DS1307 Real-Time Clock I2C Module


This is DS1307 RTC Real Time Clock I2C Module for Arduino and It contains a DS1307 real-time clock IC. DS1307 is one of the easiest-to-use RTCs out there, with Arduino and other libraries, or truly use I2C commands to set and retrieve the time and date, includes a lithium coin cell battery which needs to be good for 4 years at least. alongside the DS1307 actual-time clock, the module also has an Atmel 24C32 EEPROM chip that’s on hand for storing data without worrying about power loss, there is also an area on the board to solder your own DS18B20 temperature sensor. This battery backup option allows you to keep a fairly correct time even if your Arduino is powered off and it’s far very useful in data logging and different time-sensitive packages. The tool uses I2C to speak with your Arduino.

Features of DS1307

  • Two-wire I2C interface
  • Hour: Minutes: Seconds AM/PM
  • Leap year compensation
  • Accurate calendar up to the year 2100
  • Consumes Less than 500nA in Battery-Backup
  • 1Hz output pin
  • 56 Bytes of Non-volatile memory available to the user
  • 4KB of serial electrically erasable and programmable read-only memory (EEPROM)
  • Embed DS18B20 temperature sensor interface with the pull-up resistor.

Pinout of DS1307

Pin TypeDescription
SQW  outputs one of four square-wave frequencies 1Hz, 4kHz, 8kHz, or 32kHz
DS output temperature readings if your module has a DS18B20 temperature sensor

is the clock input for the I2C interface and is used to synchronize data movement on the serial interface.
 SDAdata input/output for the I2C serial interface.
VCCsupplies power for the module between 3.3V to 5.5V.
GND  ground pin.
BATis a backup supply input for any standard 3V lithium cell

Specifications of DS1307

  • I2C Interface RTC IC
  • Operating Voltage: 5V
  • Less than 500nA current when operating with battery
  • 56bytes SVRAM
  • Operates in power or battery mode
  • Programmable square wave output pin
  • Available in PDIP and SO package


  • Robotics
  • Gaming
  • Servers
  • Computer Peripherals

Datasheet of

Download DS1307 Real-Time Clock I2C Module Datasheet from the link given below.

Leave a Comment