Fermion: DS3231M MEMS Precise RTC (Breakout)

SKU:DFR0641 Brand:DFRobot Reward Points: 69
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Topic: Fermion
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This MEMS Precise RTC Breakout Board adopts DS3231M chip, which integrates MEMS resonator and temperature compensator. Compared to quartz crystal clock, the real-time clock reduces the risk of mechanical failure. Therefore, it can be used in a highly vibrating environment. Within -45°C to +85°C, the accuracy of the DS3231M is ±5ppm (±0.432 s/D).

The RTC based on MEMS has already passed both shock tests and vibration tests that certified by ACE-Q100. It can withstand 2900g mechanical shock (JESD22-B104C Condition-H) and 20g variable frequency vibration (JESD22-B103B Condition-1).

The DS3231M can be powered by a coin cell battery and can still maintain accurate timing even the mains are disconnected. RTC provides information about seconds, minutes, hours, days, months, and years. It can automatically adjust the end date of the month and the leap year correction. The clock format can be 24 hours or 12 hours with AM/PM indication. It provides two programmable calendar alarms and one 1Hz square wave output. In addition, the RST check pin can be used as a key input for microprocessor reset.

Note: According to the latest Air Transport Regulations, the batteries, magnets and liquids transport will be very stringent, so the cell battery CR1220 will not come with the module any more. Please buy it from the local supermarket.

DS323X Selection Guide

Product Name
Fermion: DS3231M MEMS
 Precise RTC  Module
Fermion: DS3231 
Precision RTC Module
Fermion: DS3232
 Precision RTC Module
SKU DFR0641 DFR0819 DFR0821
Storage None None 236Byte
Integrated Resonator MEMS XTAL XTAL
Timing Current 2000nA 840nA 1500nA
Timing Precision ±5ppm (±0.432s/d) ±3.5ppm (±0.3024s/d) ±3.5ppm (±0.3024s/d)
Operating Voltage 3.3V-5.5V 3.3V-5.5V 3.3V-5.5V
Operating Temperature -45℃ ~ 85℃ -40℃ ~ 85℃ -40℃ ~ 85℃
Introduction Integrated MEMS resonatr, reducing the risk of mechanical failure, suitable for use in strong and frequent vibration. A RTC module with integrated crystal resonator, featuring a higher precision and a lower  power consumption, suitable for use in the occasion in demand of high precision and low power. A RTC module with integrated crystal resonator, equipped with 236Byte SRAM storage inside, enabling it to store data at an extremely low power consumption, suitable for low-power loT applications requiring real-time clock.


  • High anti-vibration
  • Internal MEMS resonator and temperature compensator
  • High precision: ±5ppm (±0.432 s/D) at -45°C to +85°C
  • Clock calendar
  • 2 programmable calendar alarms


  • Operating Voltage: 3.3V-5.5V
  • I2C Address: 0x68
  • Timing Range: 1970~2100 year
  • Operating Temperature: -40°C to +85°C
  • Timing Precision: ±5ppm (±0.432 s/D)
  • Dimension: 22.5*21mm / 0.886*0.827inch


Project 1: Making an Arduino OLED Ring Clock

The hardwares you need to do this project:

0.91”128x32 I2C OLED Displayx1

DS3231M MEMS Precise RTCx1


3.7V Lithium Battery Charger x1

1000mah 3.7v Lithium Battery x1

Needle x1

A piece of elastic braid tape


Shipping List

  • DS3231M MEMS Precise RTC x1
  • 2.54-7P Pin x1



    Fermion: DS3231M MEMS Precise RTC (Breakout)

    In Stock
    • 3-4$6.70
    • 5-9$6.50
    • 10+$6.30