1

®

FN6682.2

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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ISL12023

Real Time Clock with On Chip Temp Compensation ±5ppm

Low Power RTC with Battery-Backed SRAM

with Auto Daylight Saving

The ISL12023 device is a low power real time clock with an

embedded Temp sensor for oscillator compensation,

clock/calendar, power fail, low battery monitor, brownout

indicator, single periodic or polled alarms, intelligent

battery-backup switching, Battery Reseal™ function and 128

bytes of battery-backed user SRAM.

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.

Daylight Savings time adjustment is done automatically,

using parameters entered by the user. Power fail and battery

monitors offer user-selectable trip levels. A time stamp

Pinout

ISL12023

(14 LD TSSOP)

TOP VIEW

Features

• Real Time Clock/Calendar

- Tracks Time in Hours, Minutes and Seconds

- Day of the Week, Day, Month and Year

• On-chip Oscillator Compensation Over the Operating

Temp Range

- ±5ppm Over -40°C to +85°C

• 10-bit Digital Temperature Sensor Output

- ±2°C Accuracy

• Customer Programmable Day Light Saving Time

• Clock Output with 15 Selectable Frequencies

• 1 Alarm

- Settable to the Second, Minute, Hour, Day of the Week,

Day, or Month

- Single Event or Pulse Interrupt Mode

• Battery Reseal™ Function to Extend Battery Shelf Life

• Automatic Backup to Battery or Super Capacitor

- 1.0µA Battery Supply Current

• Battery Status Monitor

- 2 User Programmable Levels

- Seven Selectable Voltages for Each Level

• Power Status Brownout Monitor

- Six Selectable Trip Levels, from 2.295V to 4.675V

• Oscillator Failure Detection

• 128 Bytes Battery-Backed User SRAM

- 400kHz Clock Frequency

• 14 Ld TSSOP Package

• Pb-Free (RoHS Compliant)

Applications

• Utility Meters

• POS Equipment

• Medical Devices

• Security Systems

• Vending Machines

• White Goods

• Printers and Copiers

IRQ

SCL

SDA

X1

X2

2

3

4

5

13

12

11

GND

LVRST

NC

NC

NC

NC

1

6

7

8

9

10

14

Data Sheet

June 24, 2009