The DS3231 is a low-cost I2C RTC, with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. Compared to the DS1302 solution, the DS3231 has many advantages, it function with a VCC ranging from 2.3V to 5.5V and has a battery backup. Unlike the DS1307, the DS3231 also has an integrated crystal, temperature sensor, 2 programmable time-of-day alarms, and a 32.768 kHz output pin to ensure higher accuracy. It is also consists of an EEPROM AT24C32 to supply you 32K EEPROM to store your data.

Features:

• Size: 38mm (length) * 22mm (W) * 14mm (height).
• Weight: 8g.
• Operating voltage :3.3 - 5 .5 V.
• Clock chip: high-precision clock chip DS3231.
• Clock Accuracy :0-40 ℃ range, the accuracy 2ppm, the error was about 1 minute.
• Calendar alarm clock with two.
• Programmable square-wave output.
• Real time clock generator seconds, minutes, hours, day, date, month and year timing and provide valid until the year 2100 leap year compensation.
• Chip temperature sensor comes with an accuracy of 3.
• Memory chips: AT24C32 (storage capacity 32K).
• IIC bus interface, the maximum transmission speed of 400KHz (working voltage of 5V).
• Can be cascaded with other IIC device, 24C32 addresses can be shorted A0/A1/A2 modify default address is 0x57.

Applications:

• Arduino based Clock
• Arduino based robotics
• I2C based arduino projects
• I2C based RTC
• I2C based EEPROM interfacing