DATASHEET
ISL12022MR5421 FN7576
Rev 3.00
June 7, 2012 Low Power RTC with Battery Backed SRAM, Integrated В±5ppm Temperature
Compensation and Auto Daylight Saving
The ISL12022MR5421 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 Resealв„ў function and 128
bytes of battery-backed user SRAM. 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 В±5ppm drift over the full -40В°C to +85В°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. 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 Resealв„ў Function to Extend Battery Shelf Life 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 …
