AN-1036: EnerChip™ CC in EH Designs

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AN-72-1036 Rev A

Page 7 of 7

Thus, the input power from the PV cell, less any conversion losses, must be greater than 65.5uW, assuming the

PV cell is illuminated continuously. If less power is available, the duty cycle of the EnerChip CC charge pump will

decrease proportionally, effectively decreasing the load to the PV cell as its output power drops in response to

a lower ambient light level.

When no ambient power is available, the EnerChip CC consumes only 40nA (to power the EnerChip cutoff

circuit), resulting in an average system power consumption of:

65.5uW - 49.5uW + 132nW = 16uW.

Supposing the system operates in battery-backed mode for 12 hours per day, the total energy storage capacity

required is:

16uW x 12 hours x 3600 sec./hour = 0.69 Joules.

Two EnerChips rated at 50uAh each will deliver power to the circuit for 12 hours when discharged to a 50%

state-of-charge.

Using the EVAL-10 EnerChip CC Solar Energy Harvesting Eval Kit and Support

The Cymbet CBC-EVAL-10 Evaluation Kit can be used to easily prototype the circuit shown in Figure 5.

Information on the EVAL-10 can be found at http://www.cymbet.com/content/products-evaluation-kits.asp and

are in stock at any of our Distributors.

The EnerChip CC can be configured to operate as an efficient, low cost energy harvesting circuit that includes

solid state energy storage as the energy reservoir to power the system components when ambient power is not

available for harvesting.

For assistance in designing your system to effectively harvest energy from a power transducer in a specific

environment, contact Cymbet Applications Engineering.

Cymbet, the Cymbet Logo and EnerChip are trademarks of Cymbet Corporation. All Rights Reserved

Disclaimer of Warranties; As Is

The information provided in this application note is provided “As Is” and Cymbet Corporation disclaims all representations or warranties of

any kind, express or implied, relating to this application note 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.

EnerChip Part Number

Description

Notes

CBC-EVAL-05

EnerChip CC Evaluation Kit

A CBC3112 and a CBC3150 on 24-

pin module for experimentation

CBC3150-D9C

EnerChip CC 50uAh with

Integrated Power Management

Parts sold tube or tape-and-reel

CBC-EVAL-10

EnerChip CC EH Evaluation Kit

EnerChip CC board with PV panel

and CBC51100 EnerChip module

Ordering Information