Audio Board

Playing sounds for notification or alerts is much needed feature in most embedded applications, and Zilogic’s Audio Board is designed to add this feature to any micro-controller board with a SPI interface. The board comprise 8-bit DAC, 4MB DataFlash, AF amplifier and a speaker to play back audio files. The board also features a digital potentiometer, which allows volume control via software.

The Audio board is designed to play raw PCM data samples. The PCM samples are received by the 8-bit DAC via SPI interface, and the converted analog signals are processed with AF amplifier before sent to the on-board speaker. The audio board can be programmed to play PCM data streaming from controller board or play the raw PCM files stored in the on-board 4MB DataFlash. The board also includes an 3mm jack to connect external ear phones.


The Audio Board has the following features

  • MCP4801, 8-bit SPI DAC

  • AT45DB321D, 4MB DataFlash

  • MCP4021, non-volatile digital potentiometer for volume control

  • On board speaker

  • Headphone jack

  • Standard 0.1" FRC header for connection to MCU

  • Ready to go with Zilogic motherboards