DS3231 RTC Module – High-Precision Real Time Clock with AT24C02 EEPROM, I2C Interface for Arduino, ESP32, Raspberry Pi & Electronics Projects

Technical Specifications

• RTC Chip: DS3231 (Temperature-Compensated Real Time Clock)
• EEPROM: AT24C02 (2Kb I2C EEPROM)
• Interface: I2C (SDA, SCL)
• Operating Voltage: 3.3V – 5V
• Accuracy: ±2 ppm (±1 minute per year)
• Temperature Range: -40°C to +85°C
• Battery Backup: CR2032 coin cell support (ensures timekeeping during power loss)
• Square Wave Output: 1Hz, 1kHz, 4kHz, 8kHz (SQW pin)
• Data Retention: > 10 years (with backup battery)
• Memory Capacity: 256 bytes (AT24C02)
• Communication Protocol: I2C (400 kHz Fast Mode supported)
• Applications: Clocks, timers, data loggers, IoT devices, real-time tracking, automation, embedded systems

Technical Descriptions

The DS3231 RTC Module is a high-precision, temperature-compensated real-time clock designed for accurate timekeeping in electronics and embedded applications. Unlike traditional RTC modules, the DS3231 maintains exceptional accuracy (±2 ppm) thanks to its built-in temperature-compensated crystal oscillator.

This module includes an onboard AT24C02 2Kb EEPROM, allowing you to store configuration settings, device logs, timestamps, and user data. With its I2C interface, the DS3231 works seamlessly with Arduino, ESP8266, ESP32, Raspberry Pi, STM32, and other microcontrollers.

The onboard CR2032 battery holder ensures that the module keeps accurate time even when the main power is disconnected—making it ideal for data loggers, IoT systems, clocks, alarms, automation devices, and tracking applications.

Compact, reliable, and easy to integrate, this DS3231 module is the perfect timing solution for both hobbyists and engineers.