The ISL12022IBZ-T 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.
Feature
Tracks Time in Hours, Minutes and Seconds
Day of the Week, Day, Month, and Year
On-chip Oscillator Compensation Over the Operating Temperature Range
10-bit Digital Temperature Sensor Output
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
Battery Status Monitor
Power Status Brownout Monitor
Oscillator Failure Detection
Time Stamp for First VDD to VBAT, and Last VBAT to VDD
128 Bytes Battery-Backed User SRAM
I2C Bus™
1µA Typical Battery Current
Pb-Free (RoHS Compliant)
APPLICATIONS
Utility Meters
POS Equipment
Medical Devices
Security Systems
Vending Machines
White Goods
Printers and Copiers
Catalogue
FPGA / CPLD
Memory
MOS 
MCU 
DSP
OCEP
Secondary 
Other 
