Overview

Support is limited to customers who have already adopted these products.

The ISL12028 device is a low power real time clock with clock/calendar, power-fail indicator, clock output and crystal compensation, two periodic or polled alarms (CMOS output), intelligent battery backup switching, CPU Supervisor, integrated 512x8-bit EEPROM configured in 16 bytes per page. The oscillator uses an external, low-cost 32. 768kHz crystal. The real-time clock tracks time with separate registers for hours, minutes and seconds. The device has calendar registers for date, month, year and day of the week. The calendar is accurate through 2099, with automatic leap year correction. The ISL12028 and ISL12028A Power Control Settings are different. The ISL12028 uses the Legacy Mode Setting, and the ISL12028A uses the Standard Mode Setting. Applications that have VBAT > VDD will require only the ISL12028A. Please refer to Power Control Operation on page 14 for more details. Also, please refer to I2C Communications During Battery Backup and LVR Operation on page 25 for important details.

ISL12028 Functional Diagram
ISL12028 Functional Diagram
  • Real Time Clock/Calendar
  • Tracks time in Hours, Minutes and Seconds
  • Day of the Week, Day, Month and Year
  • 3 Selectable Frequency Outputs
  • Two Non-Volatile Alarms
  • Settable on the Second, Minute, Hour, Day of the Week, Day, or Month
  • Repeat Mode (Periodic Interrupts)
  • Automatic Backup to Battery or SuperCap
  • Power Failure Detection
  • 800nA Battery Supply Current
  • On-Chip Oscillator Compensation
  • Internal Feedback Resistor and Compensation Capacitors
  • 64 Position Digitally Controlled Trim Capacitor
  • 6 Digital Frequency Adjustment Settings to ±30ppm
  • 512x8 Bits of EEPROM:
  • 16-Byte Page Write Mode (32 total pages)
  • 8 Modes of BlockLock™ Protection
  • Single Byte Write Capability
  • Data Retention: 50 years
  • Endurance: >2,000,000 Cycles Per Byte
  • CPU Supervisor Functions:
  • Power On Reset, Low Voltage Sense
  • Watchdog Timer (0.25s, 0.75s and 1.75s)
  • I2C Interface
  • 400kHz Data Transfer Rate
  • 14 Ld SOIC and 14 Ld TSSOP Packages
  • Pb-Free (RoHS Compliant)

Applications

  • Utility Meters
  • HVAC Equipment
  • Audio/Video Components
  • Modems
  • Network Routers, Hubs, Switches, Bridges
  • Cellular Infrastructure Equipment
  • Fixed Broadband Wireless Equipment
  • Pagers/PDA
  • POS Equipment
  • Test Meters/Fixtures
  • Office Automation (Copiers, Fax)
  • Home Appliances
  • Computer Products
  • Other Industrial/Medical/Automotive

Documentation

Design & Development

Software Downloads
Type Title Date
Software & Tools - Other
RTC WIN8 Preinstallation Procedure
PDF 846 KB
Library
Real Time Clock (RTC) Evaluation Installer for Windows 8
EXE 7.85 MB
Library
Real Time Clock (RTC) Evaluation Installer for Windows 2000
EXE 1.62 MB
Library
Real Time Clock (RTC) Evaluation Installer for Windows XP / Windows 7
EXE 3.02 MB
4 items

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Explore ECAD Models
Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Carrier Type
    MOQ
    Buy / Sample
    Part Number
    ISL12028IB27Z
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    		SOICN Tube 1000
    ISL12028IB27Z-T
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    		SOICN Reel 2500
    ISL12028IBZ
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    memory
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    		SOICN Tube 1000
    ISL12028IBZ-T
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    		SOICN Reel 2500
    ISL12028IV27Z
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    memory
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    		TSSOP Tube 960
    ISL12028IV27Z-T
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    		TSSOP Reel 2500
    ISL12028IVZ
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    view_in_ar
    		TSSOP Tube 960
    ISL12028IVZ-T
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    memory
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    		TSSOP Reel 2500
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