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STMicroelectronics STEVAL-MKI129V4
- Part No.:
- STEVAL-MKI129V4
- Manufacturer:
- STMicroelectronics
- Category:
- Expansion Boards, Daughter Cards
- Package:
- Datasheet:
-
STEVAL-MKI129V4.pdf
- Description:
- COUPON BOARD MP34DT04
- Quantity:
- Payment:
- Shipping:
Inventory:2,181
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Product details
Overview
STEVAL-MKI129V4 from STMicroelectronics is a microphone coupon daughterboard hosting four MP34DT04 top-port digital MEMS microphones, designed for PDM audio acquisition and beamforming evaluation in voice-enabled systems. It operates from 1.6–3.6 V, delivers 64 dB SNR and −26 dBFS sensitivity, and features 120 dB SPL acoustic overload point with omnidirectional response.
For engineers reviewing the STEVAL-MKI129V4 datasheet, STEVAL-MKI129V4 pinout, STEVAL-MKI129V4 application, or STEVAL-MKI129V4 equivalent, this board enables rapid validation of multi-microphone PDM signal chains, integration with X-NUCLEO-CCA02M1 for NBW algorithm development, and modular detachment for individual microphone characterization on the STEVAL-MKI126Vx Smart Voice kit.
Technical Context
The board implements a fixed-layout 4-microphone array with identical MP34DT04 devices, each providing single-bit PDM output synchronized to an external clock. All microphones share common power and ground routing optimized for low-noise digital audio capture.
No onboard clock generation or PDM-to-I²S conversion is present; timing and data processing are fully delegated to the host board (e.g., X-NUCLEO-CCA02M1 or STEVAL-MKI126Vx), requiring external PDM clock input and GPIO-accessible PDM data lines for all four channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Microphone Count | 4 × MP34DT04 devices, enabling stereo or quad-channel PDM acquisition for direction-of-arrival or noise suppression algorithms |
| Supply Voltage | 1.6 V to 3.6 V - compatible with standard STM32 Nucleo logic rails and Smart Voice kit power domains |
| Acoustic Overload Point | 120 dB SPL - supports loud-environment testing without clipping in voice assistant or industrial monitoring use cases |
| SNR | 64 dB - ensures usable dynamic range for far-field speech capture when paired with appropriate decimation filters |
| Sensitivity | −26 dBFS - calibrated reference level enabling consistent gain staging across multiple boards in array configurations |
| Output Format | PDM (single-bit) - requires host-side decimation (e.g., via STM32 DFSDM peripheral) to produce PCM audio |
Availability
STEVAL-MKI129V4 is available at Aetrix Electronics and suitable for voice interface prototyping, smart speaker development, and industrial acoustic monitoring requiring stable component supply and validated MEMS microphone array hardware.
Supply support for STEVAL-MKI129V4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, sensors, power ICs, and analog/mixed-signal products for industrial, automotive, and consumer applications.
This board belongs to ST's STEVAL (ST Evaluation) series, developed specifically to accelerate sensor-based system validation and algorithm development for voice, motion, and environmental sensing applications.
FAQ
Does STEVAL-MKI129V4 include a microcontroller or audio processor?
No. The board contains only passive components and four MP34DT04 MEMS microphones. It has no onboard MCU, DSP, or clock generator. All signal processing, PDM clocking, and data capture must be handled by the host board (e.g., X-NUCLEO-CCA02M1 or STEVAL-MKI126Vx).
Can STEVAL-MKI129V4 be used standalone without a carrier board?
No. It is a daughterboard requiring mechanical and electrical connection to either the STEVAL-MKI126Vx Smart Voice kit or the X-NUCLEO-CCA02M1 expansion board. It lacks power regulation, USB interface, or debug circuitry needed for independent operation.
What is the purpose of the "coupon" design?
The coupon layout allows physical separation of individual microphone sections after scoring along pre-defined break lines. Each detached section retains full electrical functionality, enabling isolated characterization or placement flexibility in custom mechanical enclosures.
Which PDM clock frequency is required for proper operation?
The MP34DT04 microphones require a PDM clock between 1 MHz and 3.25 MHz. Typical use with STM32-based hosts employs 1.024 MHz or 1.536 MHz, aligning with DFSDM filter configurations that yield 16 kHz or 24 kHz PCM output after decimation.
STEVAL-MKI129V4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Platform:
- -
- Type:
- Audio
- Function:
- Microphone
- Utilized IC / Part:
- MP34DT04
- Contents:
- Board(s)
STEVAL-MKI129V4 FAQ
1.How can I place an order for STEVAL-MKI129V4 through Aetrix?
Please submit a Request for Quotation (RFQ) for STEVAL-MKI129V4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STEVAL-MKI129V4 reliable?
The price and inventory of STEVAL-MKI129V4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STEVAL-MKI129V4 is usually 5 days.
3.What payment methods are accepted for STEVAL-MKI129V4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STEVAL-MKI129V4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STEVAL-MKI129V4?
STEVAL-MKI129V4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STEVAL-MKI129V4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STEVAL-MKI129V4?
For technical support, including STEVAL-MKI129V4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STEVAL-MKI129V4 requirements.
6.How does Aetrix verify that STEVAL-MKI129V4 is sourced from the original manufacturer or authorized distributors?
All STEVAL-MKI129V4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STEVAL-MKI129V4 meets industry standards.
7.What is the process for return or replacement of STEVAL-MKI129V4?
All STEVAL-MKI129V4 units undergo pre-shipment inspection (PSI). If there is an issue with STEVAL-MKI129V4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STEVAL-MKI129V4 part is unused and in its original packaging.
Return procedure for STEVAL-MKI129V4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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