DS3231 AT24C32 IIC Precision RTC Real Time Clock Memory Module Programmable Square Wave Output For Arduino without Battery _x000D_ Features _x000D_ _x000D_ 1. The product is compact and small _x000D_ _x000D_ 2. Programmable square wave output _x000D_ _x000D_ 3. Storage chip: AT24C32 (storage capacity 32K) _x000D_ _x000D_ 4. Easy to use _x000D_ _x000D_ 5. Widely applicable _x000D_ _x000D_ _x000D_ _x000D_ Parameters _x000D_ _x000D_ 1. Size: 38mm (length) * 22mm (width) * 14mm (height) _x000D_ _x000D_ 2. Working voltage: 3.3-5.5V _x000D_ _x000D_ 3. Clock chip: high-precision clock chip DS3231 _x000D_ _x000D_ 4. Clock accuracy: within the ambient temperature range of O-40 C, with an accuracy of 2ppm and an annual error of about 1 minute. 5. Comes with 2 calendar alarms _x000D_ _x000D_ 6. Programmable square wave output _x000D_ _x000D_ 7. Real time clock generates timing for seconds, minutes, hours, weeks, dates, months, and years, and provides leap year compensation valid until 2100 _x000D_ _x000D_ 8. The chip comes with a built-in temperature sensor with an accuracy of 3 _x000D_ _x000D_ 9. Storage chip: AT24C32 (storage capacity 32K) _x000D_ _x000D_ 10. IIC bus interface, maximum transmission speed 400KHZ (when working at 5V) _x000D_ _x000D_ 11. Other C devices can be cascaded, and the 24C32 address can be modified by short circuiting A0/A1/A2, with the default address _x000D_ _x000D_ For 0x57 _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_