Infineon MERUS Hat ZW with Volumio Quick Start Manual

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QUICK START GUIDE
Infineon Technologies
MERUSTMAudio amplifier Hat ZW with Volumio
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Product overview and features
Overview
The MERUSTMAudio amplifier is a Hardware at the Top (HAT) audio power amplifier board which brings the
Infineon proprietary multilevel technology to Raspberry Pi users and makers. It is intended for loudspeaker building and wireless music streaming with minimum size and consumption, state of the art power efficiency and HD audio quality. It is equipped with the MERUSTMMA12070P class D Audio amplifier. Key features include:
Compatible with Raspberry Pi Zero and Raspberry Pi Zero Wireless Compatibility with major streaming applications for Raspberry Pi (Volumio, Justboom Player, Max2play) No need for external or extra power supplies in addition to the 5V USB supply
Full Hardware control, customization, and error monitoring through Linux Alsamixer
General features and audio performance
Number of audio channels
2xBTL, 1
xPBTL.
Audio input format
Digital
(I2S)
Minimum power supply requirement (
miro USB supply)
5V@2.5A
DC
Minimum power supply requirement (power bank
)
5V@2.1A
DC 3000mAH
Output Power/
ch (instantaneous peak – measured with
music)
20W@4ohm
THD+N
<
0.014% 1W 1KHz RL=4ohm
Overall
system efficiency
66%
1W/ch 4ohm
Figure 1. Overview of the MERUS™ Audio amplifier HAT ZW
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System diagram
Product overview and features
MERUSTMAudio amplifier HAT board
Figure 2. MERUSTMAudio amplifier HAT ZW system diagram
MERUS
TM
MA12070P
Speaker output
terminals
USB 5V power supply for both MERUSTMamp HAT and Raspberry Pi
Boost converter 5V to 20V
Figure 3. Top board view of MERUSTMaudio amplifier HAT ZW
+
-
-
+
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Hardware setup
Attach boards
Do not connect the power supply. Continue with the software setup.
Hold
Attach the MERUS
TM
HAT to the
Raspberry Pi using 2.5M screws and
2.5M 4mm length spacers.
Secure assembly
Secure both boards assembly with
2.5M spacers or nuts.
Figure 4. Assembly procedure of the Raspberry Pi + HAT
Figure 5. Completed assembly of the Raspberry Pi + HAT.
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3 – Burn the image to the SD card
1 - Volumio MERUSTMamplifier image
2 – Balena etcher
Software setup
Download the “VolumioMerusAmp.img”
image file from the Infineon MERUS
TM
Audio amplifier HAT site.
Download balena etcher (or any other
SD card image burner) from this link
and open it.
Insert your SD card in the windows,
linux or macOS host machine and burn the downloaded Volumio image file into the card.
Figure 6. Using balena etcher to burn the SD card
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6 – Initial configuration menu
4 – Insert SD card in the Pi
5 – Connect to volumio.local/
Software setup
After the burning process insert the SD
card in the Raspberry Pi and turn it on.
connect your host machine or mobile phone
to “Volumio” network and then type http://volumio.local/ into your web browser to access the configuration screen. Password is “volumio2.
Go through the initial configuration menu
and follow the instructions in the Volumio GUI to finish your configuration. This menu will appear automatically the first time you boot the Raspberry Pi.
Figure 7. Assembly procedure of the Raspberry Pi + HAT
Figure 8. Assembly procedure of the
Raspberry Pi + HAT
Figure 9. Volumio initial configuration
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9 – Configure the network
7 – Insert SD card in the Pi
8 – Configure output device
Software setup
Select the language, press next and
then select the name of your device.
Next, go to settings and make sure the
“I2S DAC” option is OFF and in “Playback
options” select “snd_rpi_merus_amp” as output device.
Continue to the network setting and select
the network you want to connect the
Raspberry Pi to. Optionally configure the music and finish the initial configuration.
Figure 10. Volumio initial configuration: Language and name
Figure 11. Volumio initial configuration: Output device
Figure 12. Volumio initial configuration: Network
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December 2019 Copyright © Infineon Technologies AG 2019. All rights reserved.
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12 – Audio resampling
10 – Playback options
11 – Volume options
Software setup
Go to the settings menu on the top right corner and
select playback options. Make sure the “I2S DAC”
option is OFF and in “Playback options” select
snd_rpi_merus_ampas Output device. Press
save.
In Volume options select “Software” as
Mixer type to allow the protection mechanisms of the HAT to work properly. Press save.
In the Audio resampling section turn on the
audio resampling option. Select 24as target bit depth, “native” as target sample rate. Press save.
Figure 13. Volumio settings menu: Playback options
Figure 14. Volumio settings menu: Volume options
Figure 15. Volumio settings menu: Audio resampling
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13 – Enable SSH
14 – Connect trough SSH
Software setup
Type “<your_raspberry_pi_ip_address>/DEV” or
volumio.local/DEV” on your host machine’s web
browser and press “ENABLE” under the SSH section. There will be no output warning or message after enabling the SSH option.
Download putty and login trough ssh into the
Raspberry Pi with the Raspberry Pi address in the host name address. Click “open” and then “yes”. Then login with volumioas user and “volumio” as password.
Figure 16. Enable SSH in volumio.local/dev
Figure 17. Connecting trough SSH in putty
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15 – Alsamixer and limiter settings
Software setup
Type alsamixer on the command line and acces the MA12070P
control mixer to set the protection limiter level of the device. Usually a -15dB setting will be a good starting point for 4ohm nominal impedance speakers. It is strongly recommended to go through the user’s guide section, where this topic is covered, to correctly
configure the limiter threshold level. Press escape to exit the mixer.
Figure 18. MERUSTMHAT Alsamixer
16 – Turn off and reboot
Turn off the Raspberry Pi by disconnecting the
power supply. Connect the loudspeakers to the
terminal blocks and turn on the Raspberry Pi again.
Figure 19. MERUSTMHAT terminal blocks for loudspeaker
connection
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17 – Playing audio from Volumio GUI
Software setup
Go to the Volumio GUI by typing
“<your_raspberry_pi_ip_address>/DEV” orvolumio.local/DEV” on your host machine’s
web browser. Select browse to select any music or radio stations and press play. Be
careful with the volume the first time you play.
Figure 20. Volumio GUI’s main screen (playback).
18 – Playing audio with Airplay
Open any Airplay compatible device/app such as
Spotify and select your device from the list to play music from the HAT.
Figure 21. Selecting Volumio device on Spotify with Airplay.
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