STMicroelectronics STEVAL-FKI433V1

Overview

STEVAL-FKI433V1 from STMicroelectronics is a sub-1 GHz transceiver development kit built around the S2-LP ultra-low-power narrowband RF transceiver and STM32L152RE Nucleo-64 MCU, operating in the 430–470 MHz ISM band with programmable +16 dBm output power, -130 dBm receiver sensitivity, and support for Wireless M-Bus systems.

For engineers reviewing the STEVAL-FKI433V1 datasheet, STEVAL-FKI433V1 pinout, STEVAL-FKI433V1 application, or STEVAL-FKI433V1 equivalent, this kit provides validated hardware, SPI-controlled S2-LP integration, USB interface, low-duty-cycle operation modes, and preloaded firmware for rapid evaluation of sub-GHz wireless protocols in utility metering and sensor networks.

Technical Context

The kit integrates two core subsystems: the S2-LP transceiver (QFN-24 package) configured for 430–470 MHz operation with 2-FSK/4-FSK/GFSK/OOK/ASK modulation and air data rates from 0.3 to 500 kbps, and the STM32L152RE MCU (LQFP-64) providing ARM Cortex-M3 control, integrated ST-LINK/V2-1 debugger, and low-power management for RF co-processing.

Hardware interconnect uses dedicated SPI (SCLK/SDI/SDO/CSN), GPIO control lines (GPIO0–GPIO3), and power domains including VDDSMPS, VDDANASYNTH, and VDDVCOTX; RF matching network components are tuned for 433 MHz center frequency with external crystal (Y1) and discrete LC filters.

Key Specifications

Availability

STEVAL-FKI433V1 is available at Aetrix Electronics and suitable for wireless utility metering, industrial sensor networking, and low-power IoT gateway prototyping requiring stable component supply, full-stack RF+MCU validation, and regulatory-compliant reference design reuse.

Supply support for STEVAL-FKI433V1 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 consumer applications.

This kit belongs to ST's STEVAL evaluation platform family, engineered to accelerate time-to-proof-of-concept for sub-GHz wireless systems targeting EN 13757-4 compliant metering and battery-operated remote monitoring.

FAQ

Does STEVAL-FKI433V1 support Wireless M-Bus mode T?

Yes. The S2-LP transceiver on this board natively supports all Wireless M-Bus physical layer modes per EN 13757-4, including mode T (169 MHz) and mode N (433 MHz). Firmware and GUI tools provided by ST include preconfigured mode T profiles, though the onboard RF front-end is optimized for 430–470 MHz operation and requires external antenna tuning for 169 MHz use.

Can the STM32L152RE be replaced with another Nucleo board?

No - the STEVAL-FKI433V1 motherboard is mechanically and electrically designed specifically for the NUCLEO-L152RE, including pin-mapped SPI, GPIO, and power connections to the S2-LP module. Replacing it with other Nucleo boards (e.g., NUCLEO-L476RG) would require hardware modification and firmware porting due to differences in GPIO mapping, clock tree, and peripheral register layout.

Is an external antenna required for RF testing?

Yes. The board includes an RF_IN/OUT connector (J1, U.FL type) and no onboard PCB antenna. A 433 MHz tuned external antenna (e.g., chip antenna or whip) must be connected via J1 to enable compliant RF performance testing; impedance matching is verified at 50 Ω with the provided schematic and layout.

What software tools are included with the kit?

ST provides the S2-LP GUI software, STM32CubeMX configuration tool, STM32CubeL1 firmware package (including S2-LP drivers and Wireless M-Bus examples), and full schematic/BOM documentation. No proprietary compiler or license is required - development is supported in Keil MDK, IAR EWARM, and GCC-based IDEs using standard CMSIS libraries.