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Fermion: DS3231M MEMS Precise RTC Module

SKU: DFR0641

This article delves into the Fermion: DS3231M MEMS Precise RTC Module, showcasing its design which integrates a MEMS resonator and temperature compensator to offer enhanced accuracy and reliability compared to quartz crystal clocks, particularly in high-vibration environments. Certified by ACE-Q100, it withstands rigorous shock and vibration tests, ensuring durability with a mechanical shock resistance of 2900g and 20g variable frequency vibration tolerance. Powered by a coin cell battery, the module maintains accurate timing even without mains power, providing comprehensive time data and automatic adjustments for month-end dates and leap years. With versatile clock formats, programmable calendar alarms, and a square wave output, the DS3231M also features a RST pin for microprocessor reset, making it an indispensable tool for precise timekeeping and system management in challenging conditions.

Front of DS3231M MEMS RTC breakout module with labeled pins and black background.-DFRobot product sku:DFR0641 image.

Downloadable Resources

  • Docs
  • Tech Specs
    • 1. Example Code for Arduino-Alarm Trigger Interrupt

    This blog post provides a step-by-step guide on setting up an alarm trigger interrupt on Arduino using the DS3231M RTC module. It covers hardware and software preparation, wiring diagrams, and sample code to implement precise alarm functionalities, making it ideal for DIY electronics enthusiasts looking to enhance their Arduino projects.
    2. Example Code for Arduino-Alarm Trigger

    This article offers a step-by-step guide on setting up an alarm trigger using Arduino and the DS3231M RTC module, including hardware and software requirements, wiring instructions, and detailed example code to ensure precise alarm functionality.
    3. Example Code for Arduino-Get and Set Time

    This article outlines the procedures for utilizing the DS3231M RTC module to set and manage time on an Arduino device. It includes detailed hardware and software setup instructions, a wiring diagram, and sample code for integrating time functionalities into Arduino projects.
    4. Example Code for ESP32-Get NTP Time

    This article offers a comprehensive guide on using an ESP32 with NTP to retrieve accurate time, covering hardware requirements, software setup, and providing sample code to ensure precise time synchronization with the DS3231M RTC module.
    5. Example Code for Arduino-Low Power Consumption and Awake

    Learn to optimize Arduino projects for low power consumption using the DS3231M RTC module with example code and detailed hardware and software setup guidance.
    Reference

    This article serves as a detailed guide to the DS3231M library, focusing on its API functionalities for time management, temperature reading, and alarm setting in Arduino and ESP32 environments, providing installation tips and compatibility insights.

    Specification

    Parameter Value
    Operating Voltage 3.3V~5.5V
    Operating Current 130uA
    Low Power Current 2uA
    Timing Range 1970~2100 year
    Operating Temperature -45℃~ +85℃
    Timing Precision ±5ppm (±0.432 s/D)
    Dimension 22.5x21mm / 0.886x0.827inch

    Pinout

    dfr0641 Board Overview1
    dfr0641 Board Overview2
    dfr0641 Board Overview3

    Num Label Description
    1 VCC +
    2 GND -
    3 SCL IIC clock line
    4 SDA IIC data line
    5 INT Interrupt in low level or 1Hz square wave output
    6 RST Reset calibration pin
    7 32K 32.768KHz pulse output

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