RTC DS3231 Real Time Clock I2C Module(Real-Time Clock)

High-Precision DS3231 I2C Real-Time Clock (RTC) Module

Keep flawless time on your microcontrollers even when disconnected from mains power. The DS3231 is an ultra-accurate I2C Real-Time Clock that features an integrated temperature-compensated crystal oscillator (TCXO). By housing the crystal inside the chip itself and tuning it against temperature changes, this module guarantees long-term timekeeping precision while lowering your project's overall component count.

Key Capabilities

• Complete Time & Calendar Tracking: Tracks seconds, minutes, hours, day, date, month, and year with full leap-year compensation valid up to the year 2100. It supports both 24-hour and 12-hour (with AM/PM indicators) formats.

• Dual Alarms & Outputs: Features two programmable calendar alarms alongside a configurable square-wave output signal.

• Power-Failure Resilience: An onboard voltage reference and comparator circuit constantly monitor your main VCC line. If it drops, the board automatically shifts to its battery backup, triggering a reset output if needed. The /RST pin can also be toggled manually for microprocessor resets.

• Integrated Digital Thermometer: Includes an onboard digital temperature sensor accessible over the same I2C bus, featuring an accuracy profile of ±3°C.

• Extended Backup Performance: Timekeeping and temperature readings remain uninterrupted during a primary power failure. Once main power returns, the module assists in smoothly restarting your host microcontroller.

Technical Specifications

• Dimensions: 38mm x 22mm x 14mm

• Weight: 8g

• Operating Voltage: 3.3V to 5.5V

• Core Controller: High-accuracy DS3231 RTC IC

• Timing Accuracy: ±2ppm across a 0°C to 40°C threshold (translates to roughly a 1-minute variance per year)

• Onboard Memory: AT24C32 EEPROM chip providing 32K of extra storage space

• Bus Communication: I2C interface running at speeds up to 400kHz (optimized at 5V)

• Expandable Address Routing: Devices can easily be daisy-chained on the same line. The default EEPROM address is 0x57, but it can be changed manually using the A0, A1, and A2 solder jumpers.

• Backup Power: Utilizes a standard CR2032 coin cell battery to preserve internal registers during a system shutdown.