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

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