The DS1302 is a real-time clock (RTC) module used to keep track of the current time and date, even when the system power is turned off. It’s commonly used in embedded systems, Arduino projects, and other microcontroller applications that require timekeeping functionality.

Features of the DS1302 RTC Module:

1. Real-Time Clock: Keeps track of seconds, minutes, hours, day, month, and year.
2. Battery Backup: The module uses a coin-cell battery (typically CR2032) to maintain time when the main power supply is off.
3. Low Power Consumption: It draws minimal current, especially in battery-backed mode.
4. Serial Communication: Communicates with microcontrollers (e.g., Arduino, Raspberry Pi) via a 3-wire interface: SCLK (Serial Clock), I/O (Data Input/Output), and CE (Chip Enable).
5. Alarm Function: Can be used to set alarms (though not as common in basic RTC use).
6. Easy to Use: Compatible with 3.3V or 5V logic systems.

Pinout of DS1302 Module:

DS1302 Real Time Clock (RTC) Module With Battery