STMicroelectronics STEVAL-MKI109V3

Overview

STEVAL-MKI109V3 from STMicroelectronics is a professional MEMS evaluation motherboard built around the STM32F401VE ARM Cortex-M4 microcontroller (84 MHz, 512 KB Flash, DSP/FPU), designed to interface with ST's full family of DIL24 MEMS adapter boards for sensor characterization and system-level validation. It supports both I²C and SPI communication modes, delivers software-adjustable sensor supply voltage (0–3.6 V), and integrates dual-channel real-time power monitoring (voltage/current) for MEMS devices - enabling precise replication of target application operating conditions in industrial and consumer motion-sensing development.

For engineers reviewing the STEVAL-MKI109V3 datasheet, STEVAL-MKI109V3 pinout, STEVAL-MKI109V3 application, or STEVAL-MKI109V3 equivalent, this board serves as a production-grade reference platform for evaluating ST's high-resolution accelerometers, gyroscopes, pressure sensors, and 6-axis inertial modules - with USB 2.0 full-speed connectivity, SWD/JTAG debugging, DFU firmware update capability, and compatibility with Unico GUI across Windows, macOS, and Linux.

Technical Context

The board implements a dual-channel programmable power supply using AS21P2TLR digital potentiometer-controlled linear regulators, enabling independent software-set VDD_DUT and VDDIO_DUT outputs (0–3.6 V) with 10 mV resolution. Sensor supply current is measured via precision differential amplifiers (TSZ122IQ2T, TSV632IQ2T) with selectable gain (1×–100×) and logarithmic/linear scaling.

Signal conditioning includes level-shifting (SN74AVC4T245RSVR, NTS0104GU12) for 1.2–5.5 V logic compatibility, Bluetooth module support (UART interface), and dedicated analog front-end circuitry for ADC-based power telemetry (ADC_V_REF = 3.00 V reference, 12-bit internal ADCs on STM32F401VE). The STM32F401VE handles real-time sensor data acquisition, OIS/EIS preprocessing, and host PC communication via USB CDC ACM class.

Key Specifications

Availability

STEVAL-MKI109V3 is available at Aetrix Electronics and suitable for MEMS sensor evaluation, industrial motion control prototyping, and consumer electronics inertial module validation requiring stable component supply and long-term design-in support.

Supply support for STEVAL-MKI109V3 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 specializing in microcontrollers, MEMS sensors, power management, and automotive ICs, with R&D and manufacturing facilities across Europe, Asia, and the Americas.

This board belongs to ST's STEVAL (ST Evaluation) series - a portfolio of ready-to-use development platforms engineered to accelerate time-to-market for applications leveraging ST's proprietary MEMS technology, including industrial condition monitoring, wearable health devices, and smart home motion interfaces.

FAQ

What software tools are officially supported for STEVAL-MKI109V3?

ST provides three official Unico GUI packages: STSW-MKI109W (Windows), STSW-MKI109M (macOS), and STSW-MKI109L (Linux). These tools enable real-time sensor data streaming, waveform visualization, register configuration, power profiling, and firmware updates via USB CDC or DFU. No third-party drivers are required beyond standard OS USB serial support.

Can STEVAL-MKI109V3 power and evaluate non-ST MEMS sensors?

Yes - the board's DIL24 socket, programmable 0–3.6 V supply, and configurable I²C/SPI logic levels (via SN74AVC4T245RSVR and NTS0104GU12) allow interfacing with third-party MEMS devices that match the mechanical footprint and electrical signaling standards. However, Unico GUI features (e.g., auto-detection, calibration profiles) are optimized exclusively for ST sensors.

How is sensor supply current measured on this board?

Current is sensed using precision shunt resistors (e.g., 6.8 Ω, 0.1% tolerance) in series with VDD_DUT/VDDIO_DUT, amplified by TSZ122IQ2T op-amps in differential configuration. Gain is selected via AS21P2TLR digital potentiometers (RANGE_2x_A/B through RANGE_100x_A/B), and outputs feed the STM32F401VE's internal ADC channels with calibrated scaling for linear or logarithmic readout.

Does STEVAL-MKI109V3 support Bluetooth wireless data streaming?

Yes - it includes a dedicated UART interface (BT_TX/BT_RX, BT_RTS/BT_CTS, BT_RST) compatible with common 3.3 V Bluetooth modules (e.g., CSR BC04, TI CC2541). The STM32F401VE firmware can be modified to route sensor data over Bluetooth SPP or BLE profiles; however, no Bluetooth stack or preloaded firmware is included - users must implement or integrate their own protocol layer.