STMicroelectronics STEVAL-MKI238A

Overview

STEVAL-MKI238A from STMicroelectronics is an adapter board for the LIS2DUX12 ultralow-power 3-axis smart accelerometer, providing full DIL24 socket compatibility, integrated decoupling capacitors (10 µF on VDD, 100 nF on VDDIO), and direct pinout access to all sensor signals including INT1, INT2, CS, SCL, SDA, SA0, and RES. It enables rapid prototyping in wearable and motion-sensing applications.

For engineers reviewing the STEVAL-MKI238A datasheet, STEVAL-MKI238A pinout, STEVAL-MKI238A application, or STEVAL-MKI238A equivalent, this board supports plug-and-play integration with STEVAL-MKI109D and X-NUCLEO-IKS4A1 platforms, MEMS Studio GUI operation, and custom firmware development via I²C/SPI interface routing.

Technical Context

The STEVAL-MKI238A implements a passive breakout architecture with no active logic or voltage translation - all LIS2DUX12 pins are routed 1:1 to a 24-pin dual-in-line header. Power delivery is segregated into VDD (1.71–3.6 V) and VDDIO (1.71–3.6 V), each with dedicated ceramic decoupling (10 µF + 100 nF).

Signal integrity is maintained through short trace lengths and ground plane isolation; interrupt outputs (INT1/INT2) are directly accessible, and the SA0 pin enables I²C address selection. No onboard level-shifting or signal conditioning circuitry is present - the board functions strictly as a mechanical and electrical interface extension.

Key Specifications

Availability

STEVAL-MKI238A is available at Aetrix Electronics and suitable for wearable motion sensing, industrial condition monitoring, and IoT edge node development requiring stable component supply and rapid sensor evaluation capability.

Supply support for STEVAL-MKI238A 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 components for industrial, automotive, and consumer markets.

This board belongs to ST's STEVAL evaluation platform family, engineered specifically to accelerate validation and integration of MEMS sensors - especially smart accelerometers with embedded AI and programmable finite state machines.

FAQ

Does STEVAL-MKI238A include a microcontroller or firmware?

No. The board contains no microcontroller, memory, or embedded firmware. It is a passive adapter that routes LIS2DUX12 signals to a DIL24 footprint. All processing, communication, and configuration must be handled by an external host (e.g., STEVAL-MKI109D or STM32 Nucleo via X-NUCLEO-IKS4A1).

Can STEVAL-MKI238A operate standalone without a host platform?

No. It lacks power regulation, clock generation, and communication interface circuitry. It requires connection to a compatible evaluation platform (e.g., STEVAL-MKI109D or X-NUCLEO-IKS4A1) or custom host system providing regulated VDD/VDDIO, I²C/SPI control, and interrupt handling.

What is the purpose of the JP1 12×2 header on the board?

JP1 is a 24-pin male header (12×2 layout) that replicates the LIS2DUX12's full pinout in DIL24 format. It allows direct solderless insertion into standard DIL24 sockets or mating with custom carrier boards, preserving signal order and pin numbering per ST's DB4900 schematic.

Is STEVAL-MKI238A RoHS compliant and REACH certified?

Yes. As stated in the official product description, STEVAL-MKI238A is RoHS compliant. STMicroelectronics certifies full compliance with Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006 for this board, with material declarations available upon request via ST's quality portal.