DS1307 Tiny RTC with 32K EEPROM for Arduino

This tiny RTC module is based on the clock chip DS1307 which supports the I2C protocol. It uses a Lithium cell battery (CR2032). The clock/calendar provides seconds, minutes, hours, day, date,month, and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator.

On board there is 24C32N EEPROM chip, which can be accessed via I2C bus.

If your project uses SPI bus maybe modules with DS1302 will be easier to use.

Set includes:

• module itself
• CR2032 battery is sometimes added sometimes it is not, we can not guarantee You will receive battery with module consider new CR2032 battery
• no goldpins included

Specification:

Board has two goldpin rows. When both soldered, it will hard to insert board into breadboard, so solder both of them when You want to connect another sensor to I2C bus using second connector as extension.

RTC part

• I2C address: 0x68
• 5V DC supply
• Programmable Square-Wave output signal
• Automatic Power-Fail detect and switch circuitry
• Consumes less than 500nA in Battery-Backup Mode with Oscillator Running
• 56-Byte, Battery-Backed, Nonvolatile (NV)RAM for data storage

EEPROM part

• I2C address: 0x50
• 32K bits capacity
  • 4K bits High Endurance (10 000 000 Erase/Write cycles guaranteed) for frequently changed data
  • 28K bits Standard Endurance (100 000 Erase/Write cycles guaranteed)