DS3231 Precision I2C RTC Module with AT24C32 EEPROM (High-Accuracy Real-Time Clock, Without Battery)

Keep flawless time in your embedded systems with the DS3231 Precision I2C RTC Module. Driven by an internal temperature-compensated crystal oscillator (TCXO), this premium real-time clock chip maintains a microscopic ±2ppm accuracy margin (under 1 minute of deviation per year). Paired with an onboard AT24C32 32Kbit EEPROM storage chip, it handles seconds, minutes, hours, calendar data, and user logs over a standard I2C interface—making it the ultimate timekeeping breakout for data loggers, automated timers, and smart scheduling arrays. (Note: Battery cell is not included).

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Tags DS3231 RTC Module Precision Real Time Clock AT24C32 EEPROM High Accuracy RTC I2C Clock Module Arduino RTC Sensor DS3231 Arduino Data Logger Clock Real Time Clock Board DS3231 No Battery.

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Product Details :

The DS3231 Precision I2C RTC Module is a low-power, ultra-precise timekeeping hardware assembly engineered to eliminate the clock drift problems that plague standard quartz crystals. Standard clock crystals are highly sensitive to external temperature changes, which leads to cumulative timing errors over weeks or months. The DS3231 solves this issue by integrating a Temperature-Compensated Crystal Oscillator (TCXO) directly into its silicon package. An internal temperature sensor continually tracks environmental variations and automatically scales the internal tuning capacitors to ensure rock-solid timing accuracy.

To maximize its utility in industrial data logging applications, this module also embeds an AT24C32 32Kbit Serial EEPROM memory chip. This non-volatile storage chip shares the exact same 2-wire I2C communication bus, allowing you to log system event time stamps, calibration vectors, or schedule registers without taking up any extra pins on your microcontroller. The board includes a dedicated coin-cell retaining slot on the underside, ready to accept a backup cell to ensure your timing data remains completely safe during main system power blackouts.

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: Automatically processes seconds, minutes, hours, day of the week, numerical date, month, and year data, complete with native leap-year compensation valid up to the year 2100.
Dual Programmable Calendar Alarms: Features two fully configurable alarms with an internal hardware interrupt output pin (SQW/INT), allowing the module to wake up sleeping microcontrollers from deep-sleep modes at precise times.
Pre-wired Pull-up Resistors: Comes assembled with 4.7kΩ pull-up resistors on both the Serial Data (SDA) and Serial Clock (SCL) communication lines, ensuring reliable I2C bus performance straight out of the box.

Technical Specifications

Feature	Specification
Core Clock IC	Maxim Integrated DS3231 (With Built-in TCXO)
Onboard Auxiliary Memory	AT24C32 32Kbit (4K x 8-bit) Serial I2C EEPROM
Communication Protocol	Two-Wire I2C Interface (Shared Address Bus topology)
Timing Precision Margin	± 2 ppm (± 0.17 Seconds per Day deviation limits)
Operating Voltage Window	+3.3 V to +5.5 V DC

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:

Connect VCC, GND, SDA, and SCL to your development board.
Insert a compatible coin cell battery if you want the module to remember the time when powered off.
Install an open-source library (such as the RTClib or DS3231 library) in your development environment.
Run the initialization script once to sync the RTC module with your computer's current compile time (rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));).
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 Precision I2C RTC Module with AT24C32 EEPROM (Battery Not Included)
1 x 6-Pin Right-Angle Male Header strip

Shipping & Delivery

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