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PRODUCT OF THE WEEK: Cymbet CBC921xx

PRODUCT OF THE WEEK: Cymbet CBC921xx

Real-Time Clock/Calendar with Power Manager and Battery Charger

The CBC921xx combines a real-time clock (RTC) with a backup battery charger and other power management features. In the event of an outage of the primary power source, automatic switchover to the backup battery enables extended timekeeping and optionally provides power to external devices to maintain their operation during the power outage.

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
Consumer appliances
Ultra-low power timer
Wireless sensors and RFID tags
Business and industrial systems