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The DS3231 High-Precision I2C RTC Memory Module is a low-cost, ultra-precise timekeeping solution designed to eliminate the long-term cumulative errors that compromise standard quartz crystals. Standard clock crystals are highly sensitive to external temperature variations, leading to noticeable timing drift over weeks or months. The DS3231 solves this issue by integrating a Temperature-Compensated Crystal Oscillator (TCXO) directly into its silicon gates. An internal 10-bit temperature sensor continually monitors ambient conditions and automatically adjusts the oscillator tuning to guarantee rock-solid accuracy.

To maximize utility for datalogging and telemetry networks, the module also incorporates an AT24C32 32Kbit Serial EEPROM non-volatile memory chip. The memory and clock chips share the exact same 2-wire fast I2C communication bus (400kHz), meaning you can store time-stamped system event logs, sensor trends, or calibration arrays without using up any additional pins on your microcontroller. The board features an integrated battery holder on the bottom side, enabling continuous timekeeping backup whenever the primary system power drops out.

Key Features & Benefits:

• Uncompromising Industrial Accuracy: Operates at a precise ±2ppm rating across a 0°C to +40°C window, ensuring less than 60 seconds of cumulative timing deviation over an entire year.

• Full-Featured Calendar Engine: Manages seconds, minutes, hours, day of the week, date, month, and year data automatically, including leap-year compensation valid all the way up to the year 2100.

• Dual Programmable Alarms: Outfitted with two independent daily alarms and an internal hardware interrupt output pin (SQW/INT) that can wake up sleeping microcontrollers from deep-sleep modes.

• Configurable I2C Memory Addressing: Features surface-mount solder jumpers (A0, A1, A2) on the PCB to adjust the hardware slave address of the EEPROM, avoiding address collisions on complex shared buses.

Technical Specifications

How to Use

The DS3231 RTC Module communicates via a standard 2-wire I2C interface. It is highly superior to the older DS1307 RTC, which easily loses accuracy when ambient temperatures fluctuate.

Pinout Configuration:

• VCC: Connect to 3.3V or 5V DC power supply.

• GND: Connect to common system ground.

• SCL: I2C Clock Line (Connect to microcontroller's SCL pin).

• SDA: I2C Data Line (Connect to microcontroller's SDA pin).

• SQW: Square Wave / Interrupt Output (Optional; used for hardware interrupts or external clock syncing).

• 32K: Outputs a stable 32.768kHz clock signal directly from the TCXO (Optional).

Basic Setup Steps:

1. Connect VCC, GND, SDA, and SCL to your development board.

2. Insert a compatible coin cell battery if you want the module to remember the time when powered off.

3. Install an open-source library (such as the RTClib or DS3231 library) in your development environment.

4. Run the initialization script once to sync the RTC module with your computer's current compile time.

5. Read time values seamlessly in real-time and display them via the Serial Monitor or an external LCD screen.

Common Applications

Because of its exceptional accuracy and onboard storage, this real-time clock module is heavily utilized in time-sensitive electronics:

• Data Loggers & Weather Stations: Timestamping sensor readings (temperature, pressure, humidity) accurately to flash memory or SD cards.

• Automated Scheduling Systems: Controlling relays for automated plant watering systems, school bells, or street lighting timers.

• Attendance Systems: Logging exact check-in and check-out data for biometric or RFID-based access control gates.

• Smart Energy Meters: Tracking utility usage metrics across specific peak and off-peak hour intervals.

• Digital Wall Clocks & Timers: Creating highly precise, standalone household clocks that do not require network internet syncing.

Package Includes

• 1 x DS3231 High-Precision I2C RTC Memory Module with AT24C32 EEPROM

• 1 x 6-Pin Right-Angle Male Header strip

Shipping & Delivery

At Electroboat Technologies, we focus on safe transport and rapid logistics for all your advanced development hardware.

• Free Shipping: Enjoy Free Shipping on all orders above ₹999 across India.

• Dispatch Time: Your order will be carefully packed and dispatched within 1-3 business days.

• Estimated Delivery: Expect your package at your doorstep within 3-7 business days (depending on your specific location).

• Secure Packaging: We use specialized anti-static and cushioned packaging to ensure total safety and safe transit of all your sensitive electronic components.