DS1302 Real time Clock Module

The DS1302 is a low-power real-time clock module designed to keep accurate time in embedded projects. It integrates a clock/calendar that tracks seconds, minutes, hours, day, date, month, and year, with automatic leap-year compensation up to the year 2100. This module operates with a 3-wire serial interface (CE, I/O, SCLK) and can be easily connected to microcontrollers such as Arduino, ESP32, STM32, Raspberry Pi, and more.

Specification
RTC chip: DS1302  
Timekeeping: Seconds, minutes, hours (12/24 format), day, month, year
RAM: 31 bytes of user-accessible battery-backed RAM  
Battery backup: Supports a coin cell (CR2032) for keeping time when main power is off  
Operating voltage: Typically 2.0V – 5.5V (modules usually work with 5V and 3.3V systems)
Size(WxL): 23x44mm