AB18X5 Real-Time Clock with Power Management Family Date of Issue: October 16, 2014 3.0 x 3.0 mm Page 1 of 37 Abracon Drawing 453568 Revision: C 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 week- Applications day - Alarm capability on all counters Smart cards - Programmable output clock generation Wireless sensors and tags (32.768 kHz to 1 year) Medical electronics - Countdown timer with repeat function Utility meters - Automatic leap year calculation Data loggers Advanced timekeeping features: Appliances - Integrated power optimized RC oscillator Handsets - Advanced crystal calibration to 2 ppm Consumer electronics - Advanced RC calibration to 16 ppm Communications equipment - Automatic calibration of RC oscillator to crystal oscillator Description - Watchdog timer with hardware reset The ABRACON AB18X5 Real-Time Clock with - 256 bytes of general purpose RAM Power Management family provides a Power management features: groundbreaking combination of ultra-low power - Integrated ~1 power switch for off-chip com- coupled with a highly sophisticated feature set. With ponents such as a host MCU power requirements significantly lower than any - System sleep manager for managing host pro- other industry RTC (as low as 14 nA), these are the cessor wake/sleep states TM - External reset signal monitor first semiconductors based on innovative SPOT - Reset output generator (Subthreshold Power Optimized Technology) CMOS - Supercapacitor trickle charger with program- platform. The AB18X5 includes on-chip oscillators to mable charging current provide minimum power consumption, full RTC - Automatic switchover to VBAT functions including battery backup and - External interrupt monitor programmable counters and alarms for timer and - Programmable low battery detection threshold 2 watchdog functions, and either an I C or SPI serial - Programmable analog voltage comparator interface for communication with a host controller. An 2 I C (up to 400 kHz) and 3-wire or 4-wire SPI (up integrated power switch and a sophisticated system to 2 MHz) serial interfaces available sleep manager with counter, timer, alarm, and Operating voltage 1.5-3.6 V interrupt capabilities allows the AB18X5 to be used Clock and RAM retention voltage 1.5-3.6 V as a supervisory component in a host microcontroller Operating temperature 40 to 85 C based system. All inputs include Schmitt Triggers 3x3 mm QFN-16 package Disclaimer: AB18X5 series of devices are based on innovative SPOT technology, proprietary to Ambiq Micro.AB18X5 Real-Time Clock with Power Management Family Date of Issue: October 16, 2014 3.0 x 3.0 mm Page 2 of 37 Abracon Drawing 453568 Revision: C 1. Family Summary The AB18X5 family consists of several members (see Table 1). All devices are supplied in a standard 3x3 mm QFN-16 package. Members of the software and pin compatible AB08X5 RTC family are also listed. Table 1: Family Summary Baseline Advanced Timekeeping Power Management Timekeeping Part Calib/ Interface Number Power XT RC Auto- Watch- RAM VBAT Reset Ext of GP Switch and Osc Osc calib dog (B) Switch Mgmt Int Outputs Sleep FSM 2 AB1805 4 256 I C AB1815 3 256 SPI Software and Pin Compatible AB08X5 Family Components 2 AB0805 3 256 I C AB0815 2 256 SPI