Audio-Sound Module - SOMO-14D - Bangalore

The SOMO-14D is a tiny audio module that can play back stored audio files from a micro-SD memory card. The module supports 4-bit ADPCM audio files (.ad4) with sample rates from 6kHz up to 32kHz. The compact 14-pin module takes up very minimal board space and is ideal for any application that requires embedded audio.

A free software tool, which can convert any WAVE(.wav) or MP3(.mp3) file to the ADPCM(.ad4), is linked below. The .ad4 file can be saved to a uSD card and playback can be controlled via one of two methods: serial or key.

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 3V battery and a speaker, an extremely compact and low component count MP3-Player like system can be implemented.

Features:

Low-cost module for all embedded Audio-Sound applications.
Supports 4-bit ADPCM (.ad4) file formats with sampling rates from 6Khz to 36Khz.
Two operation modes:
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/PWM 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 64Mb to 2Gig micro-SD memory cards (FAT format).
Compact size measuring only 18.3 x 20.8 mm.
2.7V to 3.6V DC voltage range (single supply).
Low Power Idle current of 8.0uA
RoHS Compliant