±5ppm, I²C Real-Time Clock with SRAM

 

Part Number	Replacement	Explanation

Description

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The DS3232M is a low-cost, extremely accurate, I²C real-time clock (RTC) with 236 bytes of battery-backed SRAM. 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 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 V_CC 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 data sheet for more details.

DS3232M: Typical Operating Circuit Enlarge+

Key Features

• Timekeeping Accuracy ±5ppm (±0.432 Second/Day) from -40°C to +85°C
• 236 Bytes of Battery-Backed User SRAM
• Battery Backup for Continuous Timekeeping
• Low Power Consumption
• Functionally Compatible to DS3232
• Complete Clock Calendar Functionality Including Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Up to Year 2100
• Two Time-of-Day Alarms
• 1Hz and 32.768kHz Outputs
• Reset Output and Pushbutton Input with Debounce
• Fast (400kHz) I²C-Compatible Serial Bus
• +2.3V to +4.5V Supply Voltage
• Digital Temp Sensor with ±3°C Accuracy
• -40°C to +85°C Temperature Range
• 8-Pin SO (150 mils) Package
• Underwriters Laboratories (UL) Recognized

Applications/Uses

• Building Automation
• High-Definition Video Security
• Industrial Application
• Power Meters