High-Precision Real-Time Clock Module DS3231 (RTC) with AT24C32 Memory Chip for Arduino

The DS3231 real-time clock module is an ultra-precise solution for automation projects, data loggers and weather stations that require reliable timekeeping without a constant network connection. High timekeeping accuracy: The built-in temperature-compensated crystal oscillator (TCXO) minimizes clock drift when ambient temperature changes, providing an error of no more than a couple of seconds per month. Standalone power: A battery holder for CR2032 / LIR2032 coin cells keeps the clock running and alarm settings intact when the board's main power is disconnected. Built-in EEPROM memory: The AT24C32 chip with 4 KB capacity lets you store user settings, data logs or system parameters directly on the module. Features RTC chip — Maxim Integrated DS3231SN (ultra-precise real-time clock) Built-in crystal oscillator — TCXO (temperature-compensated crystal oscillator) Memory chip — AT24C32 (non-volatile EEPROM 32 Kbit / 4 KB) Communication interface — I2C / IIC (DS3231 address: 0x68, AT24C32 address: 0x57) Operating voltage — 3.3 V – 5.5 V DC Backup battery — CR2032 (3V) or LIR2032 (3.6V rechargeable) Timing accuracy — ±2 ppm (error no more than ~1 minute per year) Built-in temperature sensor — accuracy ±3 °C Additional functions — 2 programmable alarms, square-wave pulse generator (SQW / 32kHz)