STMicroelectronics STEVAL-C34KAT2

Overview

STEVAL-C34KAT2 from STMicroelectronics is a multisensing expansion kit comprising the STEVAL-C34AT02 board (25×25 mm) and a 34-pin flex cable, designed for plug-in use with the STEVAL-STWINBX1 evaluation board. It integrates the ISM330IS iNEMO inertial module (3-axis ±2/±4/±8/±16 g accelerometer + 3-axis ±125/±250/±500/±1000/±2000 dps gyroscope with embedded ISPU) and the STTS22H ultra-low-power temperature sensor (±0.5°C accuracy, −40 to +125°C, 1.75 µA one-shot mode), enabling edge AI motion and thermal sensing in industrial IoT nodes.

For engineers reviewing the STEVAL-C34KAT2 datasheet, STEVAL-C34KAT2 pinout, STEVAL-C34KAT2 application, or STEVAL-C34KAT2 equivalent, this kit supports high-speed datalogging, vibration analysis, factory automation monitoring, and ultrasound processing via STM32Cube function pack FP-SNS-DATALOG2 - with verified I²C/SMBus 3.0 interface compatibility, dual interrupt signaling (INT1/INT2), and thermal coupling through PCB-exposed pad.

Technical Context

The kit implements a dual-sensor architecture: the ISM330IS provides synchronized 6DoF motion data with programmable full-scale ranges and an embedded ISPU capable of executing C-coded signal processing and AI inference directly on-sensor, reducing host MCU load. Its high-performance mode draws 0.59 mA (accelerometer + gyroscope only); low-power mode draws 0.46 mA.

The STTS22H operates from 1.8–3.3 V, delivers 0.5°C accuracy over −40 to +125°C, and features programmable temperature thresholds with dedicated INT pin output. Thermal performance is enhanced by vias connecting the sensor to an exposed bottom-side copper pad.

Key Specifications

Availability

STEVAL-C34KAT2 is available at Aetrix Electronics and suitable for factory automation monitoring, industrial vibration analysis, edge AI sensor node development, and ultrasound-based condition monitoring requiring stable component supply and rapid prototyping support.

Supply support for STEVAL-C34KAT2 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 devices for industrial, automotive, and consumer applications.

This kit belongs to ST's STWIN (Smart Sensor Node) ecosystem and was developed to accelerate development of intelligent, battery-efficient industrial IoT edge nodes with integrated motion, thermal, and AI processing capabilities.

FAQ

Is STEVAL-C34KAT2 compatible with boards other than STEVAL-STWINBX1?

Yes - while optimized for plug-in use with STEVAL-STWINBX1, the 34-pin expansion interface follows STWIN standard pin mapping and is electrically compatible with any host board supporting I²C/SPI and 1.8–3.3 V logic levels, including custom STM32-based carrier boards. Mechanical mounting uses four holes or double-sided tape.

Does the ISPU on ISM330IS require proprietary toolchains?

No - the ISPU supports standard C programming via ST's X-CUBE-ISPU firmware package and integrates with popular IDEs including STM32CubeIDE. Development leverages open libraries for filter design, feature extraction, and ML model deployment without vendor-locked compilers or debuggers.

How is temperature accuracy maintained during motion sensing?

The STTS22H is physically isolated from the ISM330IS and mounted on the opposite side of the PCB, with thermal vias routing heat to an exposed bottom copper pad. This decouples self-heating effects from the inertial sensor and ensures stable ±0.5°C accuracy even during sustained high-performance motion sampling.

Can both ISM330IS and STTS22H operate simultaneously on shared I²C bus?

Yes - both sensors use standard I²C with non-overlapping default addresses (ISM330IS: 0x6B, STTS22H: 0x48) and support SMBus 3.0 timing. No arbitration or bus contention occurs; they can be polled or configured for interrupt-driven operation independently on the same bus.