DS3231 RTC Module Precise Real Time Clock I2C – AT24C02
₹159.30 incl. GST (₹135.00 + GST)
The DS3231 IIC RTC Module is a high-precision real-time clock designed for accurate time and date tracking in Arduino, ESP32, Raspberry Pi, STM32, and other embedded systems. It features a temperature-compensated oscillator, digital temperature sensor, two programmable alarms, and AT24C32 4KB EEPROM for data storage. The module supports I²C communication and includes a CR2032 battery holder for backup timekeeping; the battery is not included.
The DS3231 IIC RTC Module is a high-precision and reliable real-time clock module designed for accurate timekeeping in electronic and embedded systems. Based on the Maxim DS3231 RTC IC, it uses a temperature-compensated crystal oscillator (TCXO) to provide excellent timekeeping accuracy with minimal frequency drift. This makes it particularly suitable for applications where more precise timekeeping is required.
The module communicates with a host microcontroller through the I²C two-wire interface, making it easy to integrate with popular development platforms such as Arduino, ESP32, ESP8266, Raspberry Pi, STM32, AVR, and PIC. It supports both 12-hour and 24-hour time formats and includes an AM/PM indicator when operating in 12-hour mode.
An onboard AT24C32 EEPROM provides 32Kbit (4KB) of non-volatile storage, allowing users to store configuration data, event information, calibration values, or other small amounts of information. The RTC also includes two programmable alarms and a configurable square-wave output, providing additional functionality for time-based control and scheduling applications.
The module features a built-in 10-bit digital temperature sensor with 0.25°C resolution, allowing the system to monitor the temperature around the RTC. An aging trim register is also provided for fine frequency calibration when required.
A CR2032 battery holder provides backup power capability, allowing the RTC to continue maintaining time when the main power supply is disconnected. The CR2032 battery is not included and can be added separately when backup timekeeping is required.
Features
- High-precision DS3231 real-time clock IC
- Temperature-compensated crystal oscillator (TCXO)
- Excellent timekeeping stability with low frequency drift
- Accuracy of approximately ±2 ppm from 0°C to +40°C
- Accuracy of approximately ±3.5 ppm from -40°C to +85°C
- Built-in 10-bit digital temperature sensor
- Temperature resolution of 0.25°C
- Temperature sensor accuracy of approximately ±3°C
- Supports 12-hour and 24-hour time formats
- AM/PM indicator for 12-hour format
- Two programmable alarms
- Programmable square-wave output
- Square-wave frequencies from 1Hz to 8kHz
- I²C communication interface
- Supports I²C communication speeds up to 400kHz Fast Mode
- Onboard AT24C32 32Kbit (4KB) EEPROM
- Non-volatile memory for additional data storage
- Aging trim register for frequency calibration
- CR2032 backup battery holder
- Compatible with 3.3V and 5V logic systems
- Low power consumption
- Suitable for accurate timekeeping applications
- Compact design for embedded systems
Specifications
| Parameter | Specification |
|---|---|
| Product Type | High-Precision Real-Time Clock Module |
| RTC IC | DS3231 |
| Communication Interface | I²C |
| I²C Speed | Up to 400kHz |
| Operating Voltage | 2.3V–5.5V |
| EEPROM | AT24C32 |
| EEPROM Capacity | 32Kbit / 4KB |
| Temperature Sensor | 10-bit Digital Sensor |
| Temperature Resolution | 0.25°C |
| Temperature Accuracy | Approximately ±3°C |
| Time Format | 12 / 24 Hour |
| Programmable Alarms | 2 |
| Square-Wave Output | 1Hz–8kHz |
| Backup Battery | CR2032, 3V |
| Battery Included | No |
| Operating Temperature | -40°C to +85°C |
| Accuracy | ±2 ppm (0°C–+40°C), ±3.5 ppm (-40°C–+85°C) |
| Dimensions | Approximately 38mm × 22mm × 14mm |
| Weight | Approximately 8g |
Design and Construction
The DS3231 RTC module is built around the DS3231 high-precision real-time clock IC and integrates the supporting components required for accurate timekeeping, temperature measurement, backup power, and I²C communication.
The module uses a temperature-compensated crystal oscillator, which helps compensate for changes in oscillator frequency caused by temperature variations. This provides better timekeeping stability compared with basic RTC modules that use a conventional crystal oscillator.
An onboard AT24C32 EEPROM provides additional non-volatile storage. The memory can be accessed by the host microcontroller through the I²C interface and can be used for storing small amounts of persistent project information.
The board includes a CR2032 battery holder for backup operation. When a suitable battery is installed, the RTC can continue maintaining time when the main power supply is removed.
The module also provides access to the RTC’s alarm and square-wave functions, allowing it to be integrated into systems that require scheduled events, periodic timing signals, or interrupt-based control.
The compact PCB design makes the module suitable for breadboard prototyping, embedded systems, automation projects, IoT devices, and custom electronic equipment.
Working Principle
The DS3231 maintains accurate time and calendar information using its integrated temperature-compensated oscillator and RTC circuitry. It keeps track of seconds, minutes, hours, day, date, month, and year.
The host microcontroller communicates with the DS3231 through the I²C interface. The controller can read the current time and date, update the clock, configure alarms, and access other supported functions.
The temperature-compensation system continuously accounts for oscillator frequency changes caused by temperature variations. This helps the RTC maintain accurate time over a wide operating temperature range.
The integrated 10-bit digital temperature sensor measures the temperature near the RTC and provides the result digitally with a resolution of 0.25°C. This temperature information can also be read by the connected microcontroller through the I²C interface.
The two programmable alarms can be configured to trigger events at specific times or intervals. The programmable square-wave output can provide periodic timing signals from 1Hz to 8kHz, depending on the selected configuration.
When the main system power is unavailable, a suitable CR2032 battery installed in the holder can provide backup power for the RTC, allowing it to maintain the current time.
The onboard AT24C32 EEPROM operates independently as non-volatile memory and can be used to retain data even when the main power is disconnected.
Applications
- High-accuracy real-time clock systems
- Arduino clock projects
- Arduino Uno, Nano, and Mega projects
- ESP32 timekeeping systems
- ESP8266 IoT projects
- Raspberry Pi real-time clock applications
- STM32 embedded systems
- Time-stamped data logging
- Environmental data loggers
- Sensor monitoring systems
- IoT devices
- Smart home automation
- Time-based automation systems
- Event scheduling systems
- Alarm systems
- Digital clocks
- Electronic timers
- Power management systems
- Industrial automation
- Embedded control systems
- Attendance systems
- Access control systems
- Precision timing applications
- Battery-backed timekeeping
- Educational electronics projects
- Custom embedded systems
Compatibility
- Arduino Uno
- Arduino Nano
- Arduino Mega
- ESP32
- ESP8266
- Raspberry Pi
- STM32
- AVR
- PIC
- Other microcontrollers supporting I²C communication
Package Includes
- 1 × DS3231 IIC RTC Module with AT24C32 EEPROM and CR2032 Battery Holder
Note: CR2032 backup battery is not included.
Product Disclaimer
Product images are shown for illustrative and representational purposes only. The actual product may vary slightly in colour, dimensions, PCB layout, component placement, connector arrangement, or appearance depending on the manufacturing batch.
CR2032 battery, Arduino boards, ESP32 boards, Raspberry Pi boards, connecting wires, breadboards, displays, sensors, power supplies, and other components shown in product images are not included unless specifically mentioned in the package contents.
The CR2032 battery is not included. Install a suitable 3V CR2032 coin cell in the provided holder when backup timekeeping is required.
The stated accuracy figures are based on the DS3231 device specifications and may vary depending on the module implementation, operating conditions, temperature, power supply, and other environmental factors.
The module should be operated within its specified voltage and temperature ranges. Verify the I²C wiring, power connections, and battery polarity before use.
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FAQs
1. What is the DS3231 RTC Module used for?
The DS3231 RTC Module is used for high-accuracy time and date tracking in electronic and embedded systems. It can be used in digital clocks, data loggers, IoT devices, automation systems, alarms, attendance systems, and other applications that require reliable timekeeping.
2. Why is the DS3231 considered a high-accuracy RTC?
The DS3231 uses a temperature-compensated crystal oscillator (TCXO), which helps compensate for frequency changes caused by temperature variations. This provides better timekeeping stability than many basic RTC modules.
3. What information can the DS3231 track?
The DS3231 tracks seconds, minutes, hours, day, date, month, and year. It also supports automatic calendar functions and can operate in either 12-hour or 24-hour format.
4. What communication interface does the DS3231 use?
The module uses the I²C two-wire serial communication interface. This allows a compatible microcontroller to read and configure the RTC using only the required I²C data and clock connections.
5. Which development boards are compatible with the DS3231?
The module can be used with Arduino Uno, Nano, Mega, ESP32, ESP8266, Raspberry Pi, STM32, AVR, PIC, and other controllers that support compatible I²C communication.
6. What is the operating voltage of the DS3231 module?
The DS3231 IC supports an operating voltage range of approximately 2.3V to 5.5V, making the module suitable for many 3.3V and 5V logic systems. The actual module supply requirements should be checked before connection.
7. Does the module include a backup battery?
The module includes a CR2032 battery holder, but the CR2032 battery is not included. A suitable 3V CR2032 coin cell can be installed when backup timekeeping is required.
8. What happens when the main power supply is disconnected?
When a suitable CR2032 battery is installed, the RTC can continue maintaining the current time while the main system power is disconnected. This allows the correct time to be recovered when the system is powered again.
9. What is the accuracy of the DS3231?
The DS3231 is specified for approximately ±2 ppm accuracy from 0°C to +40°C and approximately ±3.5 ppm from -40°C to +85°C. Actual system performance can vary depending on the module, temperature, power supply, and operating conditions.
10. Does the DS3231 have a temperature sensor?
Yes. The DS3231 includes a 10-bit digital temperature sensor with approximately 0.25°C resolution. The temperature information can be read digitally through the I²C interface.
11. What is the purpose of the built-in temperature sensor?
The temperature sensor provides a digital measurement of the temperature around the RTC and also supports the temperature-compensation function used to maintain oscillator accuracy.
12. Does the DS3231 have programmable alarms?
Yes. The DS3231 provides two programmable alarms. These can be configured for time-based events and can be used by a microcontroller for scheduled operations or interrupt-driven applications.
13. What is the square-wave output used for?
The module provides a programmable square-wave output from 1Hz to 8kHz. It can be used for timing, synchronization, pulse generation, and other applications that require a periodic signal.
14. Does the module include EEPROM memory?
Yes. This module includes an AT24C32 EEPROM with a capacity of 32Kbit (4KB). It provides additional non-volatile storage for project data.
15. What can be stored in the AT24C32 EEPROM?
The EEPROM can be used to store configuration settings, calibration values, event records, counters, user preferences, sensor information, and other small amounts of data that should remain available after power is removed.
16. Can the DS3231 RTC and AT24C32 EEPROM be used simultaneously?
Yes. The RTC can provide time and date information while the EEPROM stores additional project data. Both devices can be accessed by a compatible microcontroller through the I²C bus.
17. Can the DS3231 be used for data logging?
Yes. It is particularly useful for time-stamped data logging. A microcontroller can read the current time from the RTC and attach the timestamp to temperature, humidity, sensor, or other recorded data.
18. Can the DS3231 be used in IoT projects?
Yes. The module is useful for IoT applications requiring accurate local timekeeping, especially for systems that need reliable timestamps for sensor readings, events, or offline data.
19. Can the DS3231 be used with Arduino?
Yes. The module is widely used with Arduino Uno, Nano, Mega, and other Arduino-compatible boards. Suitable libraries can be used to read and set the RTC time and configure supported functions.
20. Can the DS3231 be used with ESP32 and ESP8266?
Yes. Both ESP32 and ESP8266 can communicate with the module through I²C. It can be used for IoT clocks, data loggers, automation systems, and time-based wireless applications.
21. Can the DS3231 be used with Raspberry Pi?
Yes. The module can be connected to a Raspberry Pi through its I²C interface with suitable software configuration. It can be used as an external real-time clock for compatible applications.
22. What is the difference between DS3231 and DS1307 RTC modules?
The DS3231 generally provides significantly better timekeeping accuracy because it uses a temperature-compensated oscillator. It also includes a digital temperature sensor and two programmable alarms, making it a more advanced option for applications requiring greater accuracy and functionality.
23. Can the DS3231 be used for digital clocks?
Yes. The module is well suited for digital clock and calendar projects. A microcontroller can read the time and display it on an LCD, OLED, seven-segment display, or other compatible display.
24. Can the DS3231 be used for alarms and timers?
Yes. Its two programmable alarms make it suitable for alarm clocks, scheduled tasks, timers, reminders, and other time-controlled applications.
25. Can the DS3231 control appliances automatically?
The RTC itself does not directly control appliances. However, a microcontroller can read the DS3231 time and use the information to control relays, lights, fans, pumps, motors, or other devices according to a programmed schedule.
26. Is the DS3231 suitable for battery-backed applications?
Yes. When a suitable CR2032 battery is installed, the RTC can maintain time while the primary power source is unavailable, making it useful for battery-backed clocks, data loggers, automation controllers, and embedded systems.
27. What is the operating temperature range of the DS3231?
The specified operating temperature range is approximately -40°C to +85°C, making the DS3231 suitable for a wide range of environmental and embedded applications.
28. Is the DS3231 suitable for precision timing applications?
Yes. Its temperature-compensated oscillator and specified accuracy make it suitable for applications requiring more stable timekeeping than basic RTC modules, although it should not be treated as a laboratory-grade precision timing reference.
29. Does the DS3231 need an external crystal?
No. The DS3231 includes its temperature-compensated oscillator and crystal resonator, so an external timing crystal is not normally required for standard operation.
30. What is the purpose of the aging trim register?
The aging trim register allows the oscillator frequency to be fine-adjusted when calibration is required. This can help compensate for small frequency differences in precision applications.
31. Is the DS3231 module suitable for beginners?
Yes. Its I²C interface, wide development-board compatibility, and readily available software libraries make it suitable for students, hobbyists, makers, and beginners working on embedded electronics projects.
32. What are the common applications of the DS3231 module?
Common applications include digital clocks, data loggers, IoT systems, time-based automation, alarm systems, attendance systems, access-control systems, sensor monitoring, scheduling systems, embedded controllers, and precision timekeeping projects.
33. What should be checked before connecting the module?
Before use, verify the power supply voltage, I²C connections, battery polarity, and microcontroller compatibility. If backup timekeeping is required, install a suitable CR2032 battery correctly in the battery holder.
34. What is included in the package?
The package includes 1 × DS3231 IIC RTC Module with AT24C32 EEPROM and CR2032 battery holder. The CR2032 battery is not included, and microcontrollers, wires, displays, breadboards, and other accessories are not included unless specifically mentioned.
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