Description
The ABRACON AB08X5 Real-Time Clock family provides a groundbreaking combination of ultra-low power coupled with a highly sophisticated feature set. With power requirements significantly lower than any other industry RTC (as low as 14 nA), these are the first semiconductors based on innovative SPOTTM (Subthreshold Power Optimized Technology) CMOS platform. The AB08X5 includes on-chip oscillators to provide minimum power consumption, full RTC functions including battery backup and programmable counters and alarms for timer and watchdog functions, and either an I2C or SPI serial interface for communication with a host controller.

FEATUREs
• Ultra-low supply current (all at 3V):
   - 14 nA with RC oscillator
   - 22 nA with RC oscillator and Autocalibration
   - 55 nA with crystal oscillator
• Baseline timekeeping features:
   - 32.768 kHz crystal oscillator with integrated
      load capacitor/resistor
   - Counters for hundredths, seconds, minutes,
      hours, date, month, year, century, and weekday
   - Alarm capability on all counters
   - Programmable output clock generation
      (32.768 kHz to 1 year)
   - Countdown timer with repeat function
   - Automatic leap year calculation
• Advanced timekeeping features:
   - Integrated power optimized RC oscillator
   - Advanced crystal calibration to ± 2 ppm
   - Advanced RC calibration to ± 16 ppm
   - Automatic calibration of RC oscillator to crystal
      oscillator
   - Watchdog timer with hardware reset
   - 256 bytes of general purpose RAM
• Power management features:
   - Automatic switchover to VBAT
   - External interrupt monitor
   - Programmable low battery detection threshold
   - Programmable analog voltage comparator
• I2C (up to 400 kHz) and 3-wire or 4-wire SPI (up
   to 2 MHz) serial interfaces available
• Operating voltage 1.5-3.6 V
• Clock and RAM retention voltage 1.5-3.6 V
• Operating temperature –40 to 85 °C
• All inputs include Schmitt Triggers
• 3x3 mm QFN-16 package

APPLICATIONs
• Smart cards
• Wireless sensors and tags
• Medical electronics
• Utility meters
• Data loggers
• Appliances
• Handsets
• Consumer electronics
• Communications equipment