STEVAL-MKI138V2 Datasheet, PDF (1/7 Pages) STMicroelectronics – LED status indicator

STEVAL-MKI138V2
STAudioHub USB interface board based on the
MP34DB01 and STM32
Data brief
Features
• 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 (powered and connected
to PC through USB)
• LED status indicator
• RoHS compliant
The STM32 microcontroller decodes the PDM
signal from the microphones and streams the
audio via USB.
The STEVAL-MKI138V2 evaluation board is a
sound card that is 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
audio collected from the microphones to the PC.
It can also be used as an interface board for other
microphone PCBs (STEVAL-MKI126Vx), in which
case it is recommended to use the APWorkbench
software tool.
Description
The purpose of STEVAL-MKI138V2 evaluation
board is to provide an example of decoding and
streaming of digital MEMS microphone outputs.
The STEVAL-MKI138V2 evaluation board hosts
the MP34DB01 (top-port digital microphone),
working as a sensor and the STM32F107RC
microcontroller as an audio decoder.
These microphones are analog-to-digital
transducers. They are capable of sensing sound
pressure and converting this signal into a digital
signal using the PDM technique.
July 2014
DocID026765 Rev 1
For further information contact your local STMicroelectronics sales office.
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