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