CBC-EVAL-11
EnerChip™ CC Inductive Charging Evaluation Kit
Overview
CBC-EVAL-11 is a demonstration kit combining an
inductive transmitter board with a receiver board
containing an EnerChip CC CBC3150 solid state
storage device with integrated power management.
The transmitter board operates at 13.56 MHz and
derives its power from a USB port. In addition to
the EnerChip CC, the receiver board has a planar
antenna for receiving power from the transmitter
board, an output capacitor for delivering pulse
current for radio transmissions, and a header
connector for mating to a target board containing,
for example, a microcontroller and/or radio board. A
block diagram of CBC-EVAL-11 is shown in Figure 1.
Figure 2: CBC-EVAL-11 Evaluation Kit.
PCB colors may be green or red.
Features
•
•
•
•
•
•
•
•
•
•
•
Inductively-Coupled Charging Circuit
Power Manager with Charge Control
Microcontroller/Radio Interface Signals
Integrated 50µAh Solid State Energy Storage
Built-in Protection of Energy Storage Device
Temperature Compensated Charge Control
Adjustable Switchover Voltage
Low Self-Discharge
SMT - Lead-Free Reflow Tolerant
Thousands of Recharge Cycles
Eco-Friendly, RoHS Compliant
Applications
Figure 1: Block Diagram of CBC-EVAL-11 Evaluation Kit -
transmitter board (top) and receiver board (bottom).
DS-72-14 Rev C
• Rechargeable power source
eliminates cost of
replacing conventional batteries.
• Wireless sensors, data loggers, and RFID tags
and other powered, low duty cycle applications.
Contactless recharging.
• Localized power source
to keep microcontrollers
and other devices alert in standby mode.
• Medical devices
such as ‘smart’ bandages,
external biological sensors, and patient
monitoring. No direct connection needed to/
from power supply; can be hermetically sealed.
• Industrial systems
such as data logging in cold-
chain time and temperature monitoring.
• Inductive Coupling
allows convenient means of
recharging integrated EnerChip for thousands of
uses in RFID, sensor, and wireless transmitter
applications.
©2012 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
Page 1 of 8
EnerChip™ CC Inductive Charging Evaluation Kit
System Description
CBC-EVAL-11 (Figure 3) is an inductive RF charger for the CBC3150 with integrated energy storage
management and energy harvesting emulation. The CBC-EVAL-11 system consists of an inductive wireless
transmitter module tuned to a frequency of 13.56MHz and an inductive wireless charger (receiver) module.
The transmitter module is designed to be powered by a computer USB port as shown in Figure 4.
The wireless inductive charger module consists of a planar inductor fabricated on the printed circuit board
in parallel with a variable capacitor. This circuit forms a resonant tank circuit tuned to a frequency of 13.56
MHz, which in turn feeds the AC input of a full-wave bridge rectifier. The DC output of the rectifier is filtered
by a capacitor and clamped by a Zener diode. The DC output is then regulated by a linear regulator to 3.3V
and fed to the input of the Cymbet CBC3150. The CBC3150 has a power management circuit and a 50µAh
thin film EnerChip rechargeable cell. When the CBC-EVAL-11 receiver antenna is placed near a magnetic field
at a frequency of 13.56MHz, and if the voltage at the CBC3150 VDD pin is greater than 3.0V, the CBC3150
will route the harvested power directly to the energy harvesting connectors. In this mode of operation the
CBC3150’s RESET/ line will be high, the LED will be illuminated, and the CHARGE/ indicator on the energy
harvesting connectors will be low. In this mode, the integrated EnerChip solid state energy storage device will
charge from a completely depleted state to 80% of full charge within 30 minutes. When the CBC-EVAL-11 unit is
removed from the magnetic field and the input voltage to the CBC3150 drops below 3.0V, the RESET/ line will
go low, the LED will be off, and EnerChip power will be routed to the energy harvesting connector. The CHARGE/
indicator on the energy harvesting connectors will be forced high. For additional energy storage capacity, up to
9 additional CBC050 EnerChip storage devices may be connected to the VBAT pin of the CBC3150.
A second handshake line on the energy harvesting connector - BATOFF - is an input that can be used by the
application controller to disable the CBC3150 energy storage charging circuitry. When the BATOFF line is
driven high, the ENABLE input on the CBC3150 will be driven low, disabling the energy storage device charger
circuits. This feature promotes a long service life of the EnerChip by removing the charging voltage from the
EnerChip terminals when the EnerChip is fully charged. Due to the low self-discharge of the EnerChip, it is not
necessary to constantly charge the cell when not in use. With the functions and connector pins available on the
CBC-EVAL-11, an external load such as a radio and microcontroller (MCU) can be powered when in inductive
charging mode, or directly from the CBC3150 EnerChip CC device on the CBC-EVAL-11 receiver board. For
example, the radio/MCU board illustrated in Figure 3 is a wireless end device available from Texas Instruments,
as part of the eZ430-RF2500-SEH MSP430 Solar Energy Harvesting Development Tool. Other low power
radios and MCUs can also be connected to either the 6-pin right-angle connector, or the 5-pin straight header
connector on the CBC-EVAL-11 receiver board.
Note: The shorting jumper provided with the wireless charger (receiver) board should be placed across pins
1 and 2 of the 3-pin header. This connects the CBC3150 charge pump output (VCHG) to the positive terminal
of the EnerChip (VBAT) to allow the EnerChip to charge when input power is available to the CBC3150. Do not
place the shorting jumper across pins 2 and 3 of the 3-pin header. Pin 1 is indicated by the square solder pad
on the bottom of the receiver board. Also, the J5 silkscreen label on the top of the board is adjacent to pin 1.
The output of the CBC3150 is filtered by a 1000µF capacitor. This value of capacitor is only needed for
applications that require high pulse currents such as a ZigBee radio. A short tutorial on specifying output
capacitance for a given pulse current is given at the end of this section. A full Application Note on this topic -
AN-1025: Using the EnerChip in Pulse Current Applications - is available from Cymbet.
The wireless inductive transmitter (Figure 5) consists of a DC-DC converter to boost the 5VDC input to 9V. A
crystal oscillator is used to generate a 13.56MHz clock, which in turn is used to drive several buffers and a
transistor driver that drives a planar inductor and series capacitor, forming a series resonate tank circuit tuned
to a frequency of 13.56MHz.
Specifications for the EnerChip embedded in the EnerChip CC CBC3150 are given in the table below. Full
specifications for the EnerChip CC CBC3150 are available at www.cymbet.com.
DS-72-14 Rev C
©2012 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
Page 2 of 8
EnerChip™ CC Inductive Charging Evaluation Kit
Receiver Board
USB Power Cable
and Connector
J5
Transmitter Board
Texas Intruments
eZ430-RF2500
(not included)
Figure 3: CBC-EVAL-11 Evaluation Kit.
Important Note: For proper receiver board operation the jumper on connector J5 adjacent
to the CBC3150 must be placed on pins 1 and 2. Pin 1 is on the right side of this connector
viewed from above (not the left side). Some receiver boards may have the jumper shipped on
pins 2 and 3 and the jumper must be moved. The photo above shows correct placement.
NC
NC
Figure 4: Schematic of CBC-EVAL-11 transmitter board.
DS-72-14 Rev C
©2012 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
Page 3 of 8
EnerChip™ CC Inductive Charging Evaluation Kit
Figure 5: CBC-EVAL-11 circuit boards: transmitter (left [bottom view]) and receiver (right [top view]). The planar inductor on
the receiver board may be physically and electrically isolated from the remaining circuitry and substituted with a differ-
ent inductor for the purpose of evaluating other inductively coupled product concepts. See the section titled Circuit Board
Alterations for proper techniques to separate the planar antenna from the receiver board.
Figure 6: Schematic of CBC-EVAL-11 receiver board.
DS-72-14 Rev C
©2012 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
Page 4 of 8
EnerChip™ CC Inductive Charging Evaluation Kit
Absolute Maximum Ratings
Parameter
V
DD
with respect to GND
ENABLE and V
MODE
Input Voltage
V
BAT
(1)
V
CHG
(1)
V
OUT
RESET Output Voltage
CP, Flying Capacitor Voltage
CN
(1)
Condition
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
Min
GND - 0.3
GND - 0.3
3.0
3.0
GND-0.3
GND - 0.3
GND - 0.3
GND - 0.3
Typical
-
-
-
-
-
-
-
-
Max
6.0
V
DD
+0.3
4.3
4.3
6.0
V
OUT
+0.3
6.0
V
DD
+0.3
Units
V
V
V
V
V
V
V
V
No external connections to these pins are allowed, except parallel EnerChips.
Operating Characteristics
Parameter
Output Voltage V
OUT
Output Voltage V
OUT (Backup Mode)
EnerChip Pulse Discharge Current
Self-Discharge (5 yr average, 25°C)
Operating Temperature
Storage Temperature
Cell Resistance
Recharge Cycles
(to 80% of rated ca-
pacity; 4.1 V charge
voltage)
25°C
40°C
Condition
V
DD
>
V
TH
V
DD
<
V
TH
-
Min
-
Typical
V
DD
3.3
2.5
1.5
(1)
25
-
Max
-
Units
V
V
-
% per year
% per year
°C
°C
Ω
-
-
-
-
minutes
µAh
2.2
-
-
3.6
-
-
variable - see App. Note 1025
non-recoverable
recoverable
-
-
-20
-40
-
+70
+125
(2)
2500
-
-
-
-
25°C
10% depth-of-discharge
50% depth-of discharge
10% depth-of-discharge
50% depth-of-discharge
4.1 V constant volta
ge
100 µA discharge; 25°C
1500
-
-
-
-
5000
1000
2500
500
-
50
Recharge Time (to 80% of rated capacity)
Capacity
(1)
(2)
30
-
-
-
First month recoverable self discharge is 5% average.
Storage temperature is for uncharged EnerChip CC device.
Note: All specifications contained within this document are subject to change without notice
Typical Discharge Capacity Characteristics
Typical Discharge Rate Performance
DS-72-14 Rev C
©2012 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
Page 5 of 8
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