1. Using LIR2032 rechargeable lithium battery with charging circuit to solve the problem of DS1307 not being able to read and write with backup battery. After being fully charged, it can provide DS1307 timing for 1 year.
2. Introduce the clock pin of DS1307 to provide a clock signal for the microcontroller.
3. Other I2C devices can be cascaded.
Product features:
1. It can count seconds, hours, minutes, monthly days, months, and weekly days, and has leap year compensation function. The annual limit is 2100.
2. 56 bytes of non-volatile RAM.
3. Automatic power failure detection and switching circuit.
4.Working voltage: DC5V
