DescriptionThis board demonstrates how to add audio playback to any application using a general-purpose ST7 microcontroller. The audio player demonstration board reconstructs audio signals through the PWM of the ST7FLITES2 microcontroller, and a serial Flash is used to store the audio data in a binary file format. Once the data is stored, the microcontroller reads it through an SPI interface and generates the sound using the PWM feature. A sixth order low-pass filter removes any unwanted high-frequency components from the signal before passing it to a speaker.STEVAL-ICV001V1www.st.comBoard schematicSTEVAL-ICV001V12/5 1 Board schematicFigure 1.Voice annunciation: schematic 1USE INTERNAL 1% 1-MHz RCOSCILLATOR CLOCK SOURCECONFIGURE PLL TO 8X FOR8-MHz INTERNAL CLOCK CONFIGURATION NOTES:USE INTERNAL LVD RESETPOWER-ON INDICATOR SOCKET PARTPin-9 has to be connected to theCLKIN pin of the ST7 when the clockis not available in the applicationor if the selected clock option isnot programmed in t Features 1% calibrated on-chip RC oscillator Low-voltage detector (LVD) on chip Small footprint Low-power operation Supports lower density serial Flash if fewer messages needed Order of filter can be reduced for further cost savings DescriptionThis board demonstrates how to add audio playback to any application using a general-purpose ST7 microcontroller. The audio player demonstration board reconstructs audio signals through the PWM of the ST7FLITES2 microcontroller, and a serial Flash is used to store the audio data in a binary file format. Once the data is stored, the microcontroller reads it through an SPI interface and generates the sound using the PWM feature. A sixth order low-pass filter removes any unwanted high-frequency components from the signal before passing it to a speaker.STEVAL-ICV001V1www.st.comBoard schematicSTEVAL-ICV001V12/5 1 Board schematicFigure 1.Voice annunciation: schematic 1USE INTERNAL 1% 1-MHz RCOSCILLATOR CLOCK SOURCECONFIGURE PLL TO 8X FOR8-MHz INTERNAL Data BriefFor further information contact your