ISL12022IBZ-T7A【PDF 1/29 页】IC RTC/CALENDAR TEMP SNSR 8SOIC

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

Intersil (and design) and Battery Reseal are trademarks owned by Intersil Corporation or one of its subsidiaries.

I2C Bus is a trademark owned by NXP Semiconductors Netherlands, B.V. All other trademarks mentioned are the property of their respective owners.

Low Power RTC with Battery-Backed SRAM and

Embedded Temp Compensation ±5ppm with Auto

Daylight Saving

ISL12022

The ISL12022 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

function records the time and date of switchover from VDD to

VBAT power, and also from VBAT to VDD power.

Applications

Utility Meters

POS Equipment

Medical Devices

Security Systems

Vending Machines

White Goods

Printers and Copiers

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

Temperature Range

- ±5ppm Over -40°C to +85°C

10-bit Digital Temperature Sensor Output

- ±2°C Accuracy

Customer Programmable Day Light Saving Time

15 Selectable Frequency Outputs

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

-Operation to VBAT = 1.8V

- 1.0A 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

Time Stamp for First VDD to VBAT, and Last VBAT to VDD

128 Bytes Battery-Backed User SRAM

I2C Bus

- 400kHz Clock Frequency

1A Typical Battery Current

Pb-Free (RoHS Compliant)

FIGURE 1. TYPICAL APPLICATION CIRCUIT

DBAT

CBAT

CIN

BAT43W

0.1F

VDD = 2.7V

TO 5.5V

VBAT = 1.8V

TO 3.2V

JBAT

ISL12022

VDD

GND

VBAT

November 22, 2011

FN6659.3

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