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 (Battery not included) with charging circuit
  • 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
  • Weight : 0.008 kg
• 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
  • Weight : 0.008 kg

Device	Clock Module
Type	DS1307