DATASHEET
ISL12020M FN6667
Rev 6.00
January 9, 2015 Low Power RTC with Battery Backed SRAM, Integrated В±5ppm Temperature
Compensation and Auto Daylight Saving Features The ISL12020M 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 DFN module that contains the RTC and an embedded
32.768kHz quartz crystal. The calibrated oscillator provides
less than В±5ppm drift across the 0В°C to +85В°C temperature
range. Embedded 32.768kHz quartz crystal in the package 20 Ld DFN package (for SOIC version, refer to the
ISL12022M) Calendar On-chip oscillator temperature compensation 10-bit digital temperature sensor output 15 selectable frequency outputs Interrupt for alarm or 15 selectable frequency outputs 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 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
function records the time and date of switchover from VDD to
VBAT power and also from VBAT to VDD power. Power status brownout monitor Time stamp for battery switchover 128 Bytes battery-backed user SRAM I2C-Busв„ў Related Literature RoHS compliant AN1549, “Addressing Power Issues in Real Time Clock …