The DS3231 RTC Module is a high-precision real-time clock designed to keep accurate time and date even during power loss. Unlike basic RTC modules, it features an integrated temperature-compensated crystal oscillator (TCXO), delivering excellent accuracy without frequent recalibration. This makes it ideal for data loggers, IoT devices, automation systems, and industrial applications where long-term timekeeping reliability is critical.
Core Module Specifications
• RTC IC: DS3231
• Timekeeping: Seconds, minutes, hours, day, date, month, year
• Time Format: 12-hour / 24-hour selectable
• Accuracy: High precision with temperature compensation
Electrical & Interface
• Operating Voltage: 3.3 V – 5 V
• Communication Interface: I²C
• I²C Address: 0x68
• Interface Pins: VCC, GND, SDA, SCL
• Backup Power: CR2032 coin cell battery
Performance Characteristics
• Extremely low time drift
• Maintains time during power failure
• Automatic leap year compensation
• Integrated temperature sensor
Physical Characteristics
• Module Type: PCB-mounted RTC module
• Battery Holder: CR2032 coin cell slot
• Compact and durable design
• Clearly labeled pins for easy wiring
Compatibility
• Arduino Uno / Nano / Mega
• ESP8266 / ESP32
• STM32, AVR, PIC microcontrollers
• Raspberry Pi (I²C interface)
Key Advantages
• Much higher accuracy than DS1307
• No external crystal required
• Works with both 3.3 V and 5 V systems
• Excellent long-term stability
Technical Insights
• TCXO minimizes temperature-based drift
• Built-in alarms for scheduled interrupts
• Square-wave output available
• Ideal for precision time-stamping applications
Applications
• Data logging systems
• IoT and automation controllers
• Digital clocks and timers
• Industrial monitoring systems
• Embedded real-time scheduling
Pro Tip
• Insert the backup battery before setting time
• Disable square-wave output if not required
• Use pull-up resistors on SDA/SCL for reliable I²C
• Keep away from extreme heat sources
Package Includes
• 1 × DS3231 RTC Module