AB1803

AB08XX Real-Time Clock Family Date of Issue: November 7, 2013 3.0 x 3.0 mm Page 1 of 34 Abracon Drawing #453567 Revision : A 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 - Up to 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 ...