Cymbet CBC-EVAL-12-34813 Enerchipâ ¢ rtc evaluation kit Datasheet

Preliminary
CBC-EVAL-12-34813
EnerChip™ RTC Evaluation Kit
CBC34813 Real-Time Clock with Integrated Backup Power
System Features and Overview
CBC-EVAL-12-34813 is a demonstration kit featuring
the Cymbet CBC34813 EnerChip RTC - an integrated
surface mount device combining an Ambiq Micro
AM0813 Real-Time Clock (RTC), power management
circuit, and solid state rechargeable EnerChip
providing up to 100 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-12-34813 has the following elements:
•
•
•
•
•
•
Low power RTC with SPI-interface bus
Solid state rechargeable energy storage for realtime 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 shows the USB Interface Board to the left, and
the CBC34813 EnerChip RTC Tab Board to the right.
Figure 2: CBC-EVAL-12-34813 Demo Kit.
EVAL-12 Graphical User Interface
The CBC-EVAL-12-34813 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 CBC34813
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 CBC34813
5mm x 5mm QFN package on the CBC34813 Tab Board.
Smallest RTC Power Backup Footprint
Graphical User Interface
for Easy Application
Development!
The block diagram of Figure 1 illustrates the CBCEVAL-12-34813, an extremely compact low power
RTC with integrated backup power source.
Cymbet EnerChip and
Power Management
Solid state backup power
source with integrated
power management
5-pin computer
interface to
CBC34813
CBC34813
EnerChip RTC
AM0813
Real-Time Clock
USB interface
circuit and
connector
Figure 1: CBC-EVAL-12-34813 Block Diagram.
Full Access to RTC
Registers!
©2013 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
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CBC-EVAL-12-34813 EnerChip CC RTC Evaluation Kit
CBC-EVAL-12 Module Connector, Jumpers, and Test Points
J5
J3
J6
J4
Figure 3: Locations of Jumpers.
JUMPERS AND CONNECTORS
Jumper
J3
J4
J5
J6
Pin
Number
Designation
1
EXT ENERCHIP (+)
2
EXT ENERCHIP (-)
PCB Trace
RTC PWR - Cut jumper to disable RTC ‘PWR’ LED
1
GND
2
POWER
3
SPI-SCL
4
INT/
5
SPI-SDI
6
NC
7
SPI-SDO
8
NC
9
SPI-CE
10
NC
11
RESET/
12
EN
13
NC
14
FOUT
15
GND
16
POWER
PCB Trace
ENABLE - Cut jumper to enable/disable the CBC34813
charge pump
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CBC-EVAL-12-34813 EnerChip CC RTC Evaluation Kit
Getting Started
BEFORE inserting the USB dongle into the USB port, proceed with the file downloads as described below.
For first time users who have not installed the demonstration software, follow these steps:
1. Download the CBC-EVAL-12-34813 files from the web site and save them to your computer:
The directory structure loaded to your computer will look like the following:
2. Do not yet insert any hardware into the USB port. Launch the application by clicking on CDM20830_Setup.
3. A dialog box will appear, asking: “Do you want to allow the following program to make changes to this computer?” Click the ‘Yes’ option.
4. The following window will appear. Click ‘Extract.’
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CBC-EVAL-12-34813 EnerChip CC RTC Evaluation Kit
5. When the following window appears click ‘Next.’
6. Once the files have loaded, the following window will appear. Click ‘Finish.’ This installs the files pertaining to
the USB interface.
7. Next, launch the application by opening the setup file - as highlighted in the following diagram - located in the
directory.
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CBC-EVAL-12-34813 EnerChip CC RTC Evaluation Kit
8. When the following window appears, click ‘Next.’
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CBC-EVAL-12-34813 EnerChip CC RTC Evaluation Kit
9. When the following window appears, select an installation folder destination on your computer and click
‘Next.’
10. The following window will appear. Again, click ‘Next.’
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CBC-EVAL-12-34813 EnerChip CC RTC Evaluation Kit
11. The following window will appear. Allow the installation to continue and when the message “Do you want to
allow the following program from an unknown publisher to make changes to this computer?” appears, answer
‘Yes.’
12. Once the installation is complete, the following window will appear. Click ‘Close.’
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CBC-EVAL-12-34813 EnerChip CC RTC Evaluation Kit
13. There should now be an EVAL12 Demo Shortcut icon on your desktop, as shown below. Double-click on the
icon to launch the Graphical User Interface (GUI).
GUI installation is now complete. The following window should appear.
14. Insert the CBC-EVAL-12-34813 dongle into the USB port. It can take up to a minute for the computer to
recognize the new hardware.
15. Both red LEDs on the EVAL stick - one on the USB board and the other on the Tab Board - should be lit.
Click the ‘Connect’ button on the GUI. The computer’s system time should now appear active in the GUI. At the
top right of the window, ‘CBC-TAB-34813 Found’ is indicated, along with ‘Messages: RTC Connected’ at the
top left.
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CBC-EVAL-12-34813 EnerChip CC RTC Evaluation Kit
CBC-TAB-34813 Found
16. Click ‘RTC EC Power’ to disable power from the dongle. The ‘RTC EC Power’ indicator on the GUI will turn off,
as will the ‘PWR’ LED on the CBC34813 Tab Board. Click ‘RTC EC Power’ to again apply power to the dongle.
17. There are several configuration options available to the user from the ‘RTC Control’ menu. To view the
available options, open the ‘RTC Control’ drop-down menu and select from the 3 options as shown below.
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CBC-EVAL-12-34813 EnerChip CC RTC Evaluation Kit
18. The ‘Set RTC Date/Time’ option allows the user to set a specific date and time. Enter any arbitrary date and
time as the starting time, using either the drop-down calendar menu, or by manually entering the data. Click
‘OK’ to execute the command.
CBC-TAB-34813 Found
The ‘RTC Count Down Timer’ option allows the user to apply a value from 0 to 255 in ‘Secs’ field.
CBC-TAB-34813 Found
19. Enter a valid number and click ‘OK’ to execute the command. The timer will then be set and begin to count
down to zero.
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CBC-EVAL-12-34813 EnerChip CC RTC Evaluation Kit
CBC-TAB-34813 Found
20. The system set-up is now complete. Once the countdown timer or date and time have been set, the
integrated EnerChip battery can be used to maintain the timer or real time by either disabling power from the
dongle by clicking the ‘RTC EC Power’ button or removing the dongle from the USB port. In the absence of USB
power, the EnerChip will provide power to the AM0813 RTC for up to 100 hours. Simply re-insert the dongle or
re-apply power to verify that the countdown timer or time and date were maintained while the dongle was not
under USB power.
RTC Register Access
The AM0813 registers are also accessible through the EVAL-12 GUI. Select the ‘Show RTC Registers’ option to
view and modify the RTC register settings as shown below.
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CBC-EVAL-12-34813 EnerChip CC RTC Evaluation Kit
From this window, click on the ‘Get Registers’ box to reveal the bit settings. An example of the register map is
shown in the following window.
To adjust the registers, click on either the ‘Bit Set’ or ‘Bit Reset’ box in the lower left corner of the register map,
window then click on the field in one of the ‘Bit’ columns to set or reset, respectively, that register bit. When
finished setting the register fields, click the ‘Set Register’ button in the lower right corner of the window.
When finished using the CBC-EVAL-12-34813, click the ‘RTC EC Power’ button in the main GUI window to turn
off power to the module. Then click on the ‘Disconnect’ button and remove the USB dongle from the computer.
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CBC-EVAL-12-34813 EnerChip CC RTC Evaluation Kit
Reference Documents
CBC34813 EnerChip RTC Data Sheet: http://www.cymbet.com/pdfs/DS-72-38.pdf .
Ambiq Micro Real-Time Clock Data Sheet: http://ambiqmicro.com
Guidelines for crystal selection and other important information pertaining to the AM0813: http://ambiqmicro.
com/resource-center/
CBC-EVAL-12-34813 Circuit Schematic
The schematic of Figure 4 depicts the CBC-EVAL-12-34813 RTC board. For the purpose of supporting hardware
development, CBC34813 package pins are accessible by way of through-hole vias 1-16 of J5 on the Tab Board.
Additional backup run time is supported by connecting external EnerChips to the CBC34813 by way of throughhole vias 1-2 of J3.
Figure 4: CBC-EVAL-12-34813 EnerChip RTC Board Circuit Schematic.
Table 1: CBC-EVAL-12-34813 EnerChip RTC Board Bill of Materials.
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CBC-EVAL-12-34813 EnerChip CC RTC Evaluation Kit
CBC-EVAL-12 Assembly Diagrams
Figure 5: CBC-EVAL-12-34813 EnerChip RTC Board Assembly Diagram (Top View).
Figure 6: CBC-EVAL-12-34813 EnerChip RTC Board Assembly Diagram (Bottom View).
Ordering Information
EnerChip Part Number
CBC34813-M5C
CBC-EVAL-12-34813
CBC-TAB-34813
Description
EnerChip RTC SPI 5uAh 0813 5x5 QFN
-20-70C
EnerChip RTC CBC34813 Evaluation Kit
USB and RTC Tab Board
Notes
Tube
EnerChip EVAL-12 CBC34813 Tab Board
Disclaimer of Warranties; As Is
The information provided in this data sheet is provided “As Is” and Cymbet Corporation disclaims all representations or warranties of any
kind, express or implied, relating to this data sheet and the Cymbet battery product described herein, including without limitation, the
implied warranties of merchantability, fitness for a particular purpose, non-infringement, title, or any warranties arising out of course of
dealing, course of performance, or usage of trade. Cymbet battery products are not approved for use in life critical applications. Users shall
confirm suitability of the Cymbet battery product in any products or applications in which the Cymbet battery product is adopted for use and
are solely responsible for all legal, regulatory, and safety-related requirements concerning their products and applications and any use of
the Cymbet battery product described herein in any such product or applications.
Cymbet, the Cymbet Logo and EnerChip are trademarks of Cymbet Corporation. All Rights Reserved.
EnerChip products and technology are covered by one or more patents or patents pending.
©2013 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
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