Raspberry Pi RTC DS3231

The module itself can adapt to 3.3V and 5V systems without level conversion, which is super convenient!
two. Features:
1. In the temperature range of -40°C to +85°C, the timing accuracy is maintained at ±5ppm (±0.432 seconds/day)
2. Provides battery backup for continuous timing
3. Low power consumption
4. Device packaging and functions DS3231 is compatible with
5. Complete clock and calendar functions including seconds, minutes, hours, day of the week, date, month and year, and provide leap year compensation valid to 2100.
6. Two calendar alarms
7.1Hz and 32.768kHz output
8. Reset output And button debounce input
9. High-speed (400kHz) I2C serial bus
10. +2.3V to +5.5V power supply
11. Digital temperature sensor with accuracy of ±3°C
12. -40°C to +85°C operation Temperature range
13.16-pin SO (300mil) package