STMicroelectronics STEVAL-FKI433V2

Overview

STEVAL-FKI433V2 from STMicroelectronics is a sub-1GHz wireless M-Bus evaluation kit integrating the S2-LP transceiver (430–470 MHz), STM32L053R8 MCU, and ST-LINK/V2-1 debugger. It supports 2-FSK/4-FSK/OOK modulation, up to +16 dBm RF output, -130 dBm sensitivity, and SPI/USB interfaces for rapid prototyping of utility metering systems.

For engineers reviewing the STEVAL-FKI433V2 datasheet, STEVAL-FKI433V2 pinout, STEVAL-FKI433V2 application, or STEVAL-FKI433V2 equivalent, this board delivers validated RF-MCU co-design, low-duty-cycle operation, protocol engine support (ACK/retransmission), and out-of-box firmware for wireless M-Bus Class C/C1 endpoints.

Technical Context

The board implements a complete, pre-tuned 430–470 MHz ISM-band RF subsystem using the S2-LP transceiver with integrated VCO, TCXO enable control, and matching network optimized for SMA antenna connection. The STM32L053R8 provides ultra-low-power execution (down to 0.29 µA in standby) and manages RF configuration, packet handling, and USB-to-SPI bridging.

Hardware-level protocol acceleration includes automatic ACK generation, retransmission on timeout, and CRC-16 validation - all handled by the S2-LP's embedded packet engine without MCU intervention. Power management supports SMPS-controlled VDDSMPS and independent analog/digital supply domains for RX/TX optimization.

Key Specifications

Availability

STEVAL-FKI433V2 is available at Aetrix Electronics and suitable for wireless M-Bus metering, smart utility endpoint development, and sub-GHz IoT sensor node validation requiring stable component supply and regulatory-ready RF design.

Supply support for STEVAL-FKI433V2 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, analog ICs, power devices, and sensors for industrial, automotive, and IoT applications.

The STEVAL-FKI433V2 belongs to ST's wireless connectivity evaluation platform family, engineered specifically to accelerate EN 13757-4 wireless M-Bus system development with certified RF performance and reference firmware.

FAQ

Does STEVAL-FKI433V2 support over-the-air firmware updates?

Yes - it supports USB-based firmware updates via the integrated ST-LINK/V2-1 debugger. The STM32L053R8 MCU exposes a DFU (Device Firmware Upgrade) interface compatible with ST's STM32CubeProgrammer, enabling field updates without external tools or JTAG probes.

Can STEVAL-FKI433V2 operate in WMBus Mode N or T?

Yes - the S2-LP transceiver and bundled firmware fully support WMBus Modes N (narrowband, 169 MHz) and T (868 MHz), but STEVAL-FKI433V2's hardware is tuned exclusively for 430–470 MHz. For Mode N/T, ST recommends STEVAL-FKI868V2 or STEVAL-FKI169V2.

Is an external antenna required?

No - the board includes a 50 Ω SMA connector and matching network calibrated for standard 433 MHz monopole or dipole antennas. An external antenna is optional and recommended for extended range; onboard PCB trace antenna is not provided.

What software tools are included with STEVAL-FKI433V2?

ST provides the S2-LP GUI software, STM32CubeMX project templates, S2-LP firmware libraries (including WMBus stack), and AN4717 application note. All are downloadable from st.com under product page STEVAL-FKI433V2, with no license fee or registration required.