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Preliminary
CBC921 PMRTC NPerwoduct!
Data Brief
Real-Time Clock/Calendar with Power Manager and Battery Charger
Features
• Ultra-low power Real-Time Clock (RTC) with power-fail detect and battery management
• Low power timer and power manager extend run time in battery-powered systems
• Controls 4.1V rechargeable micro-batteries and 3.2V rechargeable coin cells and supercaps; no off-chip components required for battery charger
• Buck charge pump supply extends backup battery life:
20nA RTC using internal RC oscillator 50nA RTC using crystal oscillator • Counters for hundredths, seconds, minutes,
hours, date, month, year, century, and weekdays based on a 32.
CBC921 Datasheet
