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    Parts    DS3231 / DS1307 RTC Family    DS3231M    DS3231M+
DS3231M

DS3231M

MPN: DS3231M+
Analog Devices / Maxim Integrated
Real Time Clock 5ppm, I2C Real-Time Clock
NRND1,036 in stock
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Overview

The DS3231M is a low-cost, extremely accurate I2C real-time clock (RTC) featuring a microelectromechanical systems (MEMS) resonator. It provides full calendar data including seconds, minutes, hours, day, date, month, and year with leap-year compensation. The MEMS resonator technology allows the device to operate with +/-5ppm accuracy over a wide temperature range without the need for an external crystal.

Why Choose This Part

The integrated MEMS resonator eliminates the need for external crystals and tuning capacitors, reducing PCB footprint and improving mechanical robustness. It offers high precision of +/-5ppm (+/-0.432 seconds/day) across the full industrial temperature range of -40C to +85C.

Applications

Utility Metering
Provides accurate time-stamping for energy, water, and gas meters where long-term drift must be minimized.
Industrial Controllers
Ideal for PLCs and industrial logging systems that operate in environments with high vibration or wide temperature swings.
Battery-Powered Instrumentation
Ensures precise timing in remote data loggers while consuming minimal power during backup mode.

Getting Started

Interface the device via the I2C bus at address 0x68 and provide a 3V lithium coin cell to the VBAT pin for backup power. Many engineers use the DS3231M with standard Arduino or CircuitPython libraries, though care should be taken to account for the MEMS-specific aging characteristics compared to the original DS3231 crystal version.

Also Consider

DS3231SN Analog Devices - This is the original TCXO version providing higher +/-2ppm accuracy for applications requiring the absolute highest precision.