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STEVAL-MKI138V1

STAudioHub USB interface board based on MP34DT01 and STM32
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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.

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Data Brief

Key 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

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Design Resources

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Technical Documentation

Product Specifications

Description Version Size
pdf
DB1918: STAudioHub USB interface board based on MP34DT01 and STM32
2.0 246 KB

Application Notes

Description Version Size
pdf
AN4146: STSmartVoice demonstration board STEVAL-MKI126Vx
2.0 3,511 KB
pdf
AN4184: Microphone coupon boards STEVAL-MKI129Vx /MKI155Vx based on digital microphones
2.0 1,264 KB
pdf
AN4227: Audio hub demonstration kit supporting the M45DT02, MP34DB01, and MP34DT01 microphones
1.0 1,572 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
zip
STEVAL-MKI138V1 gerber files
241 KB

Bill of Materials

Description Version Size
pdf
STEVAL-MKI138V1 BOM
83 KB

Schematic Pack

Description Version Size
pdf
STEVAL-MKI138V1 schematics
1,471 KB

Related Tools and Software

Related Tools and Software

Part Number Description
APWorkbench Audio Processor Workbench software development suite

License Agreement

Description Version Size
pdf
Evaluation products license agreement
1.0 126 KB

Sample & Buy

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Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-MKI138V1ActiveSTM32F107; MP34DT01-72Distributor reported inventory date: 2014-12-20
Distributor NameRegionStockMin. order
ARROWOrder NowEUROPE50
Farnell Element14Order NowEUROPE71
DIGIKEYOrder NowWORLDWIDE61
Ecopack2-

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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