DS3231 RTC Module – Real-Time Clock with Battery Backup (I2C Interface)

The DS3231 RTC Module is a highly accurate real-time clock that uses the I2C interface and includes a built-in temperature-compensated crystal oscillator and battery backup. It keeps track of seconds, minutes, hours, day, date, month, and year—even when the microcontroller is off.

With better accuracy than the DS1307, this module is perfect for applications like data logging, alarms, automation systems, clocks, and scheduling-based projects. The onboard CR2032 battery ensures it retains time even during power loss.

Whether you’re building a DIY clock, logging temperature or sensor data, or triggering timed events in your project, this module delivers stable and precise timekeeping.

Specifications:

• Chipset: DS3231 (temperature compensated)

• Communication: I2C interface

• Voltage: 3.3V to 5.5V compatible

• Battery: CR2032 (included)

• Accuracy: ±2ppm (±1 minute/year)

• Registers: Stores second, minute, hour, day, date, month, year

• Dimensions: Approx. 38mm x 22mm

• Additional Feature: Onboard EEPROM & temperature sensor (varies by module version)