4D Systems, Australia


Embedded Audio-Sound Module
This product us RoHS compliant This product is PbFree

Datasheet download Datasheets
Download Reference Circuits
Updated on 16 Mar 2011

Download Sample .ad4 files
Updated on 08 Nov 2009

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If you have trouble regarding SOMO-14D, please visit our specific forum here.


The SOMO-14D is a tiny Audio-Sound module that can play back pre-stored audio files such as voice and music from a micro-SD memory card. The module supports 4-bit ADPCM audio files with sample rates from 6Khz up to 32Khz. By using the freely available software tool, any WAVE(.wav) or MP3(.mp3) file can be easily converted to the ADPCM(.ad4) format which can then be can be saved to a micro-SD memory card. The compact 14pin drop-in-module takes up very minimal board space and is ideal for any application that requires embedded audio. 

The module offers two modes of operation, SERIAL-MODE and the KEY-MODE. 

The SERIAL-MODE provides a simple 2-wire interface to any micro-controller via its DATA and CLK lines. Audio operations such as PLAY, PAUSE, STOP and VOLUME control functions are all available to the host micro via simple serial commands.

The KEY-MODE provides a stand alone operation where a host micro is not required. With only 3 push buttons, a 3.0V battery and a speaker, an extremely compact and low component count MP3-Player like system can be implemented.
In short, the SOMO offers a very flexible, compact and low cost embedded audio solution for many applications.

Please download the Datasheet for the SOMO-14D module:



  • Low-cost module for all embedded Audio-Sound applications.
  • Supports 4-bit ADPCM (.ad4) file formats with sampling rates from 6Khz to 32Khz.
  • SERIAL MODE: Supports a 2-Wire (Data, Clock) interface to any micro-controller.
  • KEY-MODE: Supports a simple stand alone operation without a host micro.
  • Differential 2 line PWM output for direct speaker connection (8 Ohm/0.5W).
  • Dedicated 16-bit DAC audio output to use with an external amplifier.
  • On-board micro-SD memory card adaptor for storing of audio, voice and music files (up to 512 files). 
  • Supports up to 2Gig micro-SD memory cards (FAT16 format).
  • Compact size measuring only 18.3 x 20.8 mm. 
  • 3.0V to 3.8V DC voltage range (single supply).
  • Low Power Idle current of 8.0uA
  • RoHS Compliant.


  • General purpose embedded audio and sound.
  • All voice annunciator systems.
  • Automotive, Parking radar, GPS navigation systems.
  • Elevator, Security, Access-Control and Warning devices.
  • Intelligent home automation and domestic appliances.
  • Robotics and Industrial control.
  • Traffic facilities: Toll gates, parking lots.
  • Toys, learning tools, talking books and all gaming sound effects.
  • MP3 player like music devices.

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