DS3231S RTC Module with AT24C32 EEPROM — I2C, Arduino

DS3231S RTC Module with AT24C32 EEPROM — I2C, Arduino

The DS3231S RTC module combines a Maxim DS3231S temperature-compensated crystal RTC with an AT24C32 32Kbit EEPROM on a single I2C board. The DS3231S uses a temperature-compensated crystal oscillator (TCXO) for ±2ppm accuracy across the full temperature range — significantly more accurate than DS1307-based modules. Includes CR2032 battery backup.

Key Specifications

• RTC IC: DS3231S | Accuracy: ±2ppm (±1 min/year)
• Oscillator: Temperature-compensated crystal (TCXO)
• 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
• Compliance: RoHS compliant

Why Choose This?

• ✅ TCXO ±2ppm accuracy — stable across −40°C to +85°C temperature range
• ✅ 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
• Industrial time-keeping requiring temperature stability

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