Embedded World: Cortex-M33 Wireless MCUs for Bluetooth LE and Matter

Silicon Labs has announced an Arm Cortex-M33 based family of secured wireless microcontrollers covering Matter, OpenThread, Zigbee and Bluetooth LE.

SiLabs EFM32PG26 block

Called xG26, it consists of MG26 devices for Matter, OpenThread and Zigbee, BG26 devices for Bluetooth LE and Bluetooth Mesh, and PG26 devices for the same processing power without wireless transceivers.

“As users from consumer to industrial sectors extract more benefits from their IoT deployments, their requirements are steadily increasing,” said Silicon Labs CEO Matt Johnson.


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MG26 (EFR32MG26) MCUs have a 2.4GHz radio and a 78MHz Cortex-M33 with up to 3Mbyte of flash and 512kbyte of ram.

They have “headroom for Matter over Thread”, said the company. “Experience gained from working on Matter gave Silicon Labs insight into what it takes to build a device capable of growing with the needs of the Matter standard as it adds support for new device types, security enhancements, and more. Most device types have already seen Matter’s code requirements grow by 6% in the first 18 months since Matter 1.0 was released in October 2022.”

Also on-die are a matrix vector AI and machine-learning algorithm accelerator block, and security hardware.

“AI/ML acceleration enables up to 8x faster processing of machine learning algorithms using as little as 1/6th the power,” said Silicon Labs. Uisng its ‘custom part manufacturing service’, “xG26 devices can be hard-coded with customer-designed security keys and other features in the fabrication process, further hardening them against vulnerabilities”.

Applications are foreseen in gateways, hubs, LED lighting, switches, sensors, locks, glass break detection, predictive maintenance and wake-word detection.

BG26 (EFR32BG26) have a 2.4GHz radio and a 78MHz Cortex-M33 with up to 2Mbyte of flash and 256kbyte of ram, plus the AI accelerator and security hardware.

Target applications include gateways, hubs, sensors, switches, door locks, smart plugs, LED lighting, luminaires, blood glucose meters and pulse oximeters.

PG26 (EFM32PG26, pictured) foregoes the radio and has an 80MHz Cortex-M33 with up to 2Mbyte flash and 256kbyte ram, plus an LCD controller, the AI accelerator and security. Active (EM0 mode, 80MHz) consumption is 44.6μA/MHz and there is a 1.4μA deep sleep with 16kbyte ram retention and the real-time clock running.

Find Silicon Labs at Embedded World in Nuremberg today in hall 4A on stand 129, and the xG26 series on this web page.


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