Real-Time Clock/Calendar
Description
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.
768KHz crystal oscillator or internal RC oscillator • Automatic leap year calculation • Alarm capability on all counters • Two configurable multi-use outputs for interrupts, output clock, and managing sleep mode of external devices • 64 bytes of RAM • Internal temperature measurement with 10-bit ADC enables oscillator temperature compensation • Advanced crystal calibration to ± 1 ppm • Ultra-low Iq VIN POR circuit (< 25nA) • Fixed indicators for PGOOD, charging current on, and charging disabled • Temperature range -40°C to +85°C
Applications
• Power bridging to provide uninterruptible RTC function during exchange of main batteries.
• Consumer appliances that have real-time clocks; provides switchover power from main supply to backup battery.
• Ultra-Low Power Timer using only 20nA • Wireless sensors and RFID tags and other
powered, low duty cycle applications.
• Business and industrial systems such as:
network routers, point-of-sale terminals, singleboard computers, test equipment, multi-function printers, industrial controllers, and utility meters.
• Reliable system timekeeping • Battery-powered devices • Internet of Things, portable devices • Daily alarms
CBC92141C
3mm x 3mm x 0.
5mm 16-pin MLPQ Package
General Description
The CBC921xx combines a real-time clock (RTC) with a backup b...
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