EFR32SG28B322F1024IM48-A

Overview

The EFR32SG28B322F1024IM48-A is a dual-band wireless System-on-Chip (SoC) designed for Amazon Sidewalk applications. It integrates an ARM Cortex-M33 processor running at up to 78 MHz with 1024 kB of flash memory and 256 kB of RAM. The device features dual-frequency radio operation supporting Sub-GHz FSK and Bluetooth Low Energy. Key electrical specifications include a supply voltage range of 1.71 V to 3.8 V, maximum transmit power of +20 dBm at Sub-GHz frequencies, and receive sensitivity of -108.6 dBm at 50 kbps. It operates within a temperature range of -40°C to +125°C and utilizes a 48-QFN package.

Feature Summary

• Dual-band radio architecture supporting both Sub-GHz FSK and 2.4 GHz Bluetooth Low Energy protocols
• Integrated Secure Vault High security core for robust protection against remote and local attacks
• Optimized low-power performance suitable for battery-operated IoT devices with deep sleep current as low as 2.8 µA
• High-performance ARM Cortex-M33 processor with DSP and FPU capabilities

Applications

• Amazon Sidewalk compatible smart home devices
• Outdoor sensors including door, window, and temperature monitors
• Smart locks and access control systems
• Pet trackers and wearable health monitors

Procurement Notes

Verify the specific suffix 'A' in the part number to ensure compatibility with required manufacturing standards and regional regulatory certifications. Confirm that the 48-QFN package matches your PCB footprint design constraints. Check for any recent Product Change Notifications regarding assembly or labeling updates from Silicon Labs before finalizing procurement plans.

Selection Notes

Select this component when long-range connectivity via Sub-GHz is required alongside standard BLE functionality. It is ideal for applications needing extended coverage beyond typical 2.4 GHz limits, such as poolside or detached structure monitoring. Ensure the design supports the necessary antenna tuning for dual-band operation and leverages the integrated security features for data integrity.

Part Context

This SoC belongs to the EFR32xG28 family, which targets ultra-low power IoT applications. It complements other variants like the EFR32FG28 by offering specific optimizations for the Amazon Sidewalk ecosystem. The chip combines high computational efficiency with extensive peripheral interfaces, making it a versatile solution for complex wireless sensor nodes requiring both processing power and reliable long-range communication.

Replacement Considerations

Direct substitutes within the same series may include EFR32SG28 variants with different memory sizes or power output levels, such as those with 128 kB RAM or lower TX power. Cross-series replacements like the EFR32MG24 are possible but lack the specific Sub-GHz optimization and Sidewalk certification support inherent to the SG28 line.