ISL12022MA: Low Power RTC Module with Battery Backed SRAM, Integrated ±5ppm Temp Compensation and Crystal

The ISL12022MA device is a low power real time clock (RTC) with an embedded temperature sensor and crystal. Device functions include oscillator compensation, clock/calendar, power fail and low battery monitors, brownout indicator, one-time, periodic or polled alarms, intelligent battery backup switching, Battery Reseal™ function and 128 bytes of battery-backed user SRAM. Backup battery current draw is less than 1.6µA over the temperature range. The device is offered in a 20 Ld SOIC module that contains the RTC and an embedded 32.768kHz quartz crystal. The calibrated oscillator provides less than ±5ppm drift over the full -40°C to +85°C temperature range.

The RTC tracks time with separate registers for hours, minutes, and seconds. The calendar registers track date, month, year and day of the week and are accurate through 2099, with automatic leap year correction.

Daylight Savings time adjustment is done automatically, using parameters entered by the user. Power fail and battery monitors offer user-selectable trip levels. The time stamp function records the time and date of switchover from VDD to VBAT power, and also from VBAT to VDD power.

The ISL12022MA features enhanced immunity to ESD per the IEC61000-4-2 standard, and also provides improved resistance to system leakage related to environmental moisture.

Key Features
  • Embedded 32.768kHz Quartz Crystal in the Package
  • 20 Ld SOIC Package (for DFN version, refer to the ISL12020M)
  • Calendar
  • On-chip Oscillator Temperature Compensation
  • 10-bit Digital Temperature Sensor Output
  • 15 Selectable Frequency Outputs
  • Interrupt for Alarm or 15 Selectable Frequency Outputs
  • Automatic Backup to Battery or Supercapacitor
  • VDD and Battery Status Monitors
  • Battery Reseal™ Function to Extend Battery Shelf Life
  • Power Status Brownout Monitor
  • Time Stamp for Battery Switchover
  • 128 Bytes Battery-Backed User SRAM
  • 1.6µA Max Battery Current
  • I2C Bus™
  • RoHS Compliant
Applications
  • Utility Meters
  • POS Equipment
  • Printers and Copiers
  • Digital Cameras
Typical Diagram
Application Notes
TitleTypeUpdatedSizeOther Languages
AN1549: Addressing Power Issues in Real Time Clock ApplicationsPDF13 Nov 201469 KB
AN1744: ISL12022M Oscillator AccuracyPDF17 Oct 2014117 KB
Datasheets
TitleTypeUpdatedSizeOther Languages
ISL12022MA DatasheetPDF17 Nov 2014912 KB
Software
TitleTypeUpdatedSizeOther Languages
Real Time Clock (RTC) Evaluation Installer for Windows XP / Windows 7EXE31 Oct 20143.02 MB
Real Time Clock (RTC) Evaluation Installer for Windows 2000EXE31 Oct 20141.62 MB
Real Time Clock (RTC) Evaluation Installer for Windows 8EXE31 Oct 20147.85 MB
Tech Briefs
TitleTypeUpdatedSizeOther Languages
TB484: ISL12022MA Enhanced RTC ModulePDF19 Nov 201474 KB
User Guides
TitleTypeUpdatedSizeOther Languages
Real Time Clock USB Evaluation Board User GuidePDF12 May 2015487 KB
Miscellaneous
TitleTypeUpdatedSizeOther Languages
RTC WIN8 Preinstallation ProcedurePDF19 Nov 2014849 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
ISL12022MAIBZ20 Ld SOIC0.554201260RoHS
ISL12022MAIBZ-T20 Ld SOIC T+R0.554201260RoHS
ISL12022MA Datasheet 17 Nov 2014
20 Ld SOIC ISL8394
ISL12022MA
AN1549: Addressing Power Issues in Real Time Clock Applications 13 Nov 2014
AN1744: ISL12022M Oscillator Accuracy 17 Oct 2014
Real Time Clock (RTC) Evaluation Installer for Windows XP / Windows 7 31 Oct 2014
Real Time Clock (RTC) Evaluation Installer for Windows 2000 31 Oct 2014
Real Time Clock (RTC) Evaluation Installer for Windows 8 31 Oct 2014
TB484: ISL12022MA Enhanced RTC Module 19 Nov 2014
Real Time Clock USB Evaluation Board User Guide 12 May 2015
RTC WIN8 Preinstallation Procedure 19 Nov 2014