• DS1307 I2C real-time clock chip (RTC)
• 24C32 32K I2C EEPROM memory
• Two wire I2C interface.
• Hour : Minutes : Seconds AM/PM.
• Day Month, Date - Year.
• Built-in IR2032 rechargeable lithium battery
• Solve up the problem of the backup battery(DS1307) which can not read and write.
• Support timming 1 year of the DS1307 after fully charged
• Compact design: 27mm*28mm*8.4mm
• Leads pins to the a DS1307 clock ,provide the clock signal for the microcontroller.
• Can be cascaded to other I2C devices.

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.

DS1307 features:

• Of 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

This is the DS1307 Real Time Clock developed by one of our designer waiman. The module comes fully assembled and pre-programmed with the current time (ok, so it's our current time - MST). The included Lithium coin cell battery (CR1225 41mAh) will run the module for a minimum of 9 years (17 years typical) without external 5V power. The DS1307 is accessed via the I2C protocol.

Package Content：

1x DS1307 Module. (Because of shipping restrictions, some times we won't shipBettery.)

Bluetooth Module	Master Module	Slave Module	Baseboard Module