Silicon Labs, also known as the "core technology" division, has launched a new line of optical biometric sensors that offer advanced heart rate monitoring (HRM) and electrocardiogram (ECG) capabilities for wearable fitness and health devices. The Si117x sensor module stands out for its ultra-low power consumption, high sensitivity, and excellent integration, making it perfect for smartwatches, wristbands, patch-type devices, or other wearables that require long
Battery life and precise arrhythmia detection.
To speed up development and shorten time-to-market, Silicon Labs provides a complete sensing solution that includes the Si117x sensor module, heart rhythm algorithm, a Bluetooth-enabled Wireless Gecko SoC, and sample code, project examples, and an easy-to-use wrist development kit. This all-in-one package makes it simple for developers to integrate advanced biometric features into their designs.
The Si117x enhances rhythm measurement accuracy, delivering a better user experience. It offers fast sampling, a high signal-to-noise ratio (SNR > 100dB), and the ability to filter out ambient noise and erroneous data—ensuring reliable performance even with different skin tones, physiological variations, or tattoos. This leads to more accurate heart rate tracking and clearer ECG waveforms.
By combining ECG and optical HRM, the Si117x opens up new possibilities in biometric monitoring for wearables. As the gold standard for cardiac assessment, ECG is now accessible in a cost-effective way on wrist-worn devices. The sensor can simultaneously capture both ECG and photoplethysmogram (PPG) signals, allowing developers to extract more detailed physiological insights such as heart rate variability (HRV), stress levels, and pulse volume.
The Si117x supports Silicon Labs’ motion-compensated rhythm algorithm, optimized for wrist-based measurements and running on EFM32 Gecko MCUs and EFR32 Wireless Gecko SoCs with Bluetooth Low Energy support. This seamless integration enables efficient system-level power management and performance optimization, helping developers save time when adding heart rate monitoring to their wearable products.
In terms of availability, the Si117x sensor modules are already in mass production and come in a compact 3.7mm x 7mm, 28-pin LGA package. Silicon Labs also offers the Si118x optical biometric sensor chip, which integrates a photodiode in a small 3mm x 3mm QFN package. To help with development and testing, the company provides various wrist ECG and PPG development kits, a Bluetooth-enabled rhythm watch, and the Android-based Triple Heart app, which allows users to collect and analyze data from multiple devices.
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