🕒 1PCS DS3231SN Precision RTC Real Time Clock Module DS3231 AT24C32 I2C With Memory For Arduino Raspberry Pi

• Operating Voltage: 3.3–5.5V

• RTC Chip: DS3231 high-accuracy TCXO RTC

• Accuracy: 2 PPM (0–40 °C), approx. 1 minute/year

• Two calendar alarms

• Programmable square-wave output

• Time/Calendar: seconds, minutes, hours, weekday, date, month, year; leap-year compensation to 2100

• Internal temperature sensor ±3 °C

• EEPROM: AT24C32 (A0/A1/A2 addressable), default I²C address 0x57

• I²C interface up to 400 kHz (at 5V)

• CR2032 coin-cell holder for backup (battery not included)

• Packaging: well-protected, intact on arrival

Adapts to 3.3V & 5V systems — no level shifting required.

• Timing accuracy ±5 ppm from −40 °C to +85 °C (±0.432 s/day)

• Backup battery support for continuous timekeeping

• Low power consumption

• Package and functions compatible with DS3231

• Full clock/calendar: sec/min/hr/weekday/date/month/year; leap-year to 2100

• Two calendar alarms

• 1 Hz and 32.768 kHz outputs

• Reset output and button de-bounce input

• Fast I²C up to 400 kHz

• Supply Voltage: +2.3V to +5.5V

• Digital temperature sensor ±3 °C

• Operating temperature: −40 °C to +85 °C

• Chip package: 16-pin SO (300 mil)