Product Discontinued - Not for New Designs
CBC-EVAL-10
EnerChip™ CC Energy Harvester Evaluation Kit
CBC-EVAL-10 is a demonstration kit that provides
designers a platform to easily develop Energy
Harvesting (EH) solutions using the EnerChip
CBC3150
TM
configured to operate in an energy
harvesting mode. The kit combines a small solar
panel, power management circuit, energy storage,
regulated output voltage, and input/output pins for
connection to commercially available microcontroller
(MCU) and radio boards. A 16-pin CBC51100 module
is included, providing the EH functions, battery
management, and 100µAh solid state rechargeable
energy storage. CBC-EVAL-10 is a practical, low
cost realization of an EH-based power system that
can provide many years of service without need of
battery maintenance.
CBC-EVAL-10 has the following elements:
•
Energy harvesting circuitry that matches the
impedance of photovoltaic cells to ensure
maximum power transfer to system load and on-
board energy storage devices
Solid state energy storage with thousands of
charge-discharge cycles available
Integrated battery management that controls
battery charging and discharge cutoff, ensuring
maximum service life of on-board storage cells
Provision for additional energy storage (primary
or rechargeable batteries) with switchover
control circuit to meet application requirements
Regulated output voltage with user-configurable
voltage settings
Input/output headers for connection to system
components such as radios and microcontrollers
System Features and Overview
•
•
Controls charge voltage and discharge cutoff
circuit for maximizing the service life of the
EnerChip solid state batteries within the CBC3150
and auxiliary CBC050 energy storage device on
the CBC51100 module.
Manages internal circuitry for switching from PV
power to EnerChip (or external battery) power when
ambient light level is too low to power the system
and/or recharge the energy storage devices.
CBC-EVAL-10 is shown in Figure 1, including the 16-
pin CBC51100 EnerChip EH module and the PV cells
attached to the board via a 2-wire cable assembly.
•
•
Figure 1: CBC-EVAL-10 Demo Kit.
A block diagram of CBC-EVAL-10 is shown in Figure 2.
Photovoltaic
Cells
•
•
•
CBC51100 Module
Input Power Tracking
Battery Management
Power Management
Energy Storage
The photovoltaic (PV) panel included in the CBC-
EVAL-10 converts ambient light energy into electrical
energy, which is fed into the CBC3150 device
residing on the CBC51100 module. The CBC3150
performs several important functions:
•
Decouples the load impedance from the PV cell
impedance to ensure maximum power conversion
efficiency from the PV transducer to the energy
storage and system load.
External Battery
and Control
(Optional)
Output Voltage
Regulation
I/O Control
Figure 2: EnerChip CBC-EVAL-10 Demo Kit block diagram.
The functions in the center block are performed by the
EnerChip CBC51100 module.
DS-72-20 Rev B
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Page 1 of 15
CBC-EVAL-10 EnerChip CC EH Evaluation Kit
Operating Modes
CBC-EVAL-10 can be configured to operate in any of three modes, as required by the application. The operating
mode is set by configuring the various jumpers on the CBC-EVAL-10. [See Figure 3 and the associated tables for
jumper settings associated with each of the operating modes.] The three operating modes are as follows:
1. Standard energy harvesting mode using PV cells, on-board EnerChips, regulated output voltage, and
switchover control circuit to ensure a seamless transition from PV power to EnerChips when little or no
ambient light is available. In this mode, power from the PV cells is used to power the system load and
charge the EnerChips when sufficient light is available. With very low or no ambient light, the system
operates from on-board EnerChips. Variations of this mode are configured using jumper select pins J11,
allowing the user to drive the internal charge pump of the CBC3150 through one of three control methods,
as indicated on the silk screen next to J11:
a) EH: External control using the BATOFF control line. Used when an external microcontroller derives
input from CHARGE/ in an ‘energy-aware’ operating mode.
b) CCEH: CBC3150 RESET/ output is fed to CBC3150 ENABLE input in a standard transducer
impedance matching mode.
c) CPEH: VIN controls the CBC3150 ENABLE line. When the input transducer voltage falls below 2.5V,
the CBC3150 charge pump is disabled.
2. Energy harvesting mode that relies on not only the on-board EnerChips for energy storage, but also taps
into the capacity of a conventional non-rechargeble battery when the EnerChips are at low state-of-charge,
such as during extended periods of darkness. Typical batteries might be 2-series alkaline cells, primary
coin cells, or certain cylindrical cells having output voltage of 3V to 3.6V. This ‘battery assist’ energy
harvesting mode can be used to supplement conventional batteries, extending their operational life by
months or years.
3. Energy harvesting mode that uses not only the PV cells and on-board EnerChips, but also an external
rechargeable battery such as a rechargeable coin cell or other small, Li-ion or Li-polymer cells having a
charging voltage of ~4.1V. This ‘extra capacity’ operating mode allows the designer to incorporate a higher
capacity rechargeable battery in order to achieve longer system run-time in periods of darkness than what
the EnerChips can provide, while avoiding the relative bulk associated with non-rechargeable cells.
In all operating modes, the input power source - whether PV cells, EnerChips, or external battery - passes
through a linear drop-out regulator (LDO) that supplies power to VOUT. The LDO output voltage is set at 2.5V
but can be modified to 3.0V - through selection of J12 and J13 solder traces - or to 2.2V or 3.3V by replacing
regulator U4 with regulator U6 (not populated) as indicated in the schematic of Figure 4 and Table 1: CBC-
EVAL-10 Bill of Materials. A power-on-reset (POR) circuit drives the LDO ENABLE pin in all operating modes
except when an external non-rechargeable battery is providing power to the LDO. To avoid starving the external
system elements of power particularly during start-up or when pulse currents are required by the system, the
POR circuit enables the LDO only after the output capacitors are fully charged to a voltage above the LDO
drop-out voltage. Consequently, the user must recognize the relationship between the POR trip voltage and the
LDO turn-on voltage when designing with a POR/LDO combination other than the components installed on the
CBC-EVAL-10 module.
DS-72-20 Rev B
©2011-2014 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
Page 2 of 15
CBC-EVAL-10 EnerChip CC EH Evaluation Kit
External Control of the CBC-EVAL-10 Energy Harvesting Functions
In addition to protecting the EnerChips from being discharged too deeply in low ambient light conditions or
abnormally high current load conditions, the CBC3150 power management circuit also ensures that the
system load is powered with a smooth power-on transition. The power management circuit has a control line
(CHARGE/) for indication to the system controller that the energy harvester is charging the EnerChips. A control
line input (BATOFF) is available for the external controller to disable the CBC3150 charge pump. Use of these
two control lines is optional.
There are several connectors on CBC-EVAL-10 for connection to target devices to be powered. Either the J9 or
J10 connector can be used for low power microcontroller-based systems. In the case of a low power wireless
end device, the CBC-EVAL-10 has storage energy for approximately 1000 radio transmissions - depending on
protocol used - in no/low ambient light conditions.
Microcontroller-based systems that are powered by the CBC-EVAL-10 should contain firmware that is “Energy
Harvesting Aware” and take advantage of the power management status and control signals available on CBC-
EVAL-10.
The CBC-EVAL-10 is designed to permit attachment of rechargeable and non-rechargeable batteries whereby
the energy harvesting circuitry extends the life of those batteries by operating from
(i)
PV cell power when suf-
ficient light is available,
(ii)
EnerChips when in an acceptable state-of-charge, and
(iii)
the external battery when
neither of those two conditions exists.
Two classes of external batteries may be attached to the CBC-EVAL-10:
1. A primary battery (i.e., non-rechargeable) or series combination of primary batteries may be connected to
header pins J3 only. The acceptable voltage range is 2.7 to 3.6. Commonly used batteries in this category
are: A single 3V CR-type or BR-type coin cell (e.g., CR2032, BR2032), or two alkaline cells (e.g., AAA, AA, C,
D) connected in series. A single 3.6V thionyl chloride cell may also be used. Contact Cymbet for recommen-
dations in selecting a primary battery for your application.
2.
A secondary (i.e., rechargeable) battery may be connected to header pins J7 only. The acceptable charging
voltage range is 4.0V to 4.2V. The charging source for this battery is the VCHG output pin of the CBC3150
that normally charges the EnerChips to 4.1V. Maximum drive current of this pin is on the order of 1mA.
VCHG drive current can be adjusted by populating capacitor C9 (module shipped without a capacitor).
See
DS-72-03 EnerChip CC CBC3150 Data Sheet
for guidelines on sizing the charge pump capacitor. The
discharge cutoff voltage is fixed at 3.0V +/- 0.3V. Examples of rechargeable batteries supported by CBC-
EVAL-10 are the LiR-type coin cells, including LiR-1220 (~8mAh) and LiR-2032 (~40mAh). The charging
rate for these external cells will be a function of available light, to a maximum of 1mA as limited by the
CBC3150 charge pump drive current.
To operate the CBC-EVAL-10 board for use with an external battery, configure the header pins as follows:
1.
Non-rechargeable (i.e., primary) battery connected to EXT BAT terminal block J3:
J1 and J2 - shorted
J4, J5, J6 - not shorted
J7 - no connection
2.
Rechargeable (i.e., secondary) battery connected to header pins J7:
J1, J2 - not shorted
J3 - no connection
J4, J5, and J6 - shorted
Using Additional EnerChips and External Batteries
DS-72-20 Rev B
©2011-2014 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
Page 3 of 15
CBC-EVAL-10 EnerChip CC EH Evaluation Kit
CBC-EVAL-10 Module Connectors, Jumpers, and Test Points
TP1
J3
TP2
CONNECTORS
Connector
Pin
Number
1
Designation
External Primary
Battery Input (+)
External Primary
Battery Input (-)
J14
J2
J6
J3
J1
J4
J5
J7
TP3
J8
CBC51100
J11
TP4
2
Connector Type: Terminal Block
External
Rechargeable
Battery Input (+)
External
Rechargeable
Battery Input (-)
1
1
J7
2
J10
1
J9
J15
J8
TP5
J12 J13
Connector Type: vias
1
2
PV Cell Input (+)
PV Cell Input (-)
Connector Type: Terminal Block
1
2
J9
3
4
5
CHARGE/
BATOFF
No Connection
GND
VOUT
Figure 3: Locations of connectors, jumpers, and test points.
JUMPERS
Jumper
J1
J2
J4
J5
J6
J11
Pin
Number
1-2
1-2
1-2
1-2
1-2
1-2
3-4
5-6
Designation
External Battery to LDO Enable
External Battery Mode Enable
External Battery Bypass
VOUT to LDO Enable
Voltage Threshold Detect to LDO Enable
External Control of Energy Harvesting
Normal Energy Harvesting Mode
Disable Energy Harvesting
J10
Connector Type: Vertical SIP
1
2
3
4
5
6
BATOFF
GND
No Connection
No Connection
VOUT
CHARGE/
Connector Type: Right Angle SIP
TEST POINTS
Test Point
Designation
External Primary Battery (+)
GND
DC Input (PV+)
VOUT
GND
TP1
TP2
TP3
TP4
TP5
PCB TRACES and PADS
Reference
J12
J13
J15
Designation
LDO Voltage Select
LDO Voltage Select
Schottky Diode Bypass
DS-72-20 Rev B
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Page 4 of 15
CBC-EVAL-10 EnerChip CC EH Evaluation Kit
CBC-EVAL-10 Module Connector Descriptions
J3:
Terminal block for connecting the positive and negative terminals of an external non-rechargeable battery.
See specifications elsewhere in this document for the minimum and maximum allowable battery voltage before
attaching a battery to this connector.
external 4.1V rechargeable battery. No other connections are allowed on these pins and the pins are not to
be shorted together. See specifications elsewhere in this document for the minimum and maximum allowable
external battery voltage before attaching a battery to this connector.
J7:
Header pins to be used only for the purpose of connecting the positive and negative terminals of an
J8:
Terminal block for connecting a photovoltaic cell (or other DC voltage). See specifications elsewhere in this
document for the minimum and maximum allowable DC voltage to be applied to this connector.
J9 and J10:
Power and handshaking signals for connection to a target board - e.g. wireless end-point module.
(For reference, header connector J9 is a 5-pin section of Samtec 50-pin header p/n TSW-150-07-G-S. Header
connector J10 is Mill-Max p/n 850-10-006-20-001000; the socket it mates to is Mill-Max p/n 851-93-006-20-
001000.)
J14:
Used for factory test purposes only. Do not make any connections to J14.
Cable Assembly
- A 5-conductor cable with a header connector at each end is provided with CBC-EVAL-10 to
facilitate connection between the J9 connector and a 5-pin header on the user’s board.
Getting Started
To operate the CBC-EVAL-10 in the standard energy harvesting mode, using the EnerChips as the storage
devices, leave each of the several jumpers in the same position as received. The factory default settings are as
follows:
Header
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J12
J13
J14
J15
Shorting Jumper, Connector, or Solder Trace/Pad
No
No
No
Yes
Yes
Yes
No.
DO NOT APPLY A SHORTING JUMPER TO J7 UNDER ANY CIRCUMSTANCES! Doing
so will destroy the EnerChips.
PV Cell Input (2.5VDC to 5.5VDC)
System I/O (See J9 and J10 Pin Descriptions Table)
System I/O (See J9 and J10 Pin Descriptions Table)
Pin 3 to Pin 4
Leave as is for 2.5V Regulated Output (Cut J12 and Short J13 for 3.0V Regulation)
Leave as is for 2.5V Regulated Output (Cut J12 and Short J13 for 3.0V Regulation)
No Connections Necessary (Used for Factory Testing)
Leave as is for 2.5V Regulated Output
DS-72-20 Rev B
©2011-2014 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
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