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Fermion: SD3031 RTC Module

SKU: DFR0998

This real-time clock(RTC) module employs the SD3031 chip with integrated crystal oscillator and temperature compensator, so it offers high-precision timing and stability. At 25℃, the accuracy remains at ±3.8ppm (±0.32832 seconds/day). The SD3031 can be powered by button cell batteries, which enables accurate timing even when the main power to the device is interrupted. The RTC keeps track of seconds, minutes, hours, day of the week, date of the month, month and year, and it automatically adjusts the date at the end of the month, including leap year corrections. Besides, SD3031 features built-in 70Byte SRAM for low-power data storage.

Front of Arduino RTC module with labeled pins and microcontroller chip-DFRobot product sku:DFR0998 image.

Downloadable Resources

  • Docs
  • Tech Specs

    • 1. Example Code for Arduino-Set and Read Time

    Run this routine, set the internal clock first, and then circularly get clock, temperature and voltage data. The temperature will update once every 60s when the module is powered by VCC and update once every 600s when powered by battery.

    2. Example Code for Arduino-RTC Clock Interrupt

    Run this routine, set internal clock and interrupt trigger first, interrupt will be triggered when the set time is reached. Countdown timer, schedule alarm and daily timed alarm can't be used at the same time.

    3. Example Code for Arduino-Countdown

    Run this routine to implement the countdown function.

    4. Example Code for Arduino-Read & Write SRAM

    Run this routine to read and write RAM data in the RTC module.

    5. Example Code for Arduino-32K Square Wave Output

    Run this routine to control pin 32K to output square wave.

    Reference

    This article is a comprehensive reference for the DFRobot_SD3031 library, offering detailed API descriptions for managing time and alarms in RTC modules.

    Specification

    Dimension drawing of DFR0998

    Parameter Value
    Supply Voltage 3.3V
    I2C Address 0×32
    SRAM 70 Byte (0x2C-0x71)
    Timing Range 2000 - 2099 year
    Operating Temperature -10℃ to +70℃
    Timing Accuracy ±3.8ppm @ 25℃
    Dimension 22.5×21mm/0.89×0.83"

    Pinout

    Appearance drawing of DFR0998

    Num Silkscreen Description
    1 VCC Power +
    2 GND Power -
    3 SCL I2C clock line
    4 SDA I2C data line
    5 INT Active-low interrupt or 1Hz square wave output
    6 NC NC
    7 32K 32.768KHz pulse output

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