Evaluation and Development Board CML Microcircuits EV6550DHAT

Product Preview
PP/EV6550DHAT/1 December 2019 EV6550DHAT
Raspberry Pi HAT for CMX655D The EV6550DHAT brings together the Raspberry Pi and the CMX655D Ultra-low Power Voice Codec in a
convenient and inexpensive way, enabling easy demonstration of the CMX655D and providing improved
low power audio capabilities to the Raspberry Pi. This is achieved using common hardware and opensource software, creating a platform that is easy to use and that simplifies product development.
Features Two top-ported digital MEMS mics Easy screw connection for external
speaker Flexibility to use local or off-board
power for the PA Accessible GPIO and test pads to allow
further options (e.g. external MEMS) User-modifiable prototype space Option to add line out phono
connector Simple GUI with open-sourced drivers On-board reset button or reset via the
GUI
Applications Demonstrates CMX655D functionality Product development with the
Raspberry Pi
Key Advantages Small, compact design Conforms to HAT definition Huge range of open source compatible
software available Low cost solution One of the major benefits of the hugely-popular Raspberry Pi is
its low power, flexibility and accessible GPIOs which encourage
developers to expand on its basic functionality. The multiway
GPIO header on the latest versions of the board consists of 40
mixed-function pins, 26 of which support general purpose
input/output connections.
The Raspberry Pi HAT (Hardware Attached on Top) is a hardware
standard defining an add-on board that mounts directly onto the
Raspberry Pi and attaches to the GPIO header. The EV6550DHAT …

EV6550DHAT
Raspberry Pi HAT for
CMX655D
UM6550DHAT/1 November 2019 USER MANUAL Provisional Information Features 1 Demonstrates CMX655D functionality
Two digital top-ported MEMS microphones
Easy screw connection for external speaker
Flexibility to use local or off-board power for the PA
Accessible GPIO and test pads to allow further options (e.g. external MEMS)
User modifiable prototype space
Option to add line out phono connector
Simple GUI interface with open-sourced drivers
Conforms to the HAT definition Introduction
The EV6550DHAT brings together the Raspberry Pi and the CMX655D Ultra-low Power Voice Codec in a convenient way,
enabling easy demonstration of the CMX655D and providing improved low power audio capabilities to the Raspberry Pi.
This is achieved using common hardware and open-source software, simplifying its use and simplifying software and
hardware development. 2 CMX655D Ultra-low Power Voice Codec
The CML CMX655D Ultra-low Power Voice Codec integrates two matched channels supporting a large variety of digital
MEMS (Micro-Electromechanical System) microphones and signal processing capability along with a 1 Watt high
efficiency Class D speaker amplifier.
As an inherently low power codec it is ideal for use in low power projects and developments typically based on the
Raspberry Pi.  2019 CML Microsystems Plc Raspberry Pi HAT for CMX655D EV6550DHAT Figure 1 CMX655D Functional Block Diagram
To support evaluation and product developments, the EV6550DHAT is effectively a hardware/software solution that
conveniently and inexpensively brings together the CMX655D and Raspberry Pi. The reader is encouraged to read the full …

Quick Start Guide
EV6550DHAT
Raspberry Pi HAT for
CMX655D
Publication: QS/EV6550DHAT/1
Issue 1 -November 2019 Quick Start Guide for EV6550DHAT 1 Contents
1
2
3
4 Contents . 2
Introduction . 2
History . 2
EV6550DHAT Set up and Operation. 2
4.1
Download of Documents and Software . 2
Figure 1: Mounted EV6550DHAT . 3
4.2
Software Setup . 3
Figure 2: EV6550DHAT GUI Interface . 3 2 Introduction
Thank you for your interest in the EV6550DHAT Raspberry Pi HAT for demonstration of the
CMX655D. This quick start guide will help you get started with the EV6550DHAT. The CMX655D
Datasheet, Raspberry Pi online documentation and the EV6550DHAT User Manual provide full details
on these solutions but this "quick start" guide offers help in getting the EV6550DHAT up and running …