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CBC34803 Datasheet(PDF) 1 Page - Cymbet Corporation |
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CBC34803 Datasheet(HTML) 1 Page - Cymbet Corporation |
1 / 9 page ©2013 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com DS-72-34 V.09 Page 1 of 9 I2C Real-Time Clock/Calendar with Integrated Backup Power CBC34803 EnerChip™ RTC Features • Ultra low power Real Time Clock with Integrated rechargeable EnerChip™ solid state battery, power-fail detect and automatic switchover, providing greater than 6 days of RTC backup • 5mm x 5mm x 1.4mm QFN package is the smallest commercially available RTC having integrated backup power • Temperature-compensated charge control • Integrated EnerChip™ recharged at VDD > 2.5V • SMT assembly - lead-free reflow solder tolerant • Counters for hundredths, seconds, minutes, hours, date, month, year, century, and weekday based on a 32.768 kHz oscillator • Automatic leap year calculation • Alarm capability on all counters • 2 general purpose outputs • 64 bytes of RAM • Advanced crystal calibration to ± 2 ppm • Advanced RC calibration to ± 16 ppm • Automatic calibration of RC oscillator to crystal oscillator • I2C-bus (up to 400kHz) • Eco-friendly, RoHS compliant - tested General Description The EnerChip RTC CBC34803-M5C combines a Real-Time Clock (RTC) and calendar optimized for low power applications with an integrated rechargeable solid state backup battery and all power management functions. The EnerChip RTC ensures a seamless transition from main power to backup power in the event of power loss. The integrated power management circuit ensures thousands of charge-discharge cycles from the integrated EnerChip and manages battery charging, discharge cutoff, power switchover, and temperature compensation to maximize the service life of the device. The CBC34803 provides greater than 6 days of backup time in the event main power is interrupted. The integrated EnerChip recharges quickly, has extremely low self-discharge, is non-flammable, and RoHS- compliant. The EnerChip is charged automatically anytime VDD is above 2.5V. Data is transferred serially via an I2C-bus. Alarm and timer functions provide the option to generate a wake-up signal on an interrupt pin. 5mm x 5mm x 1.4mm 16-pin QFN Package 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 Timers using only 35nA can be implemented with the CBC34803 • Wireless sensors and RFID tags and other powered, low duty cycle applications. • Business and industrial systems such as: network routers, point-of-sale terminals, single- board computers, test equipment, multi-function printers, industrial controllers, and utility meters. • Time keeping application • Battery powered devices • Metering • High duration timers • Daily alarms • Low standby power applications Preliminary Figure 1: CBC34803 Pin-out Diagram VCAP |
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