DS3231 RTC Module

DS3231 serial real-time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. Address and data are transferred serially through an I²C, bidirectional bus. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month date 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 AM/PM indicator. The DS3231 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply. Timekeeping operation continues while the part operates from the backup supply.

Technical Specification

• RTC counts seconds, minutes, hours and year
• Accuracy: +2ppm to -2ppm for 0ºC to +40ºC , +3.5ppm to -3.5ppm for -40ºC to +85ºC
• Digital temperature sensor with ±3ºC accuracy
• Two Time-of-day alarms
• Programmable square wave output
• Register for Aging trim
• 400Khz I2C interface
• Low power consumption
• Automatic power failure battery switch circuitry
• CR2032 battery backup with two to three year life
• Portable size