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This miniature chip is being used in a saliva-monitoring sensor that attaches to your tooth [TechSpot]
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Silicon Labs says its xG27 family of Bluetooth SoCs comprises the BG27 and the BB50 microcontroller unit, both built on the ARM Cortex M33 processor and designed for the smallest of IoT devices. The former is primarily for Bluetooth connectivity, while the latter supports Zigbee and other proprietary protocols.