4D Systems SOMO-II Embedded Audio-Sound Module

4D Systems SOMO-II (Sound Module 2) is a tiny Audio-Sound module that can play MP3 audio files stored on a micro-SD card (or USB 2.0 Flash drive with extra components), such as voice and music. The SOMO-II features an onboard 16bit MCU, specifically designed for hardware audio decoding. The SOMO-II supports both FAT16 and FAT32 formatted micro-SD and USB Flash Drives up to 32Gb in size, and features a 24-bit DAC output with support for all MP3 bit rates (11172-3 & ISO13813-3 3 Layer Audio Decoding) with 8Khz to 48Khz Sampling Rate. The compact 16pin drop-in-module takes up very minimal board space and is ideal for any application that requires embedded audio. The SOMO-II features an on-board mono Amplifier capable of driving a 4ohm 3 Watt speaker directly (see Section 4.4). It also features stereo DAC output for connecting directly to headphones or into an external amplifier. With only 2 push buttons, a 3.3V to 5V battery, and a speaker, an extremely compact and low component count MP3-Player like system can be implemented. In short, 4D Systems SOMO-II offers a very flexible, compact, and low cost embedded audio solution for many applications.


  • Low-cost module for all embedded Audio Sound applications
  • Supports all MP3 bit rates 11172-3 & ISO1381303 with Samples rates from 8Khz to 48Khz
  • 24-bit DAC output, dynamic range support 90dB, SNR supports 85dB
  • SERIAL MODE: Supports a 2-Wire 3.3V TTL UART interface to any micro-controller
  • KEY-MODE: Supports a simple stand-alone operation without a host micro
  • Mono amplified Speaker output, capable of driving a 4ohm speaker at 3 Watts (5V supply)
  • DAC audio output to use with an external amplifier or with headphones
  • On-board micro-SD memory card adaptor for storing of audio, voice, and music files
  • Supports up to 32GB micro-SD memory cards, and both FAT16 and FAT32 file formats
  • Supports up to 32GB USB 2.0 Flash Drive, when used in conjunction with a USB socket (not onboard), supporting both FAT16 and FAT32 file formats
  • Compact size measuring only 21.0mm Long x 20.5mm Wide x 11.3mm High
  • 3.3V to 5.0V DC voltage range (single supply)
Publié le: 2014-04-11 | Mis à jour le: 2022-03-11