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DS3231M: ±5ppm, I2C Real-Time Clock Data Sheet (Rev. 7)3/19/2015PDF890K
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• DS3231M: Errata Sheet
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DS3231M
±5ppm, I2C Real-Time Clock
Industry's First Temperature-Compensated RTC with Internal MEMS Resonator Reduces Crystal Mechanical Failure Susceptibility
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Overview
Features and Benefits
- Highly Accurate RTC With Integrated MEMS Resonator Completely Manages All Timekeeping Functions
- Complete Clock Calendar Functionality Including Seconds, Minutes, Hours, Day, Date, Month, and Year, with Leap-Year Compensation Up to Year 2100
- Timekeeping Accuracy ±5ppm (±0.432 Second/Day) from -45°C to +85°C
- Footprint and Functionally Compatible to DS3231
- Two Time-of-Day Alarms
- 1Hz and 32.768kHz Outputs
- Reset Output and Pushbutton Input with Debounce
- Digital Temp Sensor with ±3°C Accuracy
- +2.3V to +5.5V Supply Voltage
- Simple Serial Interface Connects to Most Microcontrollers
- Fast (400kHz) I2C Interface
- Battery-Backup Input for Continuous Timekeeping
- Low Power Operation Extends Battery-Backup Run Time
- Operating Temperature Range: (-40°C to +85°C)
- 8-Pin or 16-Pin SO Packages
- Underwriters Laboratories® (UL) Recognized
Product Details
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) resonator 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 active-low 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 switch to the backup supply when necessary. Additionally, the active-low RST pin is monitored as a pushbutton input for generating a microprocessor reset. See the Block Diagram in the full data sheet for more details.
Applications
- Industrial Applications
- Power Meters
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (3)
Documentation & Resources
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DS3231M Reliability Data1/12/2023PDF123K
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Implementing Flawless Designs with Accurate I²C Real-Time Clocks4/20/2012
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Feature Comparison of the DS323x Real-Time Clocks9/23/2011
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Selecting a Backup Source for Real-Time Clocks5/26/2006
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Power Considerations for Accurate Real-Time Clocks11/4/2005
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Interfacing a DS3231 with an 8051-Type Microcontroller5/23/2005
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Design Considerations for Maxim Real-Time Clocks2/15/2002
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The What, Why, When, Where and How of Real-Time Clocks (RTCs)1/22/2019
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Industry Turns to MEMS for Accurate Real-Time Clocks3/10/2015
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Tips for Writing Bulletproof Real-Time Clock Control Code3/28/2014
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MEMS Technology Provides Tangible Benefits for Real-Time Clocks5/20/2013
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Stuxnet and Other Things that Go Bump in the Night10/23/2012
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State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks9/17/2012
Reference Designs (1)
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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DS3231M Discussions
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.