Transcription of AN5027 Application note - STMicroelectronics
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AN5027 Application note - STMicroelectronics
July 2019AN5027 Rev 21/661AN5027 Application noteInterfacing PDM digital microphones using STM32 MCUs and MPUsIntroductionDigital MEMS (microelectromechanical systems) microphones target all audio applications where small size, high sound quality, reliability and affordability are key requirements. Their combination of small footprint and noise immunity allows the implementation of multiple microphones in a single device, creating an increasing growth of audio in industrial and consumer applications by offering a hands-free human machine interface, noise cancellation, and high quality audio STM32 32-bit Arm Cortex MCUs and the STM32 Arm Cortex MPUs offer a wide audio capability with a rich connectivity, including serial and enhanced voice-acquisition interfaces allowing the user to easily build solution for microphone-based document targets digital MEMS microphones having a pulse-density modulated (PDM) output and describe how to connect them in mono and stereo configurations to STM32 MCUs and MPUs by using the SPI/I2S, SAI and DFSDM peripherals.
digital signal. The STM32 MCUs and MPUs acquire digital data from the microphone(s) through particular pe ripherals to be pr ocessed and transformed into data standard for aud io. The audio data is then handled by the microcontroller according to the targeted audio application. Figure 1. Example of sound acquisition in audio application. a.
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