STAudioHub USB interface board based on MP34DT01 and STM32

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.

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

Technical Documentation

Product Specifications
Description Version Size
DB1918 DB1918: STAudioHub USB interface board based on MP34DT01 and STM32 2.0 245 KB
Application Notes
Description Version Size
AN4227 AN4227: Audio hub demonstration kit supporting the M45DT02, MP34DB01, and MP34DT01 microphones 1.0 1 MB
AN4184 AN4184: Microphone coupon boards STEVAL-MKI129Vx /MKI155Vx based on digital microphones 2.0 1 MB
AN4146 AN4146: STSmartVoice demonstration board STEVAL-MKI126Vx 2.0 3 MB

Hardware Resources

Board Manufacturing Specifications
Description Version Size
STEVAL-MKI138V1 gerber files 1.0 240 KB
Bill of Materials
Description Version Size
STEVAL-MKI138V1 BOM 2.0 82 KB
Schematic Packs
Description Version Size
STEVAL-MKI138V1 schematics 1.0 1 MB

Legal

License Agreement
Description Version Size
Evaluation products license agreement 1.0 125 KB

Tools and Software

Development Tools
Software Development Tools
Support & Community
Related Products

Sample & Buy

Part Number Marketing Status Unit Price (US$) * Quantity Core Product ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STEVAL-MKI138V1 Active 72 1 STM32F107; MP34DT01 NEC EAR99 ITALY MORE INFO DISTRIBUTOR AVAILABILITY
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(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STEVAL-MKI138V1 ActiveCARDIndustrialEcopack2
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(**) 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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