The CMOS bq3285LF is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. The architecture is based on the bq3285 RTC with added features: century bit, low-voltage operation, 32.768kHz output, 126 additional bytes of CMOS, two shadow registers of last address used, and a day-of-month alarm to be compliant with the ACPI RTC specification.