Overview

The DS3231 is a real-time clock module that maintains accurate timekeeping even when main power is lost. Module includes AT24C32 EEPROM (storage capacity 32K)

The module features:

• High-precision I²C real-time clock with temperature-compensated crystal oscillator (TCXO)
• Accuracy: ±2ppm (±1 minute per year) from -40°C to +85°C
• Battery backup (CR2032) for continuous timekeeping
• Operating voltage: 2.3V-5.5V
• Two programmable time-of-day alarms
• Programmable square-wave output
• Automatic leap year compensation (valid through 2100)
• The device integrates a digital temperature sensor: accuracy ±3°C
• I2C default address 0x68 (like DS1307)
• AT24C32 - default address is 0x57. Addresses can be shorted A0/A1/A2 to modify address

Pinout

• 32K - 32kHz TCXO frequency output
• SQW - ~INT/SQW - provides either an interrupt signal due to alarm conditions or a square wave output
• SCL
• SDA
• VCC
• GND

Remarks

It is possible that DS1307 can be used to certain extent.