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MEMS microphone evaluation board based on STA321MPL and MP34DB01 (microphone processor + digital uPhone MEMS)
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The STEVAL-MKI126V2 system evaluation board can connect up to six microphones using the sockets provided or through a dedicated six-microphone array.

The digital interface of the device allows interfacing the MIC output to the most widely used audio receivers and digital amplifiers or simple evaluation of the MIC using generic audio measurement equipment. The filtered PWM signals allow the connection of a headset to listen to the audio received through the microphones.

The fully digital path ensures a high level of processing with sound preconditioning, filtering and voice enhancement.

The main purpose of the STEVAL-MKI126V2 is to convert the PDM signals provided by the microphones into the more common I2S and PWM signals. The I2S signal is routed both on general and interface connectors, while the suitably-filtered PWM signals provide an analog interface.

Mounted on the STEVAL-MKI126V2 are two MP34DB01 microphones and an STA321MPL processor.

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Data Brief

Key Features

  • 2 MP34DB01 MEMS microphones
  • Capable of driving up to 6 digital MEMS microphones
  • 3 independent I2S outputs
  • Up to 10 independent 32-bit user programmable biquads per channel
  • Fully configurable with:
  • STEVAL-MKI29V1/V2/V3
  • STEVAL-MKI131V1/V2/V3
  • STEVAL-MKI117V1/V2
  • Controllable via APWorkbench software suite
  • RoHS compliant


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB2050: MEMS microphone system evaluation board based on the STA321MPL and MP34DB01
1.0 306 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-MKI126V2 gerber files
2.0 583 KB

Bill of Materials

Description Version Size
2.0 10 KB

Schematic Pack

Description Version Size
STEVAL-MKI126V2 schematics
2.0 96 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-MKI126V2ActiveSTA321MPL; MP34DB01Buy Direct99.22Distributor reported inventory date: 2016-02-11
Distributor NameRegionStockMin. order

(*) 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 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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