DS-72-35 Datasheet, PDF (1/14 Pages) Cymbet Corporation – EnerChip™ RTC Evaluation Kit

Preliminary
CBC-EVAL-12-34123
EnerChip™ RTC Evaluation Kit
Real-Time Clock with Integrated Backup Power
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
solution occupies only 0.25 cm² of board space.
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
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.
Figure 2 shows the USB Interface Board to the left, and
the CBC34123 EnerChip RTC Tab Board to the right.
Figure 2: CBC-EVAL-12-34123 Demo Kit.
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.
Graphical User Interface
for Easy Application
Development!
Cymbet EnerChip and
Power Management
Solid state backup power
source with integrated
power management
CBC34123
EnerChip RTC
NXP PCF2123
Real-Time Clock
5-pin computer
interface to
CBC34123
USB interface
circuit and
connector
Figure 1: CBC-EVAL-12-34123 Block Diagram.
Full Access to RTC
Registers!
©2013 Cymbet Corporation • Tel: [phone] • www.cymbet.com
DS-72-35 V0.7
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