DS3231 is a low cost and extremely accurate I2C real-time clock, with an integrated crystal and temperature-compensated crystal oscillator (TCXO).  DS3231 can be operated using supply voltages ranging from 2.3 V to 5.5 V and it also features battery backup capabilities.

The DS3231 features an integrated crystal, 2 programmable time-of-day alarms, a temperature sensor, and 32.768 kHz signal output pin.

The AT24C32 EEPROM is a 32K EEPROM that can be used to add non-volatile data storage to your electronic projects and prototypes.

The module also features a battery holder, allowing you to add a backup battery to ensure continuous operation.

Features

• Can be connected directly to the microcontroller IO ports
• Standard 2.54 mm pins for input and output connections
• Two calendars and alarm clock
• Two programmable square-wave outputs
• Real time clock generator for seconds, minutes, hours, day, date, month, and year timing
• Valid until 2100 with leap year compensation
• Can be cascaded with other I2C devices
• The address can be set using the pins A0/A1/A2 (the default address is 0x57)
• Battery socket compatible with LIR2032 batteries