for further information contact your local stmicroelectronics sales office. march 2012 doc id 023001 rev 1 1/5 5 STEVAL-MKI117V2 mems microphone demonstration board based on the mp45dt02 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-MKI117V2 demonstration board is to provide an example of the decoding and streaming of digital mems microphone outputs. the STEVAL-MKI117V2 demonstration board hosts the mp45dt02 (top-port digital microphone), working as a sensor, and the stm32f107rc microcontroller, working as an audio decoder. these microphones are analog-to-digital transducers, in other words, 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-MKI117V2 demonstration board is a sound card automatically recognized by the pc as an audio device. the connection is made through a usb cable which also supplies the board and then streams the collected audio. www.st.com
schematics STEVAL-MKI117V2 2/5 doc id 023001 rev 1 1 schematics figure 1. schematic diagram (1 of 2) $ 0 y - 7 $ * 3 r z h u 6 x s s o \ 5 . 5 . 5 . , 1 2 8 7 2 8 7 $ ' - 2 8 7 2 8 7 8 / 0 / 0 & x ) 5 . 5 . / , 1 ' 8 & 7 2 5 % ( $ ' ' / ( ' & q ) 5 & q ) & x ) / , 1 ' 8 & 7 2 5 % ( $ ' & q ) 5 5 5 . 5 . ( % & 4 ( % & 4 5 n 5 n 5 . 5 n 5 ' / ( ' 5 5 1 & / , 1 ' 8 & 7 2 5 % ( $ ' - ; b + ( $ ' ( 5 - 3 - 3 & q ) & x ) - - 8 0 3 ( 5 b 3 , 2 * 1 ' , 2 , 2 9 % 8 6 , 2 8 8 6 % / & 9 % 8 6 ' ' , ' * 1 ' - 0 l q l 7 \ s h % 9 , 1 * 1 ' 9 , 1 + % < 3 $ 6 6 2 8 7 8 / ' 6 ; ; 9 & & b 8 6 % 9 & & b 8 6 % $ b 9 ' ' 8 & b 9 ' ' 8 6 % ' 0 8 6 % ' 3 9 & & b 8 6 % 8 & b 9 ' ' 8 & b 9 ' ' 8 6 % b ' , 6 & 8 & b 9 ' ' 0 , & b 9 ' ' - 7 0 6 6 7 0 b , 6 b % , & . 6 7 0 b , 6 b / 5 & . 1 5 6 7 - 7 & . 9 9 8 & b 9 ' ' - 5 6 7
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revision history STEVAL-MKI117V2 4/5 doc id 023001 rev 1 2 revision history table 1. document revision history date revision changes 27-mar-2012 1 initial release.
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