EV6550DHAT CML Microcircuits

EV6550DHAT Raspberry Pi HAT for CMX655D UM6550DHAT/2 February 2021 USER MANUAL Provisional Information Features 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 1 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. 2021 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 CMX655D datasheet before progressing with the EV6550DHAT. 2021 CML Microsystems Plc 2 UM6550DHAT/2