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±5ppm, I²C Real-Time Clock with SRAM

Temperature-Compensated MEMS RTC Adds Memory in Smallest of Packages

Product Details

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 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 data sheet for more details.

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
Parametric specs for Timekeeping & Real-Time Clocks
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Simplified Block Diagram

DS3232M: Typical Operating Circuit DS3232M: Typical Operating Circuit Zoom icon

Design & Development

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Description

The DS3231MZ/DS3232M (DS323X) evaluation kit (EV kit) is a fully assembled and tested circuit board with an accompanying application program that demonstrates the operation of the DS3231M or DS3232M temperature-compensated real-time clocks. The DS3231M and DS3232M I2C real-time clocks contain an internal silicon (MEMS) resonator for its timekeeping reference. Both components constantly monitor the operating temperature, periodically adjusting the internal oscillator frequency to maintain highly accurate time information.
The EV kit includes one TCXO component soldered onto the demonstration board, a USB I/O communications module for evaluation kits (DS3900H2), and a CD containing the application program and instructions. System requirements are a Windows®-compatible PC running Windows XP®, Windows Vista®, or later, and a USB port. The EV kit allows for optional user configuration to a single power-supply operation, and the accompanying I2C interface and application program provides easy access to manipulate register settings, while observing the various component functions of timekeeping and real-time alarm-initiated interrupts.
The EV kit also allows the user to connect their I2C master to the sample component for operational verification and/or code generation.

View Details

Features

  • Aid to Fast Hardware and Software Debugging
  • GUI-Based Application for Ease of Use
  • Allows for User-Configurable Single- or Dual-Supply Operation
  • Optional Footprint Accepts 8-Pin or 16-Pin SO

Description

The DS3231MZ/DS3232M (DS323X) evaluation kit (EV kit) is a fully assembled and tested circuit board with an accompanying application program that demonstrates the operation of the DS3231M or DS3232M temperature-compensated real-time clocks. The DS3231M and DS3232M I2C real-time clocks contain an internal silicon (MEMS) resonator for its timekeeping reference. Both components constantly monitor the operating temperature, periodically adjusting the internal oscillator frequency to maintain highly accurate time information.
The EV kit includes one TCXO component soldered onto the demonstration board, a USB I/O communications module for evaluation kits (DS3900H2), and a CD containing the application program and instructions. System requirements are a Windows®-compatible PC running Windows XP®, Windows Vista®, or later, and a USB port. The EV kit allows for optional user configuration to a single power-supply operation, and the accompanying I2C interface and application program provides easy access to manipulate register settings, while observing the various component functions of timekeeping and real-time alarm-initiated interrupts.
The EV kit also allows the user to connect their I2C master to the sample component for operational verification and/or code generation.

View Details

Features

  • Aid to Fast Hardware and Software Debugging
  • GUI-Based Application for Ease of Use
  • Allows for User-Configurable Single- or Dual-Supply Operation
  • Optional Footprint Accepts 8-Pin or 16-Pin SO

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Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal

Parameters

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

Description

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 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 data sheet for more details.

Simplified Block Diagram

DS3232M: Typical Operating Circuit DS3232M: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal