Silicon Labs SLWRB4502C

Overview

SLWRB4502C from Silicon Labs is a wireless MCU evaluation board built around the EZR32WG330F256R68G-C02 SoC - an ARM Cortex-M4-based sub-GHz wireless microcontroller with 256 kB flash, 32 kB RAM, integrated EZRadioPRO transceiver (142–1050 MHz), USB interface, and ultra-low-power operation down to 0.65 µA in Stop Mode. It enables rapid prototyping of battery-powered smart metering, building automation, and sensor network applications.

For engineers reviewing the SLWRB4502C datasheet, SLWRB4502C pinout, SLWRB4502C application, or SLWRB4502C equivalent, this page delivers verified hardware configuration details, RF performance metrics, energy mode behavior, peripheral routing constraints, and direct compatibility guidance with Simplicity Studio v4/v5 toolchain and Wireless Gecko SDK.

Technical Context

The SLWRB4502C implements the EZR32WG330F256R68G-C02 SoC in QFN64 package, featuring a 48 MHz ARM Cortex-M4 core with hardware AES-128/256 acceleration, 12-bit 1 Msps ADC, 12-bit 500 ksps DAC, dual op-amps, LESENSE for autonomous sensor monitoring, and dual LEUARTs for low-energy serial communication. Its radio subsystem uses EZRadioPRO R68 revision supporting +20 dBm output and –133 dBm sensitivity.

Board-level design integrates on-board antenna matching network, SMA RF connector, USB-to-UART bridge (CP2102N), debug interface via Segger J-Link OB, and configurable GPIO headers aligned to the SoC's 38-pin GPIO capability. Radio-MCU communication follows fixed USART0 (PE10–PE12) + IRQ (PE13) + PRS-routed GPIO0/GPIO1 (PA15/PE14) signaling per Table 3.1 of the EZR32WG330 datasheet Rev. 2.2.

Key Specifications

Availability

SLWRB4502C is available at Aetrix Electronics and suitable for smart utility metering, industrial sensor gateways, home security systems, and battery-powered IoT edge node development requiring stable component supply and long-term toolchain support.

Supply support for SLWRB4502C 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

Silicon Labs is a fabless semiconductor company specializing in secure, energy-efficient wireless and mixed-signal ICs for IoT, industrial, and infrastructure markets.

The EZR32WG family was designed specifically for sub-GHz wireless applications demanding high RF sensitivity, deep sleep current, and integrated security - targeting smart metering, building automation, and asset tracking where battery life and regulatory compliance are critical.

FAQ

What is the primary function of the SLWRB4502C evaluation board?

The SLWRB4502C is a fully assembled and tested evaluation platform for the EZR32WG330F256R68G-C02 wireless MCU. It provides immediate access to all SoC peripherals including USB, RF interface, GPIO headers, onboard debugger, and antenna path - enabling engineers to validate radio performance, run wireless protocol stacks, and develop firmware without custom PCB design. The SLWRB4502C ships pre-flashed with Simplicity Studio-compatible bootloader and reference firmware.

Does the SLWRB4502C support IEEE 802.15.4g and WM-Bus protocols out of the box?

Yes - the SLWRB4502C hosts the EZR32WG330F256R68G-C02 SoC, which is explicitly certified compliant with IEEE 802.15.4g and EN 13757-4 (WM-Bus) standards per its EZRadioPRO R68 transceiver implementation. Silicon Labs provides production-ready protocol stacks in the Wireless Gecko SDK, and Simplicity Studio includes preconfigured examples for both standards that run directly on the SLWRB4502C without hardware modification.

What are the key RF interface options available on the SLWRB4502C?

The SLWRB4502C offers two RF interface paths: (1) a 50 Ω SMA connector routed to the EZR32WG330's RF port through a calibrated matching network optimized for 868/915 MHz bands, and (2) a PCB trace antenna with RF switch for quick field testing. Both paths share the same EZRadioPRO R68 transceiver, supporting frequency range 142–1050 MHz, modulation schemes (G)FSK/(G)MSK/OOK, and data rates from 100 bps to 1 Mbps - all accessible via the same register map and Simplicity Studio Radio Configurator.

Can the SLWRB4502C be used for low-energy sensor node development?

Yes - the SLWRB4502C leverages the EZR32WG330F256R68G-C02's integrated Low Energy Sensor Interface (LESENSE), which operates autonomously in EM2 mode using only 32.768 kHz clocking. With support for up to 16 capacitive, resistive, or inductive sensors and built-in state machine logic, LESENSE enables wake-on-event sensing without CPU intervention. This capability is fully exposed on the SLWRB4502C via dedicated sensor header pins and documented in AN0051 and the LESENSE example project shipped with Simplicity Studio.

Is the SLWRB4502C still recommended for new designs?

No - the SLWRB4502C is based on the EZR32WG330F256R68G-C02, which Silicon Labs has marked "Not Recommended for New Designs" (Rev. 2.2 datasheet, p.2). While fully functional and supported by legacy Simplicity Studio v4/v5 toolchains, new projects should consider the EFR32MG21 or EFR32BG22 families for enhanced security, longer roadmap support, and improved RF performance. Aetrix Electronics maintains active inventory of SLWRB4502C for legacy maintenance, migration validation, and end-of-life transition support.