DS1307 I2C real-time clock chip (RTC)
The using CR2032 rechargeable lithium battery with charging circuit
Solve the problem DS1307 with backup battery can not read and write.
Fully charged, it can provide the DS1307 timing
Compact design, 27mm * 28mm * 8.4mm
Leads to the a DS1307 clock pin, to provide the clock signal for themicrocontroller.
Can be cascaded to other I2C devices