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The DS1307 is a low power, with 56 bytes of non-volatile RAM BCD code clock calendar real-time clock chip, the address and data transmission through the two-wire bidirectional serial bus, the chip can be seconds, minutes, hours and other information , the number of days in each month can be adjusted automatically. And there is a leap year compensation function. AM / PM flag determines clock work 24-hour or 12-hour mode, the chip has a built-in power-sense circuit, brownout detection and battery switching function.




  • Module Feature :
    • DS1307 I2C real-time clock chip (RTC)
    • 24C32 32K I2C EEPROM memory
    • Using LIR2032 rechargeable lithium battery (not included) with charging circuit. (Do not charge if used with CR2032!) 
    • Fully charged, it can provide 1 year lifetime
    • Compact design, 27x28x8.4mm
    • Leads to the a DS1307 clock pin, to provide the clock signal for the MCU
    • Can be cascaded to other I2C devices


  • DS1307 Feature :
    • Can account seconds, hours, minutes, monthly number of days, months, days of the week count with leap year compensation function. Record the year on line 2100
    • 56 bytes of non-volatile RAM
    • Two-wire serial interface
    • Programmable square-wave output
    • Automatic power-down detection and switching circuit
    • In battery backup mode, power consumption is less than 500nA

Battery not included.



1. Interface DS1307 RTC Module with Arduino


I2C RTC DS1307 AT24C32 Real Time Clock Module

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