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DS-72-35 V0.7

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CBC-EVAL-12-34123

System Features and Overview

CBC-EVAL-12-34123 is a demonstration kit featuring

the Cymbet CBC34123 EnerChip RTC - an integrated

surface mount device combining an NXP PCF2123

Real-Time Clock (RTC), power management circuit,

and solid state rechargeable EnerChip providing 30

hours of backup power to the RTC.

The kit demonstrates just how compact an RTC with

integrated backup power can be using the low profile

surface mount device from Cymbet. The combined

CBC-EVAL-12-34123 has the following elements:

• Low power RTC with SPI-interface bus

• Solid state rechargeable energy storage for real-

time clock backup power

• Power fail detect with automatic switchover from

main power to integrated backup power source

• Integrated battery management that controls

battery charging and discharge cutoff, ensuring

maximum service life of the on-board storage cell

• USB connector for easy demonstration and

application development on personal computer

• Input/output access to board for easy connection

to external microcontroller

Figure 2: CBC-EVAL-12-34123 Demo Kit.

Preliminary

EnerChip™ RTC Evaluation Kit

Real-Time Clock with Integrated Backup Power

Figure 1: CBC-EVAL-12-34123 Block Diagram.

Smallest RTC Power Backup Footprint

The block diagram of Figure 1 illustrates the CBC-

EVAL-12-34123, an extremely compact low power

RTC with integrated backup power source.

EVAL-12 Graphical User Interface

The CBC-EVAL-12-34123 includes a PC-based software

application that communicates with the USB stick.

Users can set the time of day, date, and countdown

timer values to experiment with RTC power-back-up.

The application also allows the user access to the RTC

registers for viewing and modification. The software

works with Microsoft Windows XP, Windows 7, and

Windows 8 operating systems. Once the EVAL-12 USB

stick is inserted into the PC, the Connect button is

clicked in the GUI to establish communication over the

USB port. The entire USB stick or just the CBC34123

Tab Board can then be removed from the PC and the

RTC will be powered by the EnerChip rechargeable solid

state battery that is integrated within the CBC34123

5mm x 5mm QFN package on the CBC34123 Tab Board.

Figure 2 shows the USB Interface Board to the left, and

the CBC34123 EnerChip RTC Tab Board to the right.

Cymbet EnerChip and

Power Management

Solid state backup power

source with integrated

power management

USB interface

circuit and

connector

NXP PCF2123

Real-Time Clock

CBC34123

EnerChip RTC

5-pin computer

interface to

CBC34123

Full Access to RTC

Registers!

Graphical User Interface

for Easy Application

Development!