DS3231 I²C Precision Real-Time Clock (RTC) Module

The DS3231 I²C Precision Real-Time Clock (RTC) Module provides highly accurate timekeeping and non-volatile memory for microcontroller projects. Built around the DS3231 temperature-compensated RTC chip, it maintains accurate date and time (seconds, minutes, hours, day, date, month, and year) even when the main power is off, thanks to its CR2032 battery backup.

An onboard AT24C32 32K EEPROM offers additional non-volatile storage for user data such as calibration values, sensor logs, or configuration settings. Its I²C interface ensures simple two-wire communication with Arduino, Raspberry Pi, ESP32, ESP8266, and other I²C-compatible boards.

🔹 Key Features

• Ultra-Precise Timekeeping: Temperature-compensated crystal oscillator (TCXO) provides ±2 ppm accuracy (~±1 minute per year).

• Battery Backup: Maintains timekeeping during power outages using a CR2032 coin cell.

• Integrated AT24C32 EEPROM: 32 Kbit (4 KB) of non-volatile memory for data storage.

• I²C Interface: Simple SDA/SCL connection compatible with Arduino Wire library and Raspberry Pi SMBus.

• Programmable Square-Wave Output: Configurable 1 Hz to 8 kHz output for timing signals.

• Wide Voltage Range: 3.3 V to 5.5 V, making it ideal for 3.3 V or 5 V logic systems.

• Compact Design: Easy to integrate on breadboards or custom PCBs.

🔹 Technical Specifications

• RTC Chip: DS3231

• EEPROM: AT24C32, 32 Kbit (4 KB)

• Operating Voltage: 3.3 V–5.5 V DC

• Communication Interface: I²C (SDA, SCL)

• Time Format: 24-hour or 12-hour with AM/PM

• Accuracy: ±2 ppm (0 °C to +40 °C)

• Battery Type: CR2032 (not included in some shipments)

• Operating Temperature: –40 °C to +85 °C

• Dimensions: ~38 mm × 22 mm × 14 mm

🔹 Applications & Use Cases

• Data Logging: Timestamp sensor readings in Electronics Components projects.

• IoT & Smart Devices: Maintain accurate scheduling for Arduino and Raspberry Pi projects.

• Automation & Robotics: Trigger events based on real-world time.

• Wearables & Portable Electronics: Low-power timekeeping in battery-operated devices.

• Home Automation: Timed control of lights, appliances, and security systems.

🔹 Advantages for Makers & Developers

• No external crystal or calibration required thanks to built-in temperature compensation.

• Compatible with popular Arduino libraries (RTClib, DS3231) and Raspberry Pi Python modules.

• Integrated EEPROM provides convenient data storage without extra components.

🔹 Safety & Precautions

• Insert the CR2032 battery with correct polarity before use.

• Avoid short circuits on SDA/SCL lines to protect the I²C bus.

• Use pull-up resistors on SDA and SCL if not already present on your microcontroller board.

🔗 Helpful Internal Links

• Browse Arduino and Accessories for compatible microcontrollers.

• Find soldering tools and accessories in Tools and Accessories.

🎥 Video Tutorial

[YouTube tutorial link here]

📝 Product Summary

The DS3231 I²C RTC Module with AT24C32 EEPROM delivers ultra-precise timekeeping and non-volatile memory for Arduino, Raspberry Pi, and IoT projects. Its battery backup, I²C interface, and integrated storage make it an essential component for data logging and automation systems.