Abracon AB08x5/AB18x5 Real-Time Clock Family

Abracon AB08x5/AB18x5 Real-Time Clock (RTC) Family feature power requirements as low as 15nA and a micro CMOS platform that is based on Abracon's innovative Sub-threshold Power-Optimized Technology (SPOT) by Ambiq Micro. These products include the AB08x5 Real-Time Clock Family and AB18x5 Real-Time Clock with Power Management Family. The clocks utilize on-chip oscillators to provide minimum power consumption and full RTC functions, including battery backup and programmable counters and alarms for timer and watchdog functions. They use either an I2C or SPI serial interface for communication with a host controller. Ideal applications include smart cards, wireless sensors and tags, medical electronics, utility meters, data loggers, appliances, and much more.


  • Sub-threshold power-optimized technology by Ambiq Micro
  • Ultra-low supply current:
    • <15nA with RC oscillator
    • <20nA with RC oscillator and autocalibration
    • <55nA with the crystal oscillator
  • Baseline time-keeping:
    • 32KHz 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 (32kHz to 1/year)
    • Countdown timer with repeat function
    • Automatic leap year calculation
  • Supports 3-wire and 4-wire SPI
  • 1.7V to 3.6V operating voltage
  • 1.5V to 3.6V clock and RAM retention voltage
  • Advanced time-keeping:
    • Integrated power-optimized RC oscillator
    • Advanced crystal calibration to ± 2ppm
    • Advanced RC calibration to ± 16ppm
    • Automatic calibration of RC oscillator to a crystal oscillator
    • Watchdog timer with hardware reset
    • Up to 256 bytes of general-purpose RAM
  • Power management features:
    • Automatic switchover to VBAT
    • External interrupt monitor
    • Programmable brown out detection
    • Programmable analog voltage comparator
  • I2C (up to 400kHz) or SPI (up to 2MHz) serial interface
  • -40°C to +85°C operating temperature range
  • All inputs are Schmitt trigger
  • 3mm x 3mm QFN-16 package


  • Smart cards
  • Wireless sensors and tags
  • Medical electronics
  • Utility meters
  • Data loggers
  • Appliances
  • Handsets
  • Consumer electronics
  • Communications devices
發佈日期: 2012-10-24 | 更新日期: 2022-03-11