Compact real-time clock module featuring the ultra-precise DS3231 chip and onboard AT24C32 EEPROM. Ideal for data logging, time-stamping, and microcontroller projects with I²C support.

Specifications

• Operating Voltage: 3.3V – 5.5V
• Clock Chip: DS3231 (Temperature-Compensated RTC)
• Clock Accuracy: ±2ppm (approx. ±1 minute/month at 0–40°C)
• Temperature Sensor: ±3°C internal sensor
• EEPROM: AT24C32 (32K storage capacity)
• Interface: IIC/I²C bus, up to 400kHz
• Dimensions: 38mm × 22mm × 14mm
• Default EEPROM Address: 0x57 (modifiable via A0/A1/A2 pins)

Features

• Tracks seconds, minutes, hours, day, date, month, year (leap year aware till 2100)
• Dual alarm clock and programmable square-wave output
• Supports cascading with other I²C devices
• Ideal for Arduino, ESP32, STM32, and Raspberry Pi applications
• Battery-backed timekeeping with onboard coin cell holder

Important: Use only LIR2032 rechargeable battery. If using CR2032, disconnect the charging circuit to prevent damage.

Tutorial: DS3231 Precision RTC Module