EPSON real-time clock module RX8130CE can achieve backup power solution for intelligent door locks

Feb 11,2025
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As a pioneer of smart furniture, smart door locks have been widely popularized in thousands of households. With the increasing and complex functions of smart door locks, real-time clock circuits have been designed as an indispensable part of products to provide accurate clock sources.

In practical applications, accidents are everywhere, such as power outages due to internal or external forces. And smart door locks need to be able to reliably operate and record external temporary situations. In order to record the current status and abnormal event records in the event of an unexpected power outage, there must be a backup power system available for the MCU and real-time clock circuit to work for a short period of time.

In terms of circuit design, a backup power supply is required to provide backup power to both the MCU and the real-time clock circuit. Non rechargeable button batteries are often used as backup power sources. But there is an obvious drawback here, which is that manual maintenance is required after exhaustion, which is very inconvenient for smart door locks that are firmly installed on the door. Of course, other rechargeable energy storage solutions can also be adopted, but this requires the configuration of extremely complex peripheral circuits, which will significantly increase costs. How to achieve cheap and efficient backup power management to achieve abnormal response and recording of power failure in smart door locks is a major challenge for optimizing and improving such products.

As a leading provider of real-time clock module solutions in the industry, EPSON's RX8130CE real-time clock module can effectively address such application needs. With powerful packaging technology, the RX8130CE perfectly integrates high-precision 32.768kHz crystals, I2C control system, backup battery switching system, and other functional modules, enabling it to have both professional real-time clock module capabilities and unique backup power charging, discharging, and switching management functions.

The backup battery switching function of RX8130CE can be configured through the I2C interface, allowing for flexible setting of function switches and various parameters. It can be connected to external small lithium batteries or EDLCs through its VBAT pin, perfectly achieving charging and discharging management of backup power supply. When the main power supply is normal, it supplies power to the real-time clock module through VDD. If the backup power is not fully charged, it will be charged according to the set parameters until it reaches the specified voltage. When the main power suddenly disconnects, it automatically switches to the backup power supply internally, achieving seamless switching between the main and backup power, ensuring the stable and reliable operation of the real-time clock module.