BUY PCF8563T https://www.utsource.net/itm/p/11252740.html

Description: The PCF8563T is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption. Features: Low power consumption I2C-bus interface Programmable clock-out frequency Programmable timer Automatic power-fail detect and switch Battery switch-over Clock/calendar in BCD format Alarm function Interrupt output Operating voltage range: 2.0V to 5.5V Operating temperature range: -40°C to +85°C Applications: Automotive Industrial Home appliances Wearable devices Smart home Security systems Medical devices Networking equipment Portable devices (For reference only)