Utilizzo EEprom su cs del DS3231 - Hardware - Arduino Forum
DS3231 RTC Modulo con AT24C02 EEPROM Ad Alta Precisione e I2C Interface modulo Real Time Clock per Arduino|module for arduino|module i2cmodule clock - AliExpress
DS3231 - Rinky-Dink Electronics
Interfacing RTC Module (DS3231) with PIC Microcontroller (PIC16F877A): Digital Clock