DATASHEET
ISL12022M FN6668
Rev 9.00
June 20, 2012 Low Power RTC with Battery Backed SRAM, Integrated В±5ppm Temperature
Compensation and Auto Daylight Saving
The ISL12022M 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 batterybacked user SRAM. Backup battery current draw is less than
1.6ВµA over the temperature range. 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. Features 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. Automatic Backup to Battery or Supercapacitor 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
function records the time and date of switchover from VDD to
VBAT power, and also from VBAT to VDD power. Related Literature Embedded 32.768kHz Quartz Crystal in the Package 20 Ld SOIC Package (for DFN version, refer to the …