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

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

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

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

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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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_amp” as 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 “24” as 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 “volumio” as 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” or “volumio.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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