DS3231 RTC Module

DS3231 RTC Module

The DS3231 RTC Module (Real-Time Clock Module) tracks the current time and date, commonly used in computers, laptops, mobiles, embedded system applications, and other devices.

The DS3231 Real-Time Clock Module is a tiny but powerful device that offers impressive features for precise timekeeping. One of its key features is its high accuracy, with a temperature-compensated crystal oscillator ensuring accurate timing even in extreme conditions. This module also boasts low power consumption, making it ideal for battery-powered applications where efficiency is crucial.

DS3231 RTC Module comes equipped with integrated temperature compensation and aging offset capabilities, further enhancing its reliability over time. Its I2C interface allows for easy communication with microcontrollers or other devices, simplifying integration into various projects.

The built-in power-sense circuit continuously monitors the status of VCC to detect power failures and automatically switches to the backup supply. So, you need not worry about power outages, your MCU can still keep track of time.

The clock operates in both time format i.e. 24 hours and 12 hours with an AM/PM indicator.

Various types of ICs are available for RTC, such as DS1307, DS12C887, etc.

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DS3231 rtc module

DS3231 Pinout

The RTC module has a total of 10 pins that serve different functions, each contributing to the proper operation of the device.

ds3231 rtc pinout
  • VCC:- To give power supply to module this pin is used and connected to 3.3V or 5V pin of Arduino.
  • GND:- It is a ground pin and connects to the Arduino ground pin.
  • SDA and SCL:- These are Serial Data pin and Serial clock pin which is used in I2C serial communication and connects with microcontroller’s I2C pins.
  • SQW:- This is Square Wave pin is driven at either 1Hz, 4kHz, 8kHz or 32kHz and handled programmatically.
  • 32K:- The RTC DS3231 uses an external crystal of frequency 32 kHz which gives output stable and accurate reference clock.

Download DS3231 Datasheet

DS3231 RTC Specifications

The DS3231 RTC module boasts impressive specifications that make it a popular choice for accurate timekeeping in various electronic projects. With an operating voltage range of 2.3V to 5.5V, this module ensures reliable performance across different power sources. It consumes minimal power, making it ideal for battery-powered devices where energy efficiency is crucial.

Featuring a temperature-compensated crystal oscillator (TCXO), the DS3231 offers precise timing with an accuracy of ±2ppm, ensuring consistent and reliable timekeeping over extended periods. Additionally, its integrated I2C interface simplifies communication with microcontrollers, enabling seamless integration into diverse applications.

I2C interfaceFast (400kHz) I2C Interface
EEPROMAT24C32 32Kbit Serial I2C
Time FormatHH: MM: SS (12/24 hr)
Date FormatYY-MM-DD-dd
Accuracy±2ppm from 0°C to +40°C
Accuracy±3.5ppm from -40°C to +85°C
1Hz output pinSQW
32KHz output pin32K
Voltage Supply2.2V to 5.5V for RTC
Operating Voltage (VCC)2.7V ~ 5.5V (including 24C32)
Operating Temperature RangesFor Industrial (-40°C to +85°C) and Commercial (0°C to +70°C)
Battery Holder2032 Coin Battery
Size38 x 22 x 14 mm
Weight8 gm (including Battery)

RTC Module Features

  • DS3231 RTC module had a 2032 Battery Holder.
  • This RTC module counts time in seconds, minutes, hours, date of the month, month, day of the week and year with leap year (valid up to 2100).
  • We Programmed two time-of-day alarms.
  • Programmable Square-Wave Output Signal.
  • Had Battery backup for continuous timekeeping.
  • Use Low Power Operation which extends Battery run time.

Applications of DS3231 RTC Module

The DS3231 RTC Module has a wide range of applications across various industries.

  • One common use is in real-time clock systems, where precise timekeeping is crucial for scheduling tasks and events accurately.
  • In the field of IoT devices, the DS3231 module plays a vital role in timestamping data logs and ensuring synchronization between different connected devices. The module’s high accuracy makes it ideal for applications that require reliable time tracking over extended periods.
  • Moreover, the DS3231 RTC Module finds its place in data logging systems where maintaining an accurate timestamp is essential for recording environmental data, such as temperature and humidity levels.
  • Additionally, you can integrate the module into alarm clocks to utilize accurate timekeeping functionality, along with alarms and reminders based on preset schedules. Its small form factor also makes it suitable for wearable devices that require precise timing capabilities without draining battery life quickly.

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