As the adoption of wearable health monitors and smart devices continues to rise, the idea of "guardian angels" that track users' activities and health has become increasingly mainstream. According to market research firm CCSInsight, sales in the wearable category surged sixfold between 2014 and 2015, with projections indicating continued growth at a similar pace over the next three years. By 2018, sales are expected to surpass 170 million units, as illustrated in the figure below.
Sensing, Linking, and Power Management
What is fueling the rapid growth of advanced smart SoCs? Part of the answer lies in the rising health consciousness among consumers, who now seek more value from their wearable devices. However, future expansion will likely depend on how effectively these devices can deliver tangible benefits—especially in medical contexts. While the quality of data collected by wearables has reached a level that can be used by healthcare professionals, convenience remains a critical factor that is often overlooked. The real potential of these devices may still be underrealized, but ongoing innovations in sensors, communication protocols, and ultra-low-power technologies are making wearables more promising than ever.
Wearable devices are currently the fastest-growing segment within the Internet of Things (IoT) market. As they evolve, these devices are becoming more sophisticated, integrating multiple sensors and offering enhanced functionality. Industry experts believe the wearable market is still in its early stages, with the so-called "third-generation" devices expected to attract a broader audience. These next-gen wearables will be smarter, adapting to location, activity levels, and environmental conditions. More powerful sensors will generate richer data, enabling better insights into user behavior and health.
From basic motion sensors like 3D accelerometers, wearables have evolved to include pressure sensors, gyroscopes, and other advanced components. This integration allows devices to recognize specific activities such as running, cycling, or swimming. The trend continues, with newer models incorporating temperature sensors, humidity detectors, and more accurate heart rate monitors to provide comprehensive health tracking.
In the near future, we can expect more biosensors to be embedded in wearables, allowing for continuous monitoring of various physiological parameters throughout the day. Additionally, the inclusion of audio and visual sensors could enhance environmental awareness. For example, a microphone might detect background noise during a commute, triggering a drowsiness-monitoring mode, while insufficient ambient light could activate a sleep-friendly setting.
Such continuous monitoring raises an important challenge: power consumption. Most consumers prioritize battery life when purchasing portable devices, and wearables are no exception. Since these devices need to function continuously, their battery life must meet or exceed user expectations. This means third-generation wearables must operate for multiple days on a single charge, even as they incorporate more sensors and features.
To address this, manufacturers are exploring innovative power solutions, such as energy harvesting and wireless charging. Energy harvesting technologies—like solar panels, thermoelectric generators, and vibration-based systems—can capture small amounts of usable energy. Wireless charging, on the other hand, can harvest energy from ambient or directional radio waves, converting it into electricity. Both approaches show great promise and could become key drivers of the wearable market in the future. However, for now, rechargeable batteries remain the most practical solution, especially for compact devices that rely on wireless connectivity.
Loosely coupled wireless charging technology offers a convenient way to power wearables without requiring users to remove the device. This advancement not only improves usability but also enhances the overall user experience, paving the way for more seamless and intuitive wearable solutions.
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