CBC921 Overview
The CBC921xx bines a real-time clock (RTC) with a backup battery charger and other power management.
CBC921 Key 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 ponents required
- Buck charge pump supply extends backup battery life
- Counters for hundredths, seconds, minutes
- 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 pensation
CBC921 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