STMicroelectronics MEMS microphone demonstration board based on the MP34DB01 and STM32 STEVAL-MKI116V1 STEVAL-MKI116V1 Data Sheet

For further information contact your local STMicroelectronics sales office.

March 2012

Doc ID 022999 Rev 1

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MEMS microphone demonstration board based on the

 MP34DB01 and STM32

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Powered and connected to PC through USB 

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Sound card automatically recognized by the 
PC as an audio device

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The onboard microphones are digital MEMS 
devices 

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MEMS microphones provide a high frequency 
data stream (1 to 3.25 MHz) of 1-bit digital 
samples (PDM technique)

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Audio collected from the microphones is sent to 
the PC through the USB 

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LED status indicator

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RoHS compliant

The purpose of the STEVAL-MKI116V1 
demonstration board is to provide an example of 
the decoding and streaming of digital MEMS 
microphone outputs.

The STEVAL-MKI116V1 demonstration board 
hosts the MP34DB01 (bottom-port digital 
microphone), working as a sensor, and the 
STM32F107RC microcontroller, working as an 
audio decoder. 

These microphones are analog-to-digital 
transducers. They are able to sense sound 
pressure and convert this signal into a digital 
signal using the PDM technique.

The STM32 microcontroller decodes the PDM 
signal coming from the microphones and streams 
the audio via the USB.

The STEVAL-MKI116V1 demonstration board is a 
sound card automatically recognized by the PC 
as an audio device. Connection is made through a 
USB cable which also supplies the board and 
then streams the collected audio.