STEVAL-MKI117V1

STEVAL-MKI117V1 MEMS microphone demonstration board based on the MP34DT01 and STM32 Data brief Features ■ Powered and connected to PC through USB ■ Sound card automatically recognized by the PC as an audio device ■ The onboard microphones are digital MEMS devices ■ MEMS microphones provide a high frequency data stream (1 to 3.25 MHz) of 1-bit digital samples (PDM technique) ■ Audio collected from the microphones is sent to the PC through the USB ■ LED status indicator ■ RoHS compliant Description The purpose of the STEVAL-MKI117V1 demonstration board is to provide an example of the decoding and streaming of digital MEMS microphone outputs. The STEVAL-MKI117V1 demonstration board hosts the MP34DT01 (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-MKI117V1 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. March 2012 Doc ID 023000 Rev 1 For further information contact your local STMicroelectronics sales office. 1/5 www.st.com 5 2/5 Doc ID 023000 Rev 1 & Q) ,2  86%/&  ,2 ,2  9%86  8  *1'  ,2 ( & 4   5  5 N 5        ( 5 . 4  86%'3  5 5 51& 86%'0    ' /(' & Q) 9&&B86%    ' /(' 5  %($'  / ,1'8&725 & X)   5   . & Q) -3 -3      287 287 Q)  . 5      -706 &   /0/0 $'- 287 287 ,1 8  5 . 287 /'6;; 9,1+ 9,1 8   0LQL7\SH% '  ,'  *1'  % % &   670B,6B%,&. 5 .  9%86  '    5 N 8&B9''    670B,6B/5&. 5 . 9 & X) 9 & X)    - 8&B9''   %($' %($'  / ,1'8&725  $B9'' 0,&B9'' / ,1'8&725 8&B9''   -       ;B+($'(5   -803(5B3 - . 5 5 N  9&&B86%   *1' 9&&B86%    8&B9'' 5 . 8&B9'' %