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Real Time Clock Module

A real-time clock, or - RTC, is a digital clock with a primary function to keep accurate track of times even when a power supply.
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Real Time Clock Module.

Introduction Real Time Clock:

A real-time clock, or - RTC, is a digital clock with a primary function to keep accurate track of times even when a power supply is turned off and a device is placed in low power mode. RTCs were comprised of a controller, oscillator, and an embedded quartz crystal resonator

RTC module detects the voltage drops of the main power supply and automatically switches to a backup power supply for the operation. while the MoS switch suppresses leakage currents and voltage drops, enabling efficient power management of the entire system compared to diode OR circuits.

A real-time clock (RTC) is an integrated circuit that contains a timer that supplies the time of days (and often, the dates). An RTC -generally contains a long-life battery to allow it to keep track of the times even when there is no power applied.


  1. Operating Voltage (VDC): Operating Voltage (VDC)
  2. Voltage Supply for RTC: 2.2 V ~ 5.5 V 2.2 V ~ 5.5 V ±2ppm from 0°C to +40°C., ±3.5ppm from -40°C to +85°C.
  3. Battery Holder:2032 Coin Battery.
  4. I2C interface Fast:(400kHz) I2C Interface. 8 more rows
Real Time Clock Module

Circuit Operation:

Keeping track of the current dates/times for an Arduino has many purposes. One use for it is for recording/log purposes. For example, an Arduino Weather Station needs timestamps to record weather data. Another example is an Arduino digital clock or calendar. Arduino-based clocks use the current times as a timer of reminders or to execute a scheduled command via the Arduino’s I/O pins. Depending on the project, having a way to get the current date and time is more useful.

HOW TO GET THE CURRENT DATES AND TIMES ON AN ARDUINO There are several ways to get the current dates and times. We can get it from a Real-Time Clock (RTC), a GPS device, or a times server.

real time clock dodule circuit operation

Real-Time Clock (RTC) – A Real-Time Clock, or RTC for short, is an integrated circuit that keeps track of time. It uses a backup battery to maintain the time if the main power source is removed.

Global Positioning Devices (GPS) – A GPS device communicates with satellites to determine its location anywhere in the world. Its GPS data also contains times data. TimesServer– A Times Server is a computer on a network that reads the time for some reference clock and distributes it to the network. The clock source of a time server can be another time severity, an atomic clock, or a radio clocks An RTC is a very popular and accurate source of time and data in an embedded system like an Arduino because it has low power consumption.

If you want to learn how to communicate with an Internet times server to get the current time and date, please read How to Keep Track of the Dates and Times on an Arduino.

Read Also:

How the Real Time Clock Work:

The RTC keeps track, of seconds, minutes, hours, days dates, months, and years of data. It also automatically adjusts for months with less than 31 days and also for leap years. The clock can operate in either 24-H or 12-H (with AM/PM) formats. There are also two programmable time-of-day alarms and a programmable square-wave output. Communication with the RTC is done through an I2-C interface with a fixed default address of( 0x68.)

Aside from the RTC chip, this particular module also has a 24C32 EEPROM chip. An EEPROM is a kind of data storage device wherein you can read or write data. The 24C32 has 32 bytes of available data storage space. It shares the module’s I2C bus with the DS-3231 and shall be the default address of (0x57). We shall change the EEPROM’s default address by bridging the solder pads indicated by A0, A1, and A2 as shown in Figure 2.

Frequently Asked Questions

What is real real-time clock in PLC?

It is the clock that measures elapsed times from a beginning set point to an ending setpoint. You must manually set the clock up and include any interim set points when a relay must be triggered to control an action of the devices the PLC was controlling.

Which Arduino has a real-time clock?

Learn how to access the real-time clock (RTC) of the UNO R-4 Minima. In this tutorial, you'll learn how to access the real-time clock (RTC) of an Arduino UNO R-4 Minima board. The RTC was embedded in the UNO R4 Minima's microcontroller (RA4M1).

Does ESP32 have a real-time clock?

The ESP32- RTC module only has a timer that runs even in hibernation mode as well as some RAM that it could retain in deep sleep mode. Some interrupt inputs can be used to have been the RTC waking up the main processor. There's no

What are the advantages of real-time clock?

Real-time clocks (RTCs) are devices that keep track of the current time and date. Some of the advantages of using an RTC include Accurate timekeeping: RTCs are typically more accurate than other methods of timekeeping, such as using a computer's clock, which can drift over time. Motherboard clocks are the main clock synthesizers of PC and server platform CPU chipsets. The devices generally use low-cost, standard quartz crystals at the input, and.

what is the system clock in stm32?

The system clock was selected between the HSI, HSE, and PLL output. The maximum system clock frequency is 216- MHz. The APB1 and APB-2 bus frequencies were also up to 54- MHz. and 108 MHz respectively maximum the clock source frequency depends on the voltage.

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