As smart wearable devices such as smartwatches, fitness trackers, and TWS earbuds continue to evolve toward longer battery life, smaller form factors, and richer functions, hardware designers face increasing challenges in power consumption and PCB space optimization.
As a critical timing component in wearable systems, the real-time clock (RTC) is responsible for timekeeping, scheduled wake-up, and time-based data management. Its power consumption, package size, and reliability directly affect device battery life, system integration, and the accuracy of health data records.
To meet the growing demand for low-power, highly integrated, and reliable RTC solutions in wearable electronics, YXC introduces the YSN8111 ultra-low power RTC with an integrated 32.768kHz crystal, providing an efficient time management solution for compact battery-powered devices.
Due to strict size limitations, wearable devices typically use small-capacity batteries ranging from tens to hundreds of mAh.
Even when the device enters sleep mode with the display turned off, the RTC must continue maintaining accurate time and supporting scheduled wake-up functions. Excessive standby power consumption can continuously drain the battery and reduce overall operating time.
Therefore, ultra-low power consumption is essential for extending wearable device battery life.
Modern wearable devices integrate multiple components, including sensors, wireless communication modules, and power management circuits, within extremely limited PCB space.
Traditional RTC solutions using an external RTC chip plus external crystal require additional PCB area and external components.
Moreover, external crystals may face reliability risks in environments involving sweat, humidity, or outdoor exposure, potentially causing oscillation failure or inaccurate timekeeping.
An integrated RTC solution can reduce external components while improving system reliability and design flexibility.
Wearable devices need to maintain accurate timestamps even during low battery conditions, power interruption, or battery replacement.
Accurate timekeeping is essential for applications such as step counting, heart rate monitoring, and sleep tracking, where recorded data must be correctly synchronized with timestamps.
Therefore, RTC devices require low backup voltage operation and automatic power source switching to ensure uninterrupted time retention.
Designed for battery-powered wearable applications, YXC's YSN8111 ultra-low power RTC integrates a 32.768kHz crystal, eliminating the need for an external crystal and matching capacitors.
By combining 250nA ultra-low power consumption, compact 3225 package, integrated crystal design, and automatic power switching, YSN8111 provides a highly efficient RTC solution for smartwatches, fitness trackers, TWS earbuds, and other portable devices.
With typical current consumption of only 250nA, YSN8111 significantly reduces RTC power consumption during standby operation.
For example, in a 300mAh smartwatch battery system, the RTC consumes approximately 2.2mAh per year, accounting for less than 1% of the total battery capacity.
This ultra-low power design helps minimize standby energy loss and extend overall device operating time.
YSN8111 integrates a 32.768kHz crystal inside the RTC package, eliminating external crystal components and reducing PCB layout requirements.
This highly integrated design provides several benefits:
The sealed integrated structure also helps avoid reliability issues associated with external crystals, such as moisture-induced leakage or oscillation failure.
YSN8111 supports a wide backup voltage range from 1.2V to 5.5V, allowing the RTC to maintain timekeeping even when the main battery voltage becomes extremely low.
The built-in automatic power switching circuit seamlessly switches between the main power supply and backup battery, ensuring uninterrupted RTC operation during power fluctuations or battery replacement.
Combined with timer and interrupt functions, YSN8111 enables low-power MCU wake-up operations, supporting continuous timestamp management for applications such as:
As wearable electronics continue evolving toward longer battery life, higher integration, and smarter functions, RTC devices have become more than simple timekeeping components. They are now critical elements affecting system power efficiency, PCB utilization, and data reliability.
With 250nA ultra-low power consumption, integrated crystal architecture, and reliable backup timekeeping capability, YXC YSN8111 provides an optimized RTC solution for smartwatches, fitness trackers, TWS earbuds, and other compact battery-powered devices.
