Knowles IA611 Xplained Pro User manual

Knowles Confidential
IA611 Xplained Pro Hardware User
Guide
External Use
Document #AUD-ESP-00444-V2.0
This document describes the hardware implementation of the Knowles IA611
Xplained Pro Extension Kit (PN IA611-RDI-01). The extension kit is the IA611
Reference Design for IoT designed to be used with the Microchip SAM D21
Explained Pro MCU.

IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 2
Confidential: Copyright 2018, Knowles Corporation
Material contained in this document may not be copied, reproduced, reduced to any
electronic medium or machine readable form or otherwise duplicated and the
information herein may not be used, disseminated or otherwise disclosed, except
with the prior written consent of an authorized representative of Audience, Inc.
Knowles is a registered trademark of Knowles Corporation. IA611, IA61x and the
Knowles logo are service marks or trademarks of Knowles, LLC.
All other trademarks are the properties of their respective owners.
Filename: IA611_Explained_Pro_Hardware_User_Guide.docx

IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 3
Table of Contents
Chapter 1: Introduction ......................................................................... 5
1.1 Document Scope..................................................................................5
1.2 Overview.............................................................................................5
1.3 Product Overview ................................................................................6
1.3.1 Hardware Components................................................................6
1.3.2 Jumper Settings ...........................................................................7
Chapter 2: IA611 Xplained Pro Hardware.................................................. 8
2.1 IA611 HW Connection ........................................................................8
Chapter 3: Schematic ...........................................................................10
3.1 Bill of Materials ................................................................................. 11

IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 4
List of Figures
Figure 1 The IA611 Digital Smart Microphone ........................................... 5
Figure 2 IA611 Xplained Pro Connected to SAM D21 Xplained Pro Development
Board. ......................................................................................... 6
Figure 3 IA611 Xplained Pro Board ......................................................... 6
Figure 4 Jumper Settings for Interfaces ..................................................... 7
Figure 5 Basic Hardware Architecture for IA611 Reference Design for IoT
Platform ...................................................................................... 8
Figure 6 Schematic of the Knowles IA611 Xplained Pro Board......................10

IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 5
Chapter 1: Introduction
The Knowles IA611 Reference Design for IoT is based on IA611 Smart Mic. The
IA611 enables ultra-low power voice and event detection including voice UI
supporting keywords and voice commands and acoustic event detection. To achieve
low power and compact design, it is designed to be implemented with a readily
available MCU board. The implementation discussed is this guide is the IA611
Xplained Pro development board designed to be used with the Microchip SAM D21
Explained Pro MCU.
1.1 Document Scope
The IA611 Xplained Pro Hardware User Guide explains the architecture and design
of the IA611 Xplained Pro development board.
1.2 Overview
The IA611 Smart Mic is a digital top port MEMS microphone with an integrated
DSP for audio processing and low power voice detection/wake.
Figure 1 The IA611 Digital Smart Microphone
The IA611 Smart Mic on the Xplained Pro Extension board will be always listening
for wake words and commands. Upon detection of correct keywords, the IA611 will
send an interrupt to the MCU using P5 / UART_Tx (Pin 15 TX on the Level Shifter)
as IRQ, interrupt to host to signal a wake word detection. The MCU will then wake
up from power saving mode and take actions according to interrupt information
received.

IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 6
Figure 2 IA611 Xplained Pro Connected to SAM D21 Xplained Pro Development Board.
1.3 Product Overview
1.3.1 Hardware Components
Figure 3 IA611 Xplained Pro Board
The IA611 Xplained Pro Development Board contains the following hardware:

IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 7
IA611 Digital Top Port Microphone with integrated DSP
Level Shifter to shift digital signals from the SAMD21 at 3.3V to 1.8V for the
IA611 microphone.
Knowles SPK0641HT4H-1 Digital Microphone
1.8V LDO to power the level shifter, IA611 and SPK0641HT4H-1
microphones
Interface jumpers (2mm) to select desired interface SPI, I2C or UART
(default)
1.3.2 Jumper Settings
Figure 4 Jumper Settings for Interfaces
The IA611 Xplained Pro Development Board contains three sets of jumpers to allow
changing of the interface used to send commands and control the IA611.
Figure 4 shows the location of the jumpers for each of the interfaces. The default
interface is UART and shown in green. The SPI interface can be configured by
placing the jumpers on the SPI block shown in yellow. For I2C interface, the jumpers
may be moved to the I2C block shown in red.
Only one interface can be selected at a time. Only 2 jumpers can be placed at a time
on the blocks and should be paired together on the same interface.

IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 8
Chapter 2: IA611 Xplained Pro Hardware
The IA611 Xplained Pro development board is part of the Knowles IA611 Reference
Design for IoT platform of products that connect the IA61x series of Digital Smart
Microphones to low cost microcontrollers for basic voice wake or voice command
applications.
Figure 5 Basic Hardware Architecture for IA611 Reference Design for IoT Platform
2.1 IA611 HW Connection
The IA611 Xplained Pro development board is connected to the SAM D21
development board through the EXT connector.
The IA611 Xplained Pro board uses a UART for the communication to the DSP
integrated inside the microphone. The UART connects the IA611 to the SAM D21.
The baud rate for the microphone is initially set to 115200 bps but is changed after

IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 9
initialization to increase the speed of software download. For more information, see
the IA611 Xplained Pro Software User Guide for details.
There are 4 GPIO signals in addition to the two UART signals that also connect to
the IA611 through the level shifter. The GPIOs can be used for signaling from the
microphone to the MCU.
Since the IA611 only operates at 1.8V, the IA611 Xplained Pro board contains a
1.8V LDO to generate the necessary voltage for the microphones and the level
shifter.
A second digital microphone (SPK0641HT4H) is connected directly to the IA611
microphone for use in a multi-microphone configuration. This could be useful in
applications where beam forming or noise cancelation may improve performance of
the solution. The SPK0641HT4H can be disconnected from the IA611 through two
zero ohm resistors should all 4 GPIO signals be needed in the desired application.
Three sets of jumpers are installed on the board to allow the user to change the
desired interface. The default setting for the board is to use the UART. To switch to
SPI, the jumpers can be moved from the UART block to the SPI block. This block is
just to the right of the UART block. To use I2C, the jumpers can be moved to the
I2C block located directly above the UART block. Please see the software examples
for each interface to see the correct connections to the SAMD21.

IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 10
Chapter 3: Schematic
Figure 6 Schematic of the Knowles IA611 Xplained Pro Board

IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 11
3.1 Bill of Materials
Part
Value
Device
Manufacturer Part
Number
C1
1.0uF
C-EUC0603
CL10B105KA8NFNC
C2
0.01uF
C-EUC0603
CL10B103KO8NNNC
C3
1.0uF
C-EUC0603
CL10B105KA8NFNC
C4
1.0uF
C-EUC0603
CL10B105KA8NFNC
C5
1.0uF
C-EUC0603
CL21B105KA8NFNC
C6
4.7uF
C-EUC0603
CL10B475KQ8NQNC
C7
0.1uF
C-EUC0603
CL21B104KACNNNC
C8
0.1uF
C-EUC0603
CL21B104KACNNNC
EXT
FE10-2W
LDO1
TLV70218DBVT
TLV70218DBVT
R1
100K
R-US_R0603
RC0603JR-07100KL
R2
0
R-US_R0603
R3
0
R-US_R0603
R4
0
R-US_R0603
R5
0
R-US_R0603
SPK0641
SPK0641HT4H-1
SPK0641HT4H-1
IA611
SHAPIRO2_SPKSHAPIRO_SPK_2
SHAPIRO2_SPKSHAPIRO_SPK_2
U1
TXS0108ERGYR
TXS0108ERGYR
TXS0108ERGYR
U2
ATSHA204A-MAHCZ-T
ATSHA204A-MAHCZ-T

IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 12

IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 13
Revision History
The following lists the changes made since the previous version of this document.
Version
Revision Date
Author(s)
Comments
1.0
1/26/2018
Popper/Cawley
Release
1.0.1
2/20/2018
Cawley
Update DMIC and graphics.
1.02
3/27/2018
Popper
Updated Schematic and DMIC
2.0
4/6/2018
Popper
Release for V3 hardware adding
support for I2C and SPI.

IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 14
Knowles Intelligent Audio
331 Fairchild Drive
Mountain View, California 94043
USA
Tel: [phone]
Fax: [phone]
www.knowles.com
Copyright © 2018 Knowles Corporation
Product specifications are subject to change without
notice. All TRADEMARKS are recognized as the
property of their respective owners.
Rev. 5/10/18