

3.3. Programming..............................................................................................................................12

4. Revision History.......................................................................................................14

5. Object of Declaration............................................................................................... 15

The Microchip Web Site................................................................................................ 16

Customer Change Notification Service..........................................................................16

Customer Support......................................................................................................... 16

Microchip Devices Code Protection Feature................................................................. 16

Legal Notice...................................................................................................................17

Trademarks................................................................................................................... 17

Quality Management System Certified by DNV.............................................................18

Worldwide Sales and Service........................................................................................19

User Guide

DS40001916A-page 2

1. Block Diagram

ATtiny817

DACADC

SPI

Data Flash

AMP

Filter

Power

AMP

REC PLAY/STOP BACK FORWARD

GPIO x6

PWR REC

GPIO x2

3.3V

Volume Control

ERASE

LDO

3.3V

User

The Parrot field engagement board demonstrates the capabilities of the ATtiny817 with audio processing, using its ADC and DAC peripherals. It is possible to record, playback, erase, rewind, and fast forward by using the buttons.

Parrot Hardware

As shown in the figure above, once the “REC” (record) button is pressed, the electret microphone starts to detect an analog sound signal. The sound signal will be processed in the front-end operation amplifier and a low-pass filter will be applied to the signal. The signal will then be digitized by the ADC of the ATtiny817 microcontroller. The converted sound data is stored in the external data Flash through the SPI interface. When the button is pressed again, this recording process is stopped.

Once the “PLAY/STOP” button is pressed, the sound data stored in the data Flash is read and converted to an analog signal through the DAC on the MCU. The analog signal is then sent through a low-pass filter before it is sent to the amplifier with the set volume. This allows the user to listen to the previously recorded sound. If the button is pressed again, the play process is stopped.

The board is supplied with +5V from the Micro-USB interface with ESD protection. The applied LDO can source out 150mA @ 3.3V system power.

Figure 1-1. Parrot Board

User Guide

DS40001916A-page 3

2. Hardware Details

1uF

C19

10k

R21

VCC_P3V3

SGND

TP5

BL-MP6022P-2C-44DB

GND

Microphone

MIC1

SGND

3.3nF

C20

SGND

C17

4.7uF

100k

R18

100nF

C15

R19

SGND

39k

R20

24k

R26

VCC_P3V3

ADC_VF_HALF

18k

R40

1uF

C18

2.1 Microphone

The device is a general low-cost electret microphone. See the table below for technical parameters.

It is highly recommended to keep the microphone at least 10cm away from the sound source to avoid peak clipping or distortion of the signal.

Table 2-1. Microphone Parameters

Parameters Value

Manufacturer part number BL-MP6022P-2C-44DB

Standard operation voltage (DC) 2V

Active current <0.5mA

Sensitivity (1kHz, 0dB=1V/Pa) -44dB ±3dB

S/N ratio 58dB

Parrot Hardware

2.2 Filter for ADC

As shown in the figure below, the power for the microphone is VCC_P3V3, which is filtered by a low-pass filter to reduce noise from the power supply.

Typically, the original voice signal is quite weak, with measured amplitude around 10mV (less than 50mV). So the signal must be amplified and filtered accordingly. To make sure that the signal can be amplified without being distorted, a voltage offset is required.

Figure 2-1. Microphone Circuit

Impedance < 2.2kΩ

Frequency (Hz) 20-16,000

Directivity Omnidirectional

As shown in the figure below, the original signal is processed in a 4-order Sallen-Key Butterworth lowpass filter. The filter is designed to have a gain of 50 and a cut-off frequency of 4kHz. The amplified signal is connected to the MCU ADC input 11 (pin PB0_AIN11).

User Guide

DS40001916A-page 4

Mic. with P re-Amp lification an d filter

TP6

U5B MCP6002-I/SN

10nF

C39

5.6k

R39

1.5nF

C24

100nF

C22

GND

VCC_P3V3

15k

R42

PB0_AIN11

U5A MCP6002-I/SN

SGND

VCC_P3V3

15k

R24

2.4k

R25

SGND

GND

1uF

C23

R44

10nF

C21

2.2nF

C16

11k

R23

6.8k

R22

SGNDSGND

2.4k

R43

1uF

C40

SGND GND

18k

R40

R41

Parrot Hardware

Figure 2-2. Amplifier and Filter Circuit

The real filter response vs. frequency curve based on measured data is shown in the figure below.

Figure 2-3. Gain vs. Frequency Curve for the Low-pass Filter of the MIC

2.3 Microcontroller

The ATtiny817 is a tinyAVR 8-bit microcontroller with up to 8KB Flash, 512 bytes of SRAM, and 128 bytes of EEPROM in a 14-, 20-, and 24-pin package.

The microcontroller uses the latest technologies from Microchip Technology Inc. with a flexible and lowpower architecture including Event System and SleepWalking, accurate analog features, and advanced peripherals.

User Guide

DS40001916A-page 5

2.3.1 ADC

The Analog-to-Digital Convert (ADC) peripheral features a 10-bit successive approximation ADC with capability of a sampling rate of up to 150ksps. The ADC is connected to a 12-channel Analog Multiplexer, which allows twelve single-ended voltage inputs. The single-ended voltage inputs refer to 0V (GND).

For more detail, refer to the latest data sheet of ATtiny817 available at http://www.microchip.com/

wwwproducts/en/attiny817.

Figure 2-4. ATtiny817 ADC Block Diagram

MUXPOS

CTRLA

EVCTRL

COMMAND

Start Conversion

Parrot Hardware

WINLT

WINHT

AIN0

AIN1

AIN11

DAC

VREF

TEMP

2.3.2 DAC

The Digital-to-Analog Converter (DAC) converts a digital value to a voltage. ATtiny817 features an 8-bit Resistor String type DAC, capable of converting 350,000 samples per second (350ksps), with the internal Voltage Reference (VREF) as upper limit for conversion. The DAC has one continuous time output with high drive capabilities, which is able to drive a 5kΩ or 50pF load. The DAC has one analog output pin (DACOUT), namely the PA06, that must be configured before it can be used.

...

Internal ref

VDD

ADC

VREF

Reference sel.

Enable, Resolution

CTRLC

prescaler

CTRLB

Number of Accumulated Samples

RES

accumulate

Threshold (IRQ)

Result Ready (IRQ)

User Guide

DS40001916A-page 6

Figure 2-5. ATtiny817 DAC Block Diagram

DAC

DATA

Output Driver

CTRLA

ENABLE

OUTEN

VREF

peripherals

other

OUT

TP4

U3A MCP6002-I/SN

U3B MCP6002-I/SN

U2A MCP6002-I/SN

U2B MCP6002-I/SN

PA6_DACOUT

1uF

150kR5100k

150k

470pF

SGND

220pF

GND

VCC_P3V3

330kR7180k

330k

270pF

SGND

100pF

330kR9300k

R10

330k

330pF

C10

SGND

47p

330k

R11

270k

R12

330k

1nF

C11

SGND

18pF

GND

VCC_P3V3

1uF

OP AMP Filter

100nF

C12

GND

VCC_P3V3

100nF

C13

GND

VCC_P3V3

SGND

39k

R16

24k

R17

VCC_P3V3

100nF

C14

DAC_VF_HALF

2.4 Filter for DAC

This filter is an 8-order Butterworth low-pass filter with 1V/V gain. The cut-off frequency is designed to be 4kHz with 0.5dB allowable pass band ripple.

Figure 2-6. 8-order Low-pass Chebyshev Filter

Parrot Hardware

As shown in the figure below, the curve is based on measured data of the filter on the board.

User Guide

DS40001916A-page 7

Figure 2-7. Gain vs. Frequency Curve for the 8-order Low-pass Filter

MCP6002-I/SN

1uF

TP3

GND

10R

R14

47nF

110k

R13

VCC_VBUS_P5V0

TP1

TP2

BTL AM P for Spea ker

SGND

8 ohm, 2W

Speaker 2831

SP1

U1 LM386M-1

U4 LM386M-1

GND

VCC_VBUS_P5V0

WH0141-1(14*1) B10K

1 3

VR1

POT_METER_3P S2B-PH-K-S

1 2

HEADER-2

100k

R15

SGND

C38

4.7uF

VCC_VBUS_P5V0

GND

SGND

Parrot Hardware

2.5 Power Amplifier

Figure 2-8. Power Amplifier for the Speaker

As shown in the figure above, the LM386M-1 amplifier device is powered by USB +5V. The gain from the power amplifier circuit is fixed to 20 V/V. The input of this circuit is the analog output of the 8-order low power filter for the DAC.

In front of the power amplifier, one variable resistor (VR1) and a couple of relative resistors construct a simple circuit for the users to adjust the loudspeaker volume.

User Guide

DS40001916A-page 8

2.6 User Interfaces

4 2

SKRAAKE010

SW1

GND

100k

R28

User Bu tton

PC5_USER_BTN

100nF

C30

VCC_P3V3

TP8

1 3

SKRAAKE010

SW2

100nF

C33

GND

REC .

R34 1k

1 3

SKRAAKE010

SW3

100nF

C34

GND

PLAY/ST OP

R35 1k

1 3

SKRAAKE010

SW4

100nF

C35

GND

BACK

R36 1k

1 3

SKRAAKE010

SW5

100nF

C36

GND

FOR WARD

R37 1k

TP17 TP18 TP19 TP20

PB5

PB6

PB7

PA7

1 3

SKRAAKE010

SW6

100nF

C37

GND

ERASE

R38 1k

TP21

PB4

This button is reserved for user.

2.6.1 Buttons

There are six functional buttons on the board:

• “REC” button, to start or stop the microphone recording

• “PLAY/STOP” button, to playback the recorded sound

• “BACK” button, to jump to previous sound data

• “FORWARD” button, to jump to forward sound data

• “ERASE” button, to erase sound data

• “USER” button, reserved for users

Figure 2-9. Buttons

Parrot Hardware

Table 2-2. Pin Map for the Buttons

Button Name I/O Pin

PLAY/STOP PB5

FORWARD PB7

2.6.2 LEDs

There are two LEDs on the board, as shown in the figure below. The firmware determines the use of the LEDs.

Figure 2-10. Status LEDs

REC PB4

BACK PB6

ERASE PA7

USER PC5

User Guide

DS40001916A-page 9

Table 2-3. Pin Map for the LEDs

Recommended LEDs name ATtiny817 I/O pin Color

Power LED PB3 Green

Record LED PB2 Red

2.7 External Data Flash

This data Flash from Microchip is an 8Mb SPI serial Flash. It supports single voltage read and write operations under 2.7-3.6V power supply.

Figure 2-11. External Data Flash

Parrot Hardware

Table 2-4. Pinout for the SPI Interface

SPI Signal Name MCU SPI Pin Data Flash Pin

SCK PA3 pin #6

SS PA4 pin #1

MISO PA2 pin #2

MOSI PA1 pin #5

2.8 UPDI Programming Interface

The ATtiny817 supports UPDI (Unified Program and Debug Interface), which is a Microchip proprietary interface for external programming and on-chip debugging of a device.

Atmel-ICE supports the UPDI interface. The 2x3 connector for the interface is a 2.54mm pitch throughhole header.

User Guide

DS40001916A-page 10

Figure 2-12. UPDI Interface

GND

1 2 3 4 5 6

GND

VCC

MOSI

MISO SCK RESET

J11

UPDI Header

PA0_UPDI_DATA

VCC_P3V3

TP7

UPDI header connect to Atmel-ICE.

Table 2-5. Pin Map for ATtiny817 UPDI Interface

Signal Name Pin Number in the Header Pin Number in the MCU

PA0_UPDI_DATA 1 23

VCC 2 4

GND 6 3

Parrot Hardware

User Guide

DS40001916A-page 11

3. Firmware Programming

3.1 Connection

The UPDI Interface is dedicated for the code debugging or reprogramming for the ATtiny817 device. Atmel-ICE supports this operation.

Figure 3-1. Connection for the Reprogramming

Parrot Hardware

3.2 Firmware

The latest firmware is available through Atmel START: http://start.atmel.com/

Search AVR42777 Parrotʼ in the Examples browser. The project user guide instructions outline how to download the .atzip package and import the project into Atmel Studio 7.0.

3.3 Programming

Atmel Studio can be used to program the device. Go to Tools → Device Programming → Memories.

User Guide

DS40001916A-page 12

Figure 3-2. Programming Interface in Atmel Studio

Parrot Hardware

User Guide

DS40001916A-page 13

4. Revision History

Doc. Rev. Date Comments

A 07/2017 Initial document release.

Parrot Hardware

User Guide

DS40001916A-page 14

5. Object of Declaration

EU Declaration of Conformity for Parrot Field Engagement Board

This declaration of conformity is issued by the manufacturer.

The development/evaluation tool is designed to be used for research and development in a laboratory environment. This development/evaluation tool is not a Finished Appliance, nor is it intended for incorporation into Finished Appliances that are made commercially available as single functional units to end users under EU EMC Directive 2004/108/EC and as supported by the European Commission's Guide for the EMC Directive 2004/108/EC (8th February 2010).

This development/evaluation tool complies with EU RoHS2 Directive 2011/65/EU.

This development/evaluation tool, when incorporating wireless and radio-telecom functionality, is in compliance with the essential requirement and other relevant provisions of the R&TTE Directive 1999/5/EC and the FCC rules as stated in the declaration of conformity provided in the module datasheet and the module product page available at www.microchip.com.

For information regarding the exclusive, limited warranties applicable to Microchip products, please see Microchip’s standard terms and conditions of sale, which are printed on our sales documentation and available at www.microchip.com.

Parrot Hardware

Signed for and on behalf of Microchip Technology Inc. at Chandler, Arizona, USA.

User Guide

DS40001916A-page 15

Parrot Hardware

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 the following information:

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Microchip’s customer notification service helps keep customers current on Microchip products. Subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest.

To register, access the Microchip web site at http://www.microchip.com/. Under “Support”, click on “Customer Change Notification” and follow the registration instructions.

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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://www.microchip.com/support

Microchip Devices Code Protection Feature

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

User Guide

DS40001916A-page 16

Parrot Hardware

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Legal Notice

Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights unless otherwise stated.

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The Microchip name and logo, the Microchip logo, AnyRate, AVR, AVR logo, AVR Freaks, BeaconThings, BitCloud, CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, Heldo, JukeBlox, KeeLoq, KeeLoq logo, Kleer, LANCheck, LINK MD, maXStylus, maXTouch, MediaLB, megaAVR, MOST, MOST logo, MPLAB, OptoLyzer, PIC, picoPower, PICSTART, PIC32 logo, Prochip Designer, QTouch, RightTouch, SAM-BA, SpyNIC, SST, SST Logo, SuperFlash, tinyAVR, UNI/O, and XMEGA are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

ClockWorks, The Embedded Control Solutions Company, EtherSynch, Hyper Speed Control, HyperLight Load, IntelliMOS, mTouch, Precision Edge, and Quiet-Wire are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, BodyCom, chipKIT, chipKIT logo, CodeGuard, CryptoAuthentication, CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, EtherGREEN, In-Circuit Serial Programming, ICSP, Inter-Chip Connectivity, JitterBlocker, KleerNet, KleerNet logo, Mindi, MiWi, motorBench, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, PureSilicon, QMatrix, RightTouch logo, REAL ICE, Ripple Blocker, SAM-ICE, Serial Quad I/O, SMART-I.S., SQI, SuperSwitcher, SuperSwitcher II, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

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GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries.

All other trademarks mentioned herein are property of their respective companies.

User Guide

DS40001916A-page 17

Parrot Hardware

ISBN: 978-1-5224-1937-2

Quality Management System Certified by DNV

ISO/TS 16949

Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC DSCs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified.

User Guide

DS40001916A-page 18

Worldwide Sales and Service

AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE

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Chandler, AZ 85224-6199

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Technical Support:

http://www.microchip.com/

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Web Address:

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Tel: 33-1-30-60-70-00

Germany - Garching

Tel: 49-8931-9700

Germany - Haan

Tel: 49-2129-3766400

Germany - Heilbronn

Tel: 49-7131-67-3636

Germany - Karlsruhe

Tel: 49-721-625370

Germany - Munich

Tel: 49-89-627-144-0

Fax: 49-89-627-144-44

Germany - Rosenheim

Tel: 49-8031-354-560

Israel - Ra’anana

Tel: 972-9-744-7705

Italy - Milan

Tel: 39-0331-742611

Fax: 39-0331-466781

Italy - Padova

Tel: 39-049-7625286

Netherlands - Drunen

Tel: 31-416-690399

Fax: 31-416-690340

Norway - Trondheim

Tel: 47-7289-7561

Poland - Warsaw

Tel: 48-22-3325737

Romania - Bucharest

Tel: 40-21-407-87-50

Spain - Madrid

Tel: 34-91-708-08-90

Fax: 34-91-708-08-91

Sweden - Gothenberg

Tel: 46-31-704-60-40

Sweden - Stockholm

Tel: 46-8-5090-4654

UK - Wokingham

Tel: 44-118-921-5800

Fax: 44-118-921-5820

User Guide

DS40001916A-page 19

Microchip Technology Parrot User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction

Features

Table of Contents

1. Block Diagram

2. Hardware Details

Microphone

2.2 Filter for ADC

2.3 Microcontroller

DAC

ADC

2.4 Filter for DAC

2.5 Power Amplifier

2.6 User Interfaces

2.6.1 Buttons

2.6.2 LEDs

2.7 External Data Flash

2.8 UPDI Programming Interface

3. Firmware Programming

3.1 Connection

3.2 Firmware

3.3 Programming

4. Revision History

5. Object of Declaration

The Microchip Web Site

Customer Change Notification Service

Customer Support

Microchip Devices Code Protection Feature

Legal Notice

Trademarks

Quality Management System Certified by DNV

Worldwide Sales and Service