Overview For Raspberry Pi foreign high-precision Clock module DS3231 Note that the Arduino motherboard can also use this module. The module itself can adapt to 3.3V and 5V system, no level conversion, this is super convenient! Characteristics 1. -40°c to +85°c temperature range, timing accuracy remains in ±5ppm (± 0.432 sec/day) 2. Battery backup for continuous timing 3. Low power consumption 4. Device package and function and DS3231 compatibility 5. Complete clock calendar features include seconds, minutes, hours, weeks, dates, months, and years, and provide a leap year compensation valid until 2100 6. Two Calendar alarms 7.1Hz and the 768kHz output 8. Reset output and button to shake input 9. High-speed (400kHz) $literal serial Bus +2.3V to +5.5V Power supply voltage 11. Precision ±3°c Digital Temperature sensor 12. -40°c to +85°c operating temperature range 13.16 pins SO (300mil) package