DS3231M RTC Module with AT24C32 EEPROM — I2C, Arduino

DS3231M RTC Module with AT24C32 EEPROM — I2C, Arduino

The DS3231M RTC module combines a Maxim DS3231M MEMS real-time clock with an AT24C32 32Kbit EEPROM on a single I2C board. The DS3231M uses an integrated MEMS resonator — no external crystal needed — with ±2ppm accuracy (±1 minute/year). Includes a CR2032 battery backup to maintain time when main power is off.

Key Specifications

• RTC IC: DS3231M | Accuracy: ±2ppm (±1 min/year)
• EEPROM: AT24C32 (32Kbit / 4KB)
• Interface: I2C (0x68 RTC / 0x57 EEPROM)
• Battery: CR2032 backup | Supply: 3.3–5V
• Temperature sensor: ±3°C accuracy
• Alarms: 2 programmable alarms | SQW output: 1Hz / 4kHz / 8kHz / 32kHz
• Compliance: RoHS compliant

Why Choose This?

• ✅ ±2ppm MEMS accuracy — no crystal drift, more stable than DS1307
• ✅ AT24C32 EEPROM — store configuration data and timestamps
• ✅ Battery backup — maintains time through power outages
• ✅ RTClib compatible — extensive Arduino community support

Typical Applications

• Arduino clock and calendar projects
• Data logger timestamp recording
• Scheduled automation and alarm systems
• IoT time synchronization backup

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