DS3231 Real-Time Clock in a 16-pin 30 mm SO package Temperature ranges: commercial and industrial Key features - Precise timekeeping: stores seconds, minutes, hours, day of week, date, and year; automatic month-end adjustment for months with less than 31 days, including leap year handling - Reset and control: the INT/SQW monitor pin can be used as a manual input to generate an MP reset - Integrated temperature sensor: a digital temperature sensor accessible via I2C (along with time); sensor accuracy is ±3°C - Tcxo and crystal: high-precision I2C real-time clock with an integrated temperature-compensated crystal oscillator and quartz - Battery backup: battery input maintains timing when mains power is interrupted - Reduced parts count: integrated crystals improve device life and simplify production - Flexible time formats: 24-hour or 12-hour format with AM/PM display - Alarms and output: programmable calendar alarms and a programmable square wave output - Interface and protection: address and data transmitted serially via bidirectional I2C bus - Power monitoring: temperature-compensated voltage reference and comparator monitor Vcc, detect power supply failures, provide a reset output, and automatically switch to emergency power when needed Applications and use scenarios - Industrial automation and control systems requiring reliable time stamps and calendar alarms with power-failure resilience - Data loggers and environmental monitoring that need accurate timekeeping and onboard temperature data - Embedded systems and consumer devices that require a compact, low-component RTC with back-up timing and flexible alarm options