STMicroelectronics STEVAL-MKI109V2

Overview

STEVAL-MKI109V2 from STMicroelectronics is a MEMS evaluation motherboard built around the STM32F103RET6 32-bit ARM Cortex-M3 microcontroller, featuring a DIL24 socket for plug-and-play connection to all ST MEMS adapter boards (e.g., accelerometers, gyroscopes, pressure sensors), on-board 3 V linear regulator, USB 2.0 full-speed interface, and SWD/JTAG debugging support - enabling rapid sensor characterization and GUI-driven development.

For engineers reviewing the STEVAL-MKI109V2 datasheet, STEVAL-MKI109V2 pinout, STEVAL-MKI109V2 application, or STEVAL-MKI109V2 equivalent, this board serves as a standardized host platform for evaluating analog/digital-output ST MEMS devices, supporting firmware updates via DFU mode, real-time sensor data streaming over USB, and custom software integration through STM32 HAL libraries and ST's eMotion software suite.

Technical Context

The motherboard implements a fixed-architecture bridge system: the STM32F103RET6 runs preloaded firmware that configures its SPI/I²C/ADC peripherals to communicate with attached MEMS adapters, routes sensor data to PC via CDC ACM USB virtual COM port, and exposes GPIOs for interrupt handling (INT1/INT2) and power control (VDD_DUT).

Hardware-level signal conditioning includes dual TS924 quad op-amps for analog output buffering and level-shifting, TS922 dual op-amps for reference voltage (Vref) and LED driver circuits, and configurable jumpers (JP2–JP3) to select between SPI and I²C communication protocols with MEMS devices.

Key Specifications

Availability

STEVAL-MKI109V2 is available at Aetrix Electronics and suitable for MEMS sensor evaluation, industrial condition monitoring prototyping, and academic IoT lab setups requiring stable component supply, consistent firmware baseline, and documented hardware interoperability with ST's full MEMS adapter ecosystem.

Supply support for STEVAL-MKI109V2 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, Switzerland, designing and manufacturing microcontrollers, MEMS sensors, power management ICs, and automotive-grade components for industrial, consumer, and automotive markets.

The STEVAL-MKI109V2 belongs to ST's eMotion™ evaluation platform family, engineered specifically to accelerate time-to-proof-of-concept for ST's MEMS motion sensors by providing standardized host hardware, validated firmware, and GUI-based data visualization tools.

FAQ

Does STEVAL-MKI109V2 support both digital and analog-output MEMS adapters?

Yes. The DIL24 socket provides dedicated pins for SPI, I²C, analog outputs (OUT1–OUT6), interrupt signals (INT1/INT2), and reference voltage (Vref), enabling direct connection to ST's full range of digital (e.g., LIS3DH) and analog-output (e.g., LPS25HB, LSM303DLHC) MEMS adapters without hardware modification.

What firmware options are available for the STM32F103RET6 on this board?

The board ships with factory-programmed firmware supporting USB CDC ACM communication and basic sensor initialization. ST provides open-source firmware examples on GitHub (stsw-mems001) for custom applications, including raw data streaming, FFT processing, and sensor fusion - all compatible with the board's pin mapping and peripheral configuration.

Can STEVAL-MKI109V2 be used without the ST eMotion GUI?

Yes. The board enumerates as a standard USB CDC ACM device; users can develop custom host applications (Python, C#, MATLAB) to read sensor data via serial port, parse ASCII or binary packet formats, and implement domain-specific algorithms - independent of ST's proprietary GUI.

Is the 16 MHz crystal oscillator on J1 required for all MEMS adapter configurations?

Yes. The 16 MHz crystal (Osc1) is the primary clock source for the STM32F103RET6 and must be populated for stable MCU operation. While some MEMS adapters use internal clocks, the motherboard's timing-critical USB and ADC functions depend on this oscillator; removal disables core functionality.