This module integrates the real-time clock module DS1307 and EEPROM memory AT24C32 together via a I2C bus together on a 27mm*28mm*8.4mm board.

DS1307 is a low-power real-time clock chip with 56 bytes of non-volatile RAM, full BCD code clock and calendar. The address and data will be transmitted via a two-wire bidirectional serial bus, and the chip can provide information such as seconds, minutes, hours, etc., and the number of days in each month can be automatically adjusted. Besides, there is a compensation function for leap year.  The AM / PM flag is to determine whether the clock operates in 24-hour or 12-hour mode, and there is a built-in power-sense circuit in the chip with powering down detecting and battery switching functions.

The AT24C32 EEPROM can store 8K (8192) bytes. It supports 1.8V to 5V power supply, which can be erased one million times, and the data can be kept for 100 years. When using a 5V power supply, the clock can reach 400 KHz.

• Dimensions: 27mm * 28mm * 8.4mm
• On-board DS1307 I2C real-time clock chip (RTC)
• On-board 24C32 32K I2C EEPROM memory
• Slot for CR2032 battery (NOT INCLUDED)
• Can be cascaded to other I2C devices.

Below are the manufacturer's specifications and instrucions.  However, these instructions work just fine: BLDR INSTRUCTIONS

DS_AT24C32.pdf2013-07-10 06:28:00209.7KB

DS_DS1307.pdf2013-07-10 06:27:58315.1KB

DS_IM130710004.pdf2013-07-10 09:14:30393.8KB

Schematic

SCH_IM130710004.pdf2013-07-10 06:27:5253.4KB

Demo Code

DC_IM130710004.zip

Connection to Arduino: