CBC34123 is a Real-Time Clock (RTC) and calendar optimized for low power applications and includes a rechargeable solid state backup power source and all power management functions necessary to ensure 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 storage device – the EnerChip – and manages battery charging, discharge cutoff, power switchover, and temperature compensation to maximize the service life of the device.

Data is transferred serially via a Serial Peripheral Interface (SPI-bus) with a maximum data rate of 6.25 Mbit/s. An alarm and timer function is also available providing the possibility to generate a wake-up signal on an interrupt pin. An offset register allows fine tuning of the clock.

With the industry’s lowest RTC backup operating current consumption, the integrated 5µAh EnerChip provides >30 hours of backup time in the event main power is interrupted. The EnerChip has extremely low self-discharge, recharges quickly, is non-flammable, and RoHS-compliant. The EnerChip is charged automatically anytime VDD is above 2.5V.

The CBC34123 is the smallest commercially available devcie that includes RTC clock/calendar functionality with integrated backup power. The CBC34123 is available in a 5mm x 5mm x 0.9mm surface mount Land Grid Array (LGA) module in a 16-QFN configuration.

The CBC34123 is a 16-pin, 5 mm x 5 mm Quad Flat Nolead (QFN) package, available in tubes, trays, or tapeand-reel for use with automatic insertion equipment.

EnerChip RTC lasts the life of the system so you never have to change a battery. EnerChip RTC devices provide powerful single chip drop-in capabilities in the world’s smallest footprint.
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  • Real time clock provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
    Resolution: seconds to years
  • Watchdog functionality
  • Freely programmable timer and alarm with interrupt capability
  • Clock operating voltage: 1.1 V to 5.5 V
  • 3 line SPI-bus with separate, but combinable data input and output
  • Serial interface at VDD = 1.8 V to 5.5 V
  • 1 second or 1 minute interrupt output
  • Integrated oscillator load capacitors for CL = 7 pF
  • Internal Power-On Reset (POR)
  • Open-drain interrupt and clock output pins
  • Programmable offset register for frequency adjustment
  • Integrated 5µAh Rechargeable Solid State Battery with power manager
  • Temperature Compensated Charge Control
  • Integrated EnerChip Recharged at VDD as Low as 2.5V
  • SMT – Lead-Free Reflow Tolerant
  • Eco-Friendly, RoHS Compliant – tested

Physical Properties

Package size: 5 mm x 5 mm
Operating temperature: -20°C to +70°C
Storage temperature: -40°C to +125°C

Electrical Properties

Output voltage: 3.3V
Capacity (typical): 5µAh
Recharge time to 80%: 15 minutes
Charge/Discharge cycles: >5000 to 10% discharge


  • Wireless sensors and RFID tags and other powered, low duty cycle 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.
  • 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
  • Energy Harvesting by coupling the EnerChip with energy transducers such as solar panels.
  • Time keeping applications
  • Battery powered devices
  • Metering
  • High duration timers
  • Daily alarms
  • Low standby power applications

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