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CML Micro EV6550DHAT Raspberry Pi HAT

CML Micro EV6550DHAT Raspberry Pi HAT combines the Raspberry Pi and the CMX655D Ultra-Low Power Voice Codec conveniently and inexpensively. The combination enables the easy demonstration of the CMX655D and provides improved low-power audio capabilities to the Raspberry Pi. This is achieved using common hardware and open-source software, creating a platform that is easy to use and simplifies product development.

A Raspberry Pi HAT (Hardware Attached on Top) is an add-on board that mounts directly onto the GPIO header of a Raspberry Pi B+ Single Board Computer (SBC).  The EV6550DHAT conforms to this standard and integrates the functionality of the CMX655D Ultra-low Power Voice Codec into the Raspberry Pi environment. 

The EV6550DHAT enables the CMX655D Voice Codec's feature set (two matched channels supporting a wide variety of digital MEMS microphones, signal processing, and a 1W high-efficiency Class D speaker amplifier) to be easily demonstrated. Control and demonstration of the CMX655D are handled via a Graphic User Interface (GUI) that is pre-loaded into the EEPROM. The GUI allows for the recording of audio files at 8ksps, 16ksps, 32ksps, or 48ksps, with adjustment of input audio gain from -12dB to +3dB. Control of playback volume can be adjusted from -90dB to 0dB, and muting and smoothing are also available. Four pre-recorded samples can be played at different rates to compare sample rate and audio quality.

Features

  • Small, compact design conforms to Raspberry Pi HAT standards
  • Wide range of open-source compatible software available
  • 2x top-ported digital MEMS mics
  • Easy screw connection for external speaker
  • Flexibility to use local or off-board power for the amplifier
  • Accessible GPIO and test pads to allow further options, such as external mics
  • User-modifiable prototype space
  • Option to add a 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

GPIO Signal Path

Block Diagram - CML Micro EV6550DHAT Raspberry Pi HAT

Documents

Related Codec

CML Micro CMX655D Ultra-Low Power Voice Codec

Flexible, low-power codec with an integrated MEMS microphone interface and class-D speaker driver.

Learn Moreom CML Micro CMX655D Ultra-Low Power Voice Codec View Productsrelaterat till CML Micro CMX655D Ultra-Low Power Voice Codec
Publicerad: 2019-12-20 | Uppdaterad: 2023-08-07