Details:

• DS1307 I2C real time clock chip (RTC)
• 24C32 32K I2C EEPROM memory
• Using LIR2032 rechargeable lithium battery and charging circuit with DS1307 with battery backup can not solve the problem of literacy
• Fully charged, can provide DS1307 timing 1 year
• Compact design, 27mm x 28mm x 8.4mm
• Leads to the DS1307 clock pin provides a clock signal for the microcontroller
• Other I2C devices can be cascaded

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