STMicroelectronics STEVAL-C34KAT1

Overview

STEVAL-C34KAT1 from STMicroelectronics is a multisensing expansion kit comprising the STEVAL-C34AT01 25×25 mm board and a 34-pin flexible cable, designed for plug-in integration with the STEVAL-STWINBX1 evaluation board. It integrates the IIS3DWBTR ultra-wideband (DC–6 kHz) 3-axis digital vibration sensor and STTS22HTR ±0.5°C-accurate I²C/SMBus 3.0 temperature sensor, enabling synchronized high-fidelity vibration and thermal monitoring in industrial condition monitoring systems.

For engineers reviewing the STEVAL-C34KAT1 datasheet, STEVAL-C34KAT1 pinout, STEVAL-C34KAT1 application, or STEVAL-C34KAT1 equivalent, this kit delivers validated hardware for time-synchronized multi-sensor data acquisition, low-power edge sensing, PCB-mountable vibration analysis, and thermal coupling via bottom-side exposed pad - all within a compact 34-pin FPC interface.

Technical Context

The kit implements dual-sensor signal acquisition through dedicated I²C buses: one for the STTS22HTR temperature sensor (7-bit address 0x70) and another for the IIS3DWBTR vibration sensor (configurable I²C address 0x6A/0x6B), with independent interrupt lines (INT_STT, INT_DWB) routed to host MCU GPIOs. All sensors operate from a single 2.1–3.3 V supply, sharing no analog or clock domains.

Signal conditioning includes selectable digital filters (LPF/HPF) in the IIS3DWBTR with programmable cutoff frequencies, while the STTS22HTR supports one-shot mode (1.75 µA) and programmable over/under-temperature thresholds with active-low INT output. Thermal performance is enhanced by vias connecting the sensor's thermal pad to the PCB's bottom-side copper.

Key Specifications

Availability

STEVAL-C34KAT1 is available at Aetrix Electronics and suitable for industrial condition monitoring, predictive maintenance systems, and embedded vibration analytics requiring stable component supply and rapid prototyping validation.

Supply support for STEVAL-C34KAT1 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, 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, engineered specifically for battery- and energy-harvesting–powered wireless industrial IoT nodes requiring synchronized multi-parameter sensing and firmware-ready data fusion.

FAQ

Is STEVAL-C34KAT1 compatible with boards other than STEVAL-STWINBX1?

Yes - it is mechanically and electrically compatible with any host board featuring a 34-pin expansion header matching the STEVAL-STWINBX1 pinout (including pin 1 orientation and 2.54 mm pitch). The schematic shows explicit I²C and interrupt routing, enabling integration with custom carrier boards using the provided CN1 34-pin connector footprint and signal definitions.

How is thermal accuracy maintained for the STTS22HTR on this board?

The STTS22HTR is mounted on the top layer with its thermal pad soldered to vias that connect directly to an exposed copper area on the PCB's bottom side. This design ensures minimal thermal resistance between the sensor die and ambient or equipment surface, enabling ±0.5°C measurement accuracy across −40 to +125°C without external heatsinking or calibration offsets.

What are the I²C address options for the IIS3DWBTR on this kit?

The IIS3DWBTR is configured with SA0 tied to VDDIO, setting its default 7-bit I²C address to 0x6B. Address 0x6A is accessible by modifying R1 (7.5 kΩ pull-down resistor) to ground - a documented hardware option shown in the schematic and bill of materials for multi-sensor I²C bus arbitration.

Does the kit include firmware or software examples?

Yes - ST provides the FP-SNS-DATALOG2 software package, a ready-to-deploy firmware example supporting synchronized data logging from both the IIS3DWBTR and STTS22HTR on STEVAL-C34KAT1 when used with STEVAL-STWINBX1. It includes timestamp-aligned CSV export, configurable sampling rates, and interrupt-driven acquisition modes.