The DS3231M is a low-cost, extremely accurate I2C real-time clock (RTC). The device incorporates a battery input and maintains accurate timekeeping when main power to the device is interrupted. The integration of the microelectromechanical systems (MEMS) resona- tor enhances the long-term accuracy of the device and reduces the piece-part count in a manufacturing line. The DS3231M is available in the same footprint as the popular DS3231 RTC. The RTC maintains seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator. Two programmable time-of- day alarms and a 1Hz output are provided. Address and data are transferred serially through an I2C bidirectional bus. A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures, to provide a reset output, and to automatically s
The DS3231M is a low‑cost, high‑accuracy I²C real‑time clock (RTC) that integrates a MEMS temperature sensor for temperature‑compensated timekeeping. It retains seconds, minutes, hours, weekday, date, month, and year information, supports 24‑hour and 12‑hour formats, and includes a square‑wave output for alarm or 1 Hz timing.
The datasheet details absolute maximum ratings, recommended operating conditions, electrical characteristics such as supply current, frequency tolerance, and I²C interface timing. Package information and pin descriptions are also provided for designers integrating the DS3231M into their circuits. This manual is written in Chinese.
| Supply Voltage (VCC) | +2.3 V to +5.5 V |
|---|---|
| Frequency Accuracy | ±0.432 seconds/day |
| I²C Clock Frequency (Fast Mode) | 400 kHz max |
| Active Supply Current | 200 µA (typical) |
The device requires a supply voltage between +2.3 V and +5.5 V.
The I²C interface supports up to 400 kHz in fast‑mode operation.
Its timekeeping accuracy is ±0.432 seconds per day (≈5 ppm).