DS3231 AT24C32 I2C High‑Precision Real‑Time Clock Module for Arduino

Product Description

The DS3231 module offers high accuracy and reliability while saving development time. It includes several advanced features that extend the capabilities of the host system. The device integrates a highly accurate digital temperature sensor, accessible through the I2C interface. The temperature sensor has an accuracy of ±3 °C.

The onboard power‑management circuitry automatically detects and switches between the main power supply and the backup battery (low‑voltage standby). If the main power is interrupted, the module continues to keep accurate time and temperature readings without performance loss.

Module Specifications

1. Dimensions: 38 mm (L) × 22 mm (W) × 14 mm (H)

2. Weight: 8 g

3. Operating Voltage: 3.3 V to 5.0 V

4. Clock Chip: High‑precision DS3231 RTC

5. Clock Accuracy: 2 ppm (approx. ±1 minute per year) within the 0–40 °C range

6. Two programmable alarms

7. Programmable square‑wave output

8. Real‑time clock provides: seconds, minutes, hours, day, date, month, and year, with leap‑year compensation valid until 2100

9. Built‑in temperature sensor: ±3 °C accuracy

10. Memory Chip: AT24C32 EEPROM (32 Kbit storage capacity)

11. I2C interface: up to 400 kHz transfer speed (5 V‑tolerant)

12. I2C cascading supported: AT24C32 address can be changed via A0/A1/A2 jumpers (default address: 0x57