Keep Time Perfectly, Even When Power Fails

The DS3231 Real-Time Clock (RTC) Module is a highly accurate, temperature-compensated timekeeping solution designed for electronics projects that require precise and reliable tracking of time. With built-in battery backup, calendar functions, and an onboard temperature sensor, it keeps accurate time even when your system loses power.

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Why This Module Stands Out

• Ultra-Accurate Timekeeping: Features a temperature-compensated crystal oscillator (TCXO) for exceptional precision.

• Extremely Low Drift: Accuracy is typically around ±2 ppm at room temperature and remains stable across a wide temperature range.

• Battery Backup Support: Works with a coin-cell battery (such as CR2032) to retain time and date during power interruptions.

• Simple I2C Interface: Uses the standard SDA and SCL pins, making it extremely easy to connect to Arduino, ESP32, Raspberry Pi, and other microcontrollers.

• Wide Voltage Support: Operates in the range of approximately 2.3 V to 5.5 V, making it versatile for various projects.

• Two Programmable Alarms: Ideal for timed events, scheduled tasks, and automated reminders.

• Built-In Temperature Sensor: Offers digital temperature readings with solid accuracy, accessible directly via I2C.

• Automatic Calendar Management: Tracks seconds, minutes, hours, day, date, month, and year with built-in leap-year compensation up to the year 2100.

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Ideal Applications

• Data loggers and sensor-based systems

• Automation and IoT time scheduling

• Clock displays and alarm systems

• Battery-powered devices needing long-term timekeeping

• Timed relays, actuators, and switching systems

• Power-loss-prone systems requiring continuous time tracking

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Key Specifications

• Chip: DS3231

• Interface: I2C

• Operating Voltage: approx. 2.3 V – 5.5 V

• Accuracy: around ±2 ppm (0–40°C), ±3.5 ppm over extended temperatures

• Alarms: 2 programmable alarms + optional square-wave output

• Temperature Sensor Accuracy: approx. ±3°C

• Battery Backup: supports CR2032 or equivalent coin cell

• Operating Temperature Range: -40°C to +85°C

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Tips for Best Use

• Connect VCC, GND, SDA, and SCL correctly to your microcontroller.

• Insert a fresh CR2032 coin-cell battery to maintain the time during power-off periods.

• Use a standard RTC library to easily set and read time.

• Take advantage of the alarm features for automated tasks.

• Monitor the built-in temperature sensor for additional environmental data.

• If used in low-power designs, ensure your sleep modes keep the RTC powered or its backup battery active.

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Final Thought

The DS3231 RTC Module is one of the most reliable and precise timekeeping modules available for hobbyists, students, and engineering professionals. Its high accuracy, battery backup, programmable alarms, and easy I2C compatibility make it perfect for any project that needs dependable and long-lasting time tracking.