Knowles Confidential

knowles.com | IA611-RDI-01 Product Brief Rev 4

@2018; Knowles Electronics, LLC, Itasca, IL, USA, All Rights Reserved.,

Knowles and the trademarks of Knowles Electronics, LLC

IA611 Reference Design to develop

VUI (Voice User Interface) for IoT

The IA611-RDI-01 is a reference design based on

IA611 SmartMic for IoT applications. It enables ultra-

low power acoustic event detection, voice keyword

detection and voice commands to develop a voice UI.

To accelerate prototyping the SmartMic into an IoT

application, the IA611 has been integrated with the

Microchip SAM D21 Xplained Pro MCU board.

Ultra-Low Power Voice Wake and Event

Detection

The core of the reference design is the IA611 SmartMic designed

for ultra-low power in a digital mic package. IA611 supports

Knowles VoiceQ,

the world’s first “always listening” voice detector

capable to automatically adapt its performance to the acoustic

environment and enable voice wake keyword/ command. The

reference design also includes a second digital mic to improve

performance if required by the IoT application.

Highly Integrated, All-in-One Kit

Knowles intelligent mic solutions are integrated with several

leading MCU and AP suppliers. The kit supports a Microchip SAM

D21 Xplained PRO with full support via Atmel Studio 7. It allows

for rapid prototyping of IoT designs that use an MCU processor

that is already tested, optimized for BOM, and performance. A

downloadable extension provides sample code for a simple

application and required libraries to develop a VUI pre-integrated

with the SmartMic as a peripheral.

IA611 Details

Hardware Details

 IA611 SmartMic with 40MHz, 32-bit floating point DSP. It

has 168KB memory available for user applications.

 SPK0641HT4H-1 DMIC serves as 2nd mic for 2-ch voice input

capability. It is ideal to support 2-ch voice recognition

enhancing

algorithm

to

improve

the

detection

performance.

 Level Shifter is included in the hardware in case the MCU

does not support 1.8V interface.

 MCU is an optional part and a low cost MCU serves as host

to control IA611 SmartMic. IA611 firmware will be

downloaded from the MCU stored in the flash. Currently,

Microchip SAM D21 32-bit MCU is available.

DSP Core

Knowles HemiDelta Light

Audio Interfaces

DMIC and I2S/TDM

Control Interfaces

SPI, I2C, UART, available GPIOs.

Memory

168 KB (IA611)

System Requirements

1.8V

IA611-RDI-01 IA611 Xplained

Pro Development Kit