The DS3231 is a low-cost, extremely accurate I2C real-time clock. It is the gold standard for projects where time drift is unacceptable. Because it uses a temperature-compensated crystal oscillator (TCXO), it maintains perfect time even when the environment temperature changes. Its the perfect component for alarm clocks, time-stamping sensor data, or automating lights and equipment.
Incredible Accuracy: Accurate to $\pm 2$ ppm from 0^Cto +40^C.
Battery Backup: Features a holder for a CR2032 battery, ensuring your project remembers the time even during a power outage or when the microcontroller is disconnected.
Easy Interface: Uses the standard I2C (2-wire) protocol, making it compatible with almost any microcontroller (Arduino, ESP32, STM32, Raspberry Pi).
Dual Alarms: Includes two programmable time-of-day alarms and a programmable square-wave output.
Integrated Sensor: Includes an onboard digital temperature sensor for additional monitoring.
| Feature | Specification |
| Model | DS3231 (TCXO) |
| Interface | I2C (SDA, SCL) |
| Voltage | 2.3V 5.5V |
| Memory | Integrated AT24C32 EEPROM (32K) |
| Battery Type | CR2032 (Not included) |
| Accuracy | pm 2ppm (approx. 1 minute per year) |
Digital Clocks: Build a clock that never needs resetting.
Data Loggers: Time-stamp your environmental sensor data (e.g., Temperature, Humidity).
Smart Home Automation: Schedule your relay modules to trigger at specific times of the day.
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