Infineon Audiohub Nano User manual

Please read the Important Notice and Warnings at the end of this document
www.infineon.com page 1 of 9 2019-10-29
Infineon Audiohub - Nano
User Manual
About this document
Scope and purpose
The user manual provides information about using and evaluating Infineon digital XENSIVTM MEMS
microphones with the help of the Audiohub Nano evaluation board. It familiarizes you with the evaluation
board and guides you through the initial set-up and measurement.
Intended audience
Design, verification, test and software engineers can use this document to get an understanding of the
functionality and connections of the Audiohub Nano evaluation board.
Table of contents
About this document....................................................................................................................... 1
Table of contents............................................................................................................................ 1
1Introduction .......................................................................................................................... 2
1.1 Prerequisites............................................................................................................................................2
1.1.1 Hardware............................................................................................................................................2
1.1.2 Software .............................................................................................................................................2
2Features................................................................................................................................ 3
2.1 Summary of features...............................................................................................................................3
2.2 Block diagram..........................................................................................................................................3
3Initial set-up.......................................................................................................................... 4
3.1 USB communication ...............................................................................................................................4
3.2 Host computer set-up .............................................................................................................................4
3.3 Audacity software set-up ........................................................................................................................5
4Evaluation board information.................................................................................................. 6
4.1 Connectors ..............................................................................................................................................6
4.2 Test points...............................................................................................................................................6
4.3 Volume Unit (VU) meter display with onboard LEDs .............................................................................7
4.4 Operating mode and gain configuration with mode switch..................................................................7
4.5 Secondary PDM interface........................................................................................................................7
Revision history.............................................................................................................................. 8

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Introduction
1Introduction
This document serves as a manual for the evaluation of up to two Infineon digital XENSIVTM MEMS microphones
using the Audiohub Nano board in mono or stereo output. The evaluation board provides a USB audio interface
to stream audio data from microphones with any audio recording and editing software.
1.1 Prerequisites
1.1.1 Hardware
Infineon Audiohub Nano evaluation board
Infineon digital XENSIVTM MEMS microphone flex kit
Micro USB cable
1.1.2 Software
Audio editing software that supports 48 kHz and 24-bit recording
FT9xx programming utility for firmware update (optional)

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Features
2Features
2.1 Summary of features
Audio streaming over USB interface
48 kHz sampling rate
24-bit audio data (stereo)
Mode switch for toggling between normal mode and low power mode with four pre-defined gain
configurations
LED indication for the configured gain level in normal mode and low power mode
Volume unit meter display with onboard LEDs
Powered through Micro USB
2.2 Block diagram
Figure 1 Audiohub nano block diagram

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Initial set-up
3Initial set-up
The board can be powered by the Micro USB connector. Connect the Micro USB cable to the board and connect
the cable to a host computer. Insert the microphone flex board to the flex connectors (left and right), as shown
in Figure 2.
Figure 2 Microphones connected to left and right flex connectors
3.1 USB communication
The evaluation board is powered through the Micro USB port. Connect the board to the host computer for
streaming the audio data from the microphones. Any audio recording or editing software (e.g. Audacity) can be
used to record and evaluate the microphones.
3.2 Host computer set-up
To enable the best performance of USB audio recording, the processor resources allocation should be adjusted
to the best performance of background services. Please follow these steps to enable this in the Windows 10
operating system.
Go to Control Panel > System and Security > System > Advanced system settings.
Go to the Advanced tab and click on the Settings button under Performance.
In the pop-up window of Performance options, go to the Advanced tab, select Background services and
apply changes.

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Initial set-up
Figure 3 Host computer system settings
3.3 Audacity software set-up
Audacity is a free and open-source audio editor and recording application. Select the audio source as Audiohub
Nano in the recording software, as shown in Figure 4. The recording channel can be selected as either mono or
stereo.
Figure 4 Recording from Audiohub Nano in Audacity

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Evaluation board information
4Evaluation board information
4.1 Connectors
The Audiohub Nano evaluation board offers a wide variety of connectors listed in Table 1.
Table 1 Connector list
Reference designator
Description
X1
Flex connector for left channel microphone connection
X2
Flex connector for right channel microphone connection
X3
Secondary PDM interface
X11
Programming connector
USB1
Micro USB connector for power and audio streaming
Table 2 Connector X3 detailed pin-out
Pin number
Name
Description
1
VMIC
Microphone VDD
2
MIC DATA1
PDM data signal from microphone
3
MIC CLOCK
PDM clock signal to microphone
4, 5, 6
MGND
Microphone ground
4.2 Test points
Table 3 lists all the available test points for debugging on the Audiohub Nano evaluation board
Table 3 Test point description
Test point
Name
Description
TP1
NetQ1_3
12 MHz from oscillator Q1
TP2
I2S_CLK24
24.566 MHz clock from oscillator Q1 from I2S interface
TP4
VDD3V3
3.3 V power rail
TP5
VDD1V8
1.8 V power rail
TP6
VMIC
Microphone power supply
TP7
GND
Digital ground
TP8
GND
Digital ground

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Evaluation board information
4.3 Volume Unit (VU) meter display with onboard LEDs
The onboard LEDs turn on based on the measured sound pressure levels (dB SPL). The LEDs work as a Volume
Unit (VU) meter when streaming the audio data. The threshold for the LED turn-on is based on the sound
pressure level during the audio streaming, as shown in Table 4.
Table 4 VU meter setting based on sound pressure level
LED reference
dB SPL
dBFS
LED color
D1, D2
50
-80
D3, D4
65
-65
D5, D6
80
-50
D7, D8
94
-36
D9, D10
110
-20
D11, D12
125
-5
4.4 Operating mode and gain configuration with mode switch
The mode switch push button, S1, can be used to switch through various configurations in a sequence. The
settings are defined for configuring the power modes: normal mode and low power mode. The mode switch
button also enables different pre-defined gain configurations on the audio data stream. The gain settings can
be configured when the evaluation board is in idle mode and not recording the audio stream.
On power-up, the evaluation board is set to normal mode with 0 dB gain by default. This configuration is
indicated by LED D3 on power-on.
Table 5 describes the different gain configurations and power modes that can be changed with the mode
switch push button.
Table 5 Operating mode and gain configuration LED reference
LED reference
Operating mode
Gain configuration (dB)
D3
Normal power mode
0
D5
12
D7
18
D9
24
D4
Low power mode
0
D6
12
D8
18
D10
24
4.5 Secondary PDM interface
The connector X3 can be used to connect an external PDM microphone to the evaluation board. Both flex
connectors X1 and X2 are disabled when the microphone is connected to X3. Table 2 describes the detailed pin-
out of the connector X3.

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Revision history
Revision history
Document
version
Date of release
Description of changes
V00_10
2019-10-29
Initial release

Published by
Infineon Technologies AG
81726 München, Germany
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Edition 2019-10-29
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