DATASHEET
ISL12022MA FN7575
Rev 5.00
September 5, 2012 Low Power RTC with Battery Backed SRAM, Integrated В±5ppm Temperature
Compensation and Auto Daylight Saving
The ISL12022MA 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. 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. VDD and Battery Status Monitors 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 Battery Resealв„ў Function to Extend Battery Shelf Life Power Status Brownout Monitor Time Stamp for Battery Switchover 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 …