june 2013 docid024359 rev 2 1/4 4 STEVAL-MKI138V1 staudiohub usb interface board based on mp34dt01 and stm32 data brief features ? powered and connected to pc through usb ? sound card automatically recognized by the pc as an audio device. ? 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 usb ? led status indicator ? rohs compliant description the purpose of STEVAL-MKI138V1 is to provide a demonstration of decoding and streaming of digital mems microphone outputs. the STEVAL-MKI138V1 demonstration board hosts the mp34dt01 (top-port digital microphone), working as a sensor and the stm32f107rc microcontroller, which functions as an audio decoder. these microphones are analog-to-digital transducers. they are capable of sensing sound pressure and converting it to a digital signal using the pdm technique. the stm32 microcontroller decodes the pdm signals from the microphones and streams the audio via usb. the STEVAL-MKI138V1 is a sound card automatically recognized by the pc as an audio device. connection is made through a usb cable, which both powers the board and streams the audio collected from the microphones to the pc. it is also possible to use the STEVAL-MKI138V1 as an interface board for other microphone boards (steval-mki126vx), in which case use of the apworkbench software tool is recommended. top view bottom view www.st.com
application block diagram STEVAL-MKI138V1 2/4 docid024359 rev 2 1 application block diagram figure 1. microphone usb demonstration board block diagram
docid024359 rev 2 3/4 STEVAL-MKI138V1 revision history 2 revision history table 1. document revision history date revision changes 01-mar-2013 1 initial release. 20-jun-2013 2 title has been modified.
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