STEVAL-MKI138V1 STAudioHub USB interface board based on MP34DT01 and STM32 Description

STEVAL-MKI138V1 STAudioHub USB interface board based on MP34DT01 and STM32 Description
STEVAL-MKI138V1
STAudioHub USB interface board
based on MP34DT01 and STM32
Data brief
Description
Top view
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.
Bottom view
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.
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
June 2013
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Application block diagram
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STEVAL-MKI138V1
Application block diagram
Figure 1. Microphone USB demonstration board block diagram
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Revision history
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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