A high-precision real-time clock (RTC) breakout board based on the DS3232 chip, featuring an integrated crystal resonator and temperature compensator. The DS3232 maintains accuracy of ±3.5ppm (±0.3 seconds/day) across the full operating range of -40°C to +85°C, making it ideal for applications that demand reliable, precise timekeeping.

The DS3232 integrates 236 bytes of battery-backed SRAM for data storage at extremely low power consumption, and maintains accurate timekeeping when main power is interrupted via a backup battery input. The module communicates over I2C and is compatible with 3.3V and 5V controllers.

Key Features

• ±3.5ppm Accuracy – ±0.3 seconds/day drift across -40°C to +85°C
• Integrated Crystal Resonator – No external crystal needed, with temperature compensation
• 236-Byte SRAM – Battery-backed storage for low-power data logging
• Battery Backup – Maintains timekeeping during power interruptions (CR1220 battery, not included)
• Two Programmable Alarms – Time-of-day alarm outputs
• Programmable Square Wave Output – Configurable frequency output
• 12/24 Hour Format – With AM/PM indicator in 12-hour mode
• Reset Pin – Can be used as a push-button input for microprocessor reset

Specifications

• Chip – DS3232
• Operating Voltage – 3.3–5.5V
• I2C Address – 0x68
• SRAM – 236 bytes (0x14–0x1F)
• Timing Range – 1970–2100
• Timing Accuracy – ±3.5ppm (±0.3 sec/day)
• Operating Temperature – -40°C to +85°C
• Board Dimensions – 22.5 × 21mm

Ideal For

• IoT data collection and timestamping
• MCU external wake-up source
• Precision clocks and alarm systems
• Low-power data logging with battery backup

Package Contents

• 1× Fermion DS3232 Precise RTC Breakout
• 1× 2.54mm 7-pin header

Resources

• Product Wiki (DFRobot)