Manual

DEMO MANUAL DC2080A
Energy Harvesting (EH)
Multi-Source Demo Board
with Transducers
Description
The DC2080 is a versatile energy harvesting demo board
that is capable of accepting piezoelectric, solar, 4mA to
20mA loops, thermal powered energy sources or any high
impedance AC or DC source. The board contains four
independent circuits consisting of the following EH ICs:
• LTC®3588-1: Piezoelectric Energy Harvesting Power
Supply
• LTC3108: Ultralow Voltage Step-Up Converter and
Power Manager
• LTC3105: Step-Up DC/DC Converter with Power Point
Control and LDO Regulator
• LTC3459: 10V Micropower Synchronous Boost Converter
• LTC2935-2 and LTC2935-4: Ultralow Power Supervisor
with Power-Fail Output Selectable Thresholds
The board is designed to connect to the Energy Micro STK
development kit. It also includes two energy harvester
transducers (TEG and Solar) and a terminal block for
connecting a high impedance AC source.
In addition, many turrets are provided, making it easy to
connect additional transducers to the board.
The board contains multiple jumpers that allow the board
to be configured in various ways. The standard build for
the board has 4 jumpers installed out of the possible 12
jumpers. The board is very customizable to the end users’
needs. This compatibility makes it a perfect evaluation tool
for any low power energy harvesting system.
Please refer to the individual data sheets for the operation of each power management circuit. The application
section of this demo manual describes the system level
functionality of this board and the various ways it can be
used in early design prototyping.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2080A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Board Photo
Figure 1. DC2080A Connected to an Energy Micro Starter Kit in the “To Go” Design Kit for Energy Harvesting
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DEMO MANUAL DC2080A
Quick Start Procedure
Refer to Figures 2, 3 and 4 for the proper equipment setup
and jumper settings for the following quick start procedure.
9. MOVE JP4 to JP1. Disconnect the Energy Micro starter
kit from J1.
1. Configure the equipment and jumpers as shown in
Figure 2. Verify the jumper settings are as follows:
10.Set PS2 equal to 6.0V. Reconfigure the test equipment
as shown in Figure 3.
JP1
OPEN
JP2
OPEN
JP3
OPEN
11.Turn on PS2. Observe the voltage on VM1 and VM2.
The voltage on VM1 should be approximately 5.77
Volts and on VM2 should be 3.3V.
JP4
OPEN
12.Use VM3 to observe the voltage on JP5-2. The voltage
should be equal to the same level observed on VM2.
JP5
OPEN
13.Turn off PS2
JP6
OPEN
JP7
OPEN
JP8
OPEN
14.MOVE JP1 to JP3. Disconnect PS2 from the board and
set PS3 equal to 5.0V. Reconfigure the test equipment
as shown in Figure 4.
JP9
INSTALLED in “ON” Position
JP10 OPEN
JP11 OPEN
JP12 INSTALLED
2. Slowly increase PS1 and observe the voltage at which
VM2 turns on. VM1 should be equal to approximately
3.15V.
3. Slowly decrease PS1 towards zero. Observe the voltage on VM1 at which VM2 drops rapidly to 0V. VM1
should be equal to approximately 2.25V.
4. Turn off PS1 and remove all test equipment.
5. Install JP4 and connect the Energy Micro starter kit
board to J1.
6. Apply a light source and observe the starter kit turning
on and displaying the temperature of the microcontroller.
7. MOVE JP4 to JP2 and place a warm object, such as
your hand, firmly on the entire TEG1, thermal electric
generator.
8. Observe the starter kit turning on and displaying the
temperature of the microcontroller.
15.Turn on PS3. Observe the voltage on VM1 and VM2.
The voltage on VM1 should be approximately 0.34
Volts and on VM2 should be 3.3V.
16.Use VM3 to observe the voltage on JP7-2. The voltage
should be approximately equal to the level observed
on VM2.
17.Turn off PS3
18.Reset the Jumpers as shown in Figure 5a.
JP1
OPEN
JP2
OPEN
JP3
OPEN
JP4
INSTALLED
JP5
OPEN
JP6
OPEN
JP7
OPEN
JP8
OPEN
JP9
INSTALLED in “ON” Position
JP10 OPEN
JP11 INSTALLED
JP12 OPEN
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DEMO MANUAL DC2080A
Quick Start Procedure
Figure 2. VMCU Power Switchover Test Setup
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DEMO MANUAL DC2080A
Quick Start Procedure
Figure 3. Piezoelectric Circuitry Test Setup. Proper Measurement
Equipment Setup for DC2080A Piezoelectric Circuit Testing
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DEMO MANUAL DC2080A
Quick Start Procedure
Figure 4. 4mA to 20mA Loop Circuitry Test Setup. Proper Measurement
Equipment Setup for DC2080A 4mA to 20mA Loop Circuit Testing
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DEMO MANUAL DC2080A
Quick Start Procedure
Figure 5a. DC2080A Top Assembly Drawing
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DEMO MANUAL DC2080A
Quick Start Procedure
Figure 5b. DC2080A Bottom Assembly Drawing
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DEMO MANUAL DC2080A
Application
Jumper Functions
JP1: Power selection jumper used to select the LTC3588-1,
Piezoelectric Energy Harvesting Power Supply.
JP2: Power selection jumper used to select the LTC3108,
TEG Powered Energy Harvester.
JP3: Power selection jumper used to select the LTC3105,
powered by a diode voltage drop in a 4mA to 20mA loop.
JP4: Power selection jumper used to select the LTC3459,
powered by a solar panel.
JP5: Routes the LTC3588-1 PGOOD signal to the Dust
header PGOOD output. The LTC3588-1 PGOOD comparator
produces a logic high referenced to VOUT on the PGOOD
pin the first time the converter reaches the sleep threshold
of the programmed VOUT, signaling that the output is in
regulation. The PGOOD pin will remain high until VOUT
falls to 92% of the desired regulation voltage. Additionally, if PGOOD is high and VIN falls below the UVLO falling
threshold, PGOOD will remain high until VOUT falls to 92%
of the desired regulation point. This allows output energy
to be used even if the input is lost.
JP6: Routes the LTC3108 PGOOD signal to the header
PGOOD output.
JP7: Routes the LTC3105 PGOOD signal to the header
PGOOD output.
JP8: Routes the LTC3459 PGOOD signal to the header
PGOOD output.
JP9: Connects the fifteen optional energy storage capacitors directly to VOUT to be used by the load to store energy
at the output voltage level. The 100μF capacitors have a
voltage coefficient of 0.61 of their labeled value at 3.3V
and 0.47V at 5.25V. CAUTION: Only JP9 OR JP10 may
be connected at any one time. Do not populate both
JP9 and JP10.
JP10: Connects the fifteen optional energy storage capacitors directly to VSTORE of the LTC3108 TEG powered
energy harvester circuit, which is the output for the storage
capacitor or battery. A large capacitor may be connected
from VSTORE to GND for powering the system in the
event the input voltage is lost. It will be charged up to the
maximum VAUX clamp voltage, typically 5.25 Volts. The
100µF capacitors have a voltage coefficient of 0.47V at
5.25V. CAUTION: Only JP9 OR JP10 may be connected
at any one time. Do not populate both JP9 and JP10.
JP11: Configures the AC input for use with a PMDM
vibration harvester, CAUTION: Only JP11 OR JP12 may
be connected at any one time. Do not populate both
JP11 and JP12.
JP12: Configures the AC input for use with any high
impedance source including piezoelectric transducers,
electromechanical transducers or AC mains supplies with
high series resistance. CAUTION: Only JP11 OR JP12
may be connected at any one time. Do not populate
both JP11 and JP12.
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DEMO MANUAL DC2080A
Application
Turret Functions
PZ1 (E1): Input connection for piezoelectric element or
other AC source (used in conjunction with PZ2). A high
impedance DC source may be applied between this pin
and BGND to power the LTC3588-1 circuit. CAUTION: The
maximum current into this pin is 50mA.
PZ2 (E2): Input connection for piezoelectric element or
other AC source (used in conjunction with PZ1). A high
impedance DC source may be applied between this pin
and BGND to power the LTC3588-1 circuit. CAUTION: The
maximum current into this pin is 50mA.
VIN, 20mV to 400mV (E3): Input to the LTC3108, TEG
powered Energy Harvester. The input impedance of the
LTC3108 power circuit is approximately 3Ω, so the source
impedance of the TEG should be less than 10Ω to have
good power transfer. TEG’s with approximately 3Ω will
have the best power transfer. The input voltage range is
20mV to 400mV.
BGND (E4,E6,E8,E11,E14): This is the board ground.
BGND is connected to all the circuits on the board except the headers. BGND and HGND, the header ground
are connected through Q3 when the VMCU voltage with
respect to BGND reaches the rising RESET Threshold of
U2 and disconnected when VMCU falls to the falling reset
threshold. The board is configured from the factory to
connect BGND and HGND when VMCU equals 3.15V and
disconnect them when VMCU equals 2.25V.
+VIN, 4mA to 20mA LOOP (E5): Input to the LTC3105
supplied by a diode voltage drop. The current into this
terminal must be limited to between 4mA and 20mA. The
current into this turret flows through diode D1 to generate the diode voltage drop and into the LTC3105 power
management circuit.
VIN SOLAR (E7): Input to the LTC3459, solar powered
circuit with maximum power point control, provided by
the LTC2935-4. The input regulation point for the MPPC
function is 1.73V. The input range is 1.72V to 3.3V.
HGND (E9,E13): This is the header ground. HGND is the
switched ground to the header that ensures the load is
presented with a quickly rising voltage. BGND and HGND
are connected through Q3 when the VMCU voltage with
respect to BGND reaches the rising RESET Threshold of
U2 and disconnected when VMCU falls to the falling reset
threshold. The board is configured from the factory to
connect BGND and HGND when VMCU equals 3.15V and
disconnect them when VMCU equals 2.25 Volts.
VMCU (E10,E12): Regulated output of all the active energy
harvester power management circuits, referenced to BGND.
When VMCU is referenced to HGND it is a switched output
that is passed through header, J1 to power the load.
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DEMO MANUAL DC2080A
Application
LTC3588-1: Piezoelectric Energy Harvesting Power
Supply (Vibration or High-Impedance AC Source)
The PGOOD_LTC3459 signal is always used to switch the
output voltage on the header. Some loads do not like to
see a slowly rising input voltage. Switch Q3 ensures that
VMCU on the header is off until the energy harvested output
voltage is high enough to power the load. The LTC2935-2
is configured to turn on Q3 at 3.15V and turn off Q3 at
2.25V. With this circuit, the load will see a fast voltage rise
at startup and be able to utilize all the energy stored in the
output capacitors between the 3.15V and 2.25V levels.
The LTC3588-1 piezoelectric energy harvesting power
supply is selected by installing the power selection jumper
JP1. The PGOOD signal can be routed to the header by
installing jumper JP5.
If the application requires a wide hysteresis window for
the PGOOD signal, the board has the provision to use
the independent PGOOD signal, shown in Figure 10,
generated by the LTC2935-2 and available on JP8. This
signal is labeled as the PGOOD signal for the LTC3459
circuit (PGOOD_LTC3459), because the LTC3459 does
not have its own PGOOD output. The PGOOD_LTC3459
signal can be used in place of any of the PGOOD signals
generated by the harvester circuits. The board is configured
from the factory to use the PGOOD_LTC3459 signal as
the PGOOD signal to switch from battery power to energy
harvesting power.
E12
PZ2
E1
*
The optional components R1, R4, Q1 and C5 shown on
the schematic are not populated for a standard assembly.
The function of R1, R4, Q1 and C5 is to generate a short
PGOOD pulse that will indicate when the output capacitor
is charged to its maximum value. The short pulse occurs
every time the output capacitor charges up to the output
sleep threshold, which for a 3.3V output is 3.312V. By
populating these components the application can use
this short pulse as a sequence timer to step through the
E2
PZ1
J3
C29
10µF
1210
1
PZ2
2
PZ2
3
PZ1
PZ1 4
PIEZO CONNECTOR
JP11
PMDM
C3
22µF
25V
1210
JP12
PIEZO
OUTPUT VOLTAGE SETTINGS
VOUT
1.8V
2.5V
3.3V
3.6V
D1
0
0
1
1
D0
0
1
0
1
VIN*
R2
NOPOP
R3
0Ω
R8
0Ω
R9
NOPOP
4
C1
1µF
6.3V 3
7
C4
4.7µF
6.3V 11
PZ1
VIN
PZ1
SW
5
L1
22µH
WÜRTH, 744043220
LTC3588-1
CAP
VIN2
VOUT
GND
PGOOD
D1
DO
C5
0.1µF
16V
OPT
VMCU
E10
JP1
VOUT = 3.3V VOUT_LTC3588-1
R1
4.99k
OPT
6
10
LTC3588-1 PIEZOELECTRIC
ENERGY HARVESTER
(HIGH-IMPEDANCE AC SOURCES)
C1
100µF
6.3V
1210
20%
D2
1N5819HW
SOD-123
OPT
VMCU
E11
BGND
R4
50.5k
OPT
Q1
ZXMN2F30FH
OPT
PGOOD_LTC3588-1
IIN
≤ 18VPK ≤50mA
> 18VPK
≤5mA
DC2080A F06
Figure 6. Detailed Schematic of LTC3588-1 Piezoelectric Energy Harvesting Power Supply
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DEMO MANUAL DC2080A
Application
program sequence or as an indication of when it can
perform energy-intensive functions, such as a sensor
read or a wireless transmission and/or receive, knowing
precisely how much charge is available in the output
capacitors. When this optional circuit is not used, the
amount of charge in the output capacitors is anywhere
between the maximum (COUT • VOUT_SLEEP) to eight percent low. In the case where the energy harvesting source
can support the average load continuously, this optional
circuit is not needed.
setpoint to compensate for the diode drop. When more
than one of these diodes is installed and the associated
energy harvester inputs are powered, the board will switch
between energy harvester power circuits as needed to
maintain the output voltage.
LTC3108: TEG Powered Energy Harvester
The LTC3108 TEG powered energy harvester is selected
by installing the power selection jumper JP2. The PGOOD
signal, PGOOD_LTC3108 can be routed to the header by
installing Jumper JP6. The LTC3108 PGOOD signal is
pulled up to the on-chip 2.2V LDO through a 1MΩ pullup resistor.
Diode D2 is an optional component used to diode-OR
multiple energy harvesting sources together. This diode
would be used in conjunction with one or more of the
other Or-ing diodes, D3, D4 or D5. When the Or-ing diodes
are installed the parallel jumper would not be populated.
The diode drop will be subtracted from the output voltage regulation point, so it is recommended to change
the feedback resistors or select a higher output voltage
VIN
20mV TO 400mV
E3
1
RED (+)
2
BLACK (–)
TEG1
PELTIER
MODULE
R13
499k
T1
WÜRTH 74488540070
1
3
2
4
C12
220µF
6.3V
D2E CASE
+
E4
BGND
C8
330pF
0603, 50V
VAUX
C8
330pF
0603, 50V
12
11
C9
0603
OPT 10
VAUX
R15
NOPOP
R16
0Ω
9
8
TP4
7
VOUT2_EN
VOUT2_EN
TP3
VOUT2
VOUT2
If the application requires a wide hysteresis window for
the PGOOD signal, please refer to the above section for a
complete operational description of and how to use the
independent PGOOD signal (PGOOD_LTC3459), shown
in Figure 10, generated by the LTC2935-2 and available
on JP8.
R17
0Ω
R18
NOPOP
SW
U3
VAUX
LTC3108EDE
C2
VSTORE
C1
VOUT
VOUT2_EN
VOUT2
VS1
VLDO
VS2
PGD
GND
C7
1µF
6.3V
1
TP1
2
C10
100µF
6.3V
1210
20%
3
4
5
6
VOUT2
C28
0.1µF
16V
TP3
VLDO
C14
2.2µF
6.3V
0603
VOUT = 3.3V
+
C13
220µF
6.3V
D2E CASE
PGOOD_LTC3108
VSTORE
TP2
BGND
LTC3108EDE TEG
POWERED ENERGY
HARVESTER
JP2
VOUT_LTC3108
D3
1N5819HW
SOD-123
OPT
DC2080A F07
Figure 7. Detailed Schematic of LTC3108 TEG Powered Energy Harvester
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DEMO MANUAL DC2080A
Application
The PGOOD_LTC3459 signal is always used to switch the
output voltage on the header. Some loads do not like to
see a slowly rising input voltage. Switch Q3 ensures that
VMCU on the header is off until the energy harvested
output voltage is high enough to power the load.
LTC3105: Supplied By Diode Voltage Drop In 4mA to
20mA Loop
The LTC3105 4-20mA Loop, Diode Voltage Drop powered
energy harvester is selected by installing the power selection
jumper JP3. The PGOOD signal, PGOOD_LTC3105 can
be routed to the Header by installing Jumper JP7. The
PGOOD_LTC3105 signal is an open-drain output. The
pull-down is disabled at the beginning of the first sleep
event after the output voltage has risen above 90% of its
regulation value. PGOOD_LTC3105 remains asserted until
VOUT drops below 90% of its regulation value at which
point PGOOD_LTC3105 will pull low. The pull-down is also
disabled while the IC is in shutdown or start-up mode.
When the PGOOD signal from the LTC3108 is used as
the header signal, the setpoint for the LTC2935-2 circuit
needs to be changed so the turn-on threshold is below
the PGOOD_LTC3108 turn-on threshold of 3.053V. For
example, by changing R36 to a 0Ω Jumper and R5 to
NOPOP, the turn-on threshold for Q3 will be 2.99V rising
and 2.25V falling.
Diode D3 is an optional component used to diode-OR multiple energy harvesting sources together. This diode would
be used in conjunction with one or more of the other Or-ing
diodes, D2, D4 or D5. When the Or-ing diodes are installed
the parallel jumper would not be populated. The diode
drop will be subtracted from the output voltage setpoint,
so it is recommended to change the feedback resistors
or select a higher output voltage setpoint to compensate
for the diode drop. When more than one of these diodes
is installed and the associated energy harvester inputs are
powered, the board will switch between energy harvester
power circuits as needed to maintain the output voltage.
E5
VIN+
4mA TO 20mA
LOOP
E6
BGND
If the application would benefit from a wider PGOOD
hyteresis window than the LTC3105 provides (sleep to
VOUT minus 10%), the PGOOD_LTC3459 signal can be
used in place of any of the PGOOD signals generated by
the harvester circuits.
The PGOOD_LTC3459 signal is always used to switch the
output voltage on the header. Some loads do not like to
see a slowly rising input voltage. Switch Q3 ensures that
VMCU on the header is off until the energy harvested
output voltage is high enough to power the load.
LTC3105EE
SUPPLIED BY DIODE
VOLTAGE DROP
L2
10µH
WÜRTH 744031100
+
C16
220µF
6.3V
D2E CASE
D1
1.5A/200V
AS1PD
SMP
C15
10µF
0805
6.3V
6
5
TP7
VIN
SW
MPPC
VOUT
FB
U4
LTC3105EDD
MPPC
R34
40.2k
LDO
8
PGOOD_LTC3105
4
TP7
SHDN
PGOOD
SHDN
GND
FBLDO
AUX
VOUT = 3.3V
7
9
1
R19
392k
C19
33pF
R20
750k
C17
10µF
6.3V
0805
C18
1µF
6.3V
JP3
VOUT_LTC3105
D4
1N5819HW
SOD-123
OPT
R21
499k
2
C20
33pF
3
10
C22
1µF
16V
0603
TP4
AUX
R24
1.1M
R25
549k
LDO
C21
4.7µF
16V
0805
Q2
ZXMN2F30FH
OPT
R22
2.8M
OPT
R23
200k
DC2080A F08
Figure 8. Detailed Schematic of LTC3105 4mA to 20mA Loop, Diode Voltage Drop Energy Harvester
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DEMO MANUAL DC2080A
Application
The optional components shown on the schematic are
not populated for a standard assembly. The function
of R22 and Q2 is to generate a short PGOOD pulse that
will indicate when the output capacitor is charged to its
maximum value. The short pulse occurs every time the
output capacitor charges up to the output sleep threshold,
which for a 3.3V output is 3.312V. By populating these
components the application can use this short pulse as a
sequence timer to step through the program sequence or
as an indication of when it can perform energy intensive
functions, such as a sensor read or a wireless transmission
and/or receive, knowing precisely how much charge is
available in the output capacitors. When this optional circuit
is not used, the amount of charge in the output capacitors
is anywhere between the maximum (COUT • VOUT_SLEEP) to
ten percent low. In the case where the energy harvesting
source can support the average load continuously, this
optional circuit is not needed.
Diode D4 is an optional component used to Diode-OR
multiple energy harvesting sources together. This diode
would be used in conjunction with one or more of the other
Or-ing diodes, D2, D3 or D5. When the Or-ing diodes are
installed the parallel jumper would not be populated. The
diode drop will be subtracted from the output voltage setpoint so it is recommended to change the feedback resistors
or select a higher output voltage setpoint to compensate
for the diode drop. When more than one of these diodes
is installed and the associated energy harvester inputs are
powered, the board will switch between energy harvester
power circuits as needed to maintain the output voltage.
LTC3459 Supplied By Solar Cell
The LTC3459 solar powered energy harvester is selected
by installing the power selection jumper JP4. The PGOOD
signal, PGOOD_LTC3459 can be routed to the Header by
installing Jumper JP8.
The LTC2935-4 adds a hysteretic input-voltage regulation
function to the LTC3459 application circuit. The PFO output
of the LTC2935-4 is connected to the SHDN input on the
LTC3459, which means that the LTC3459 will be off until
VIN_LTC3459 rises above 1.743V (1.72V + 2.5%) and
will then turn off when VIN_LTC3459 falls below 1.72V.
The result is that the input voltage to the LTC3459 circuit
will be regulated to, 1.73V, the average of the LTC2934-4
rising and falling PFO thresholds. The threshold can be
adjusted for the peak operating point of the solar panel
selected. In this design, because the LTC3459 output is
set to 3.3V and is a boost topology, the input voltage is
limited to 3.3V.
VIN SOLAR
1.72V TO 3.3V
E7
1
POS (+)
2
NEG (–)
D6 (SOLAR PANEL)
AM-5412
L3
22µH
WÜRTH 744028220
+
E3
BGND
C23
220µF
6.3V
D2E CASE
C24
100µF
6.3V
1210
20%
R26
0Ω
R27
0Ω
E14
BGND
R31
NOPOP
R32
NOPOP
R28
0Ω
U6
LTC2935CTS8-4
1
8
S2
VCC
2
7
MR
S1
3
6
S0 RST
4
5
GND PFO
R33
NOPOP
1
VIN
6
SW
VOUT
C27
0.1µF
16V
3
LTC3459EDC
SUPPLIED BY
SOLAR CELL
U5
LTC3459EDC
SHDN
VOUT = 3.3V
2
R29
1.96M
FB
4
GND GND
5
7
R30
1.15M
C25
47pF
C26
100µF
6.3V
1210
20%
JP4
VOUT_LTC3459
D5
1N5819HW
SOD-123
OPT
DC2080A F09
Figure 9. Detailed Schematic of LTC3459 Supplied by a Solar Cell
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DEMO MANUAL DC2080A
Application
J1
SAMTEC-SMH-110-02-L-D
VOUT_LTC3105
D4
1N5819HW
SOD-123
OPT
GND GND GND
19
12
1
JP8
PGOOD_LTC3459
E13
R5
0Ω
R6
0Ω
R7
NOPOP
LTC3459EDC
SUPPLIED BY
SOLAR CELL
JP4
VOUT_LTC3459
E9
HGND
R10
NOPOP
R11
NOPOP
R12
NOPOP
U2
LTC2935CTS8-4
1
8
S2
VCC
2
7
MR
S1
3
6
S0 RST
4
5
GND PFO
R14
NOPOP
HGND
Q3
ZXMN2F30FH
SOT23
C27
0.1µF
16V
RST
R35
NOPOP
D5
1N5819HW
SOD-123
OPT
R36
NOPOP
DC2080A F10
Figure 10. Detailed Schematic of PGOOD_LTC3459 Circuit Using LTC2935-2
The LTC3459 does not have an internally generated
PGOOD signal so the LTC2935-2 was used to generate a
PGOOD function with an adjustable hysteresis window.
The NOPOP and 0Ω resistors around the LTC2935-2 allow
for customization of the PGOOD thresholds and hysteresis
window. By using R14, R35 and R36 the inputs can be
changed after the rising Threshold is reached, creating a
large hysteresis window.
The PGOOD_LTC3459 signal can be used in place of any
of the PGOOD signals generated by the harvester circuits.
The PGOOD_LTC3459 signal is always used to switch the
output voltage on the header. The board is configured
from the factory to use the PGOOD_LTC3459 signal as
the PGOOD signal to switch from battery power to energy
harvesting power.
The PGOOD_LTC3459 signal is always used to switch the
output voltage on the header. Some loads do not like to
see a slowly rising input voltage. Switch Q3 ensures that
VMCU on the header is off until the energy harvested output
voltage is high enough to power the load. The LTC2935-2
is configured to turn on Q3 at 3.15V and turn off Q3 at
2.25V. With this circuit, the load will see a fast voltage rise
at start-up and be able to utilize all the energy stored in
the output capacitors between the 3.15V and 2.25V levels.
Diode D5 is an optional component used to Diode-OR multiple energy harvesting sources together. This diode would
be used in conjunction with one or more of the other Or-ing
diodes, D2, D3 or D4. When the Or-ing diodes are installed
the parallel jumper would not be populated. The diode
drop will be subtracted from the output voltage setpoint,
so it is recommended to change the feedback resistors
or select a higher output voltage setpoint to compensate
for the diode drop. When more than one of these diodes
is installed and the associated energy harvester inputs are
powered, the board will switch between energy harvester
power circuits as needed to maintain the output voltage.
dc2080af
14
DEMO MANUAL DC2080A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
3
C1, C7, C18
CAP, CHIP, X5R, 1µF, 10%, 6.3V, 0402
TDK, C1005X5R0J105KT
2
4
C2, C10, C24, C26
CAP, CHIP, X5R, 100µF, 20%, 10V, 1210
TAIYO YUDEN, LMK325ABJ107MM
15
C01 - C015 (OPTIONAL
ENERGY STORAGE)
3
1
C3
CAP, CHIP, X5R, 22µF, 10%, 25V, 1210
AVX, 12103D226KAT2A
4
1
C4
CAP, CHIP, X5R, 4.7µF, 10%, 6.3V, 0603, Height = 0.80mm
TDK, C1608X5R0J475K/0.80
5
3
C6, C27, C28
CAP, CHIP, X7R, 0.1µF, 10%, 16V, 0402
MURATA, GRM155R71C104KA88D
6
1
C8
CAP, CHIP, X7R, 330pF, 50V, 10%, 0603
MURATA, GRM188R71H331KA01D
7
1
C11
CAP, CHIP, X7R, 1000pF, 50V, 10%, 0603
MURATA, GRM188R71H102KA01D
8
4
C12, C13, C16, C23
CAP, POLYMER SMD, 220µF, 6.3V, 18mΩ, 2.8Arms, D2E CASE
SANYO, 6TPE220MI
9
1
C14
CAP, CHIP, X5R, 2.2µF, 16V, 10%, 0603
MURATA, GRM188R61C225KE15D
10
2
C15, C17
CAP, CHIP, X5R, 10µF, 10%, 6.3V, 0805
AVX, 08056D106KAT2A
11
2
C19, C20
CAP, CHIP, NPO, 33pF, 5%, 25V, 0402
AVX, 04023A330JAT2A
12
1
C21
CAP, CHIP, X5R, 4.7µF, 10%, 16V, 0805
TAIYO YUDEN, EMK212BJ475MG-T
13
1
C22
CAP, CHIP, X5R, 1µF, 10%, 16V, 0603
AVX, 0603YD105KAT2A
14
1
C25
CAP, CHIP, NPO, 47pF, 5%, 25V, 0402
AVX, 04023A470JAT2A
15
1
C29
CAP, CHIP X5R, 10µF,10%, 25V,1210
AVX, 12103D106KAT2A
16
1
D1
DIODE, STANDARD, 200V, 1.5A, SMP
VISHAY, AS1PD-M3/84A
17
1
D6
SANYO, AMORPHOUS SOLAR CELL
SANYO, AM-5412
18
1
HS1
HEAT SINK, 50.8mm × 50mm
FISCHER, SK 426
19
1
L1
INDUCTOR, 22µH , 0.70A, 185mΩ, 4.8mm × 4.8mm
WÜRTH, 744043220
20
1
L2
INDUCTOR, 10µH, 560mA, 0.205Ω, 3.8mm × 3.8mm
WÜRTH, 744031100
21
1
L3
INDUCTOR, 22µH, 270mA, 1.48Ω, 2.8mm × 2.87mm
WÜRTH, 744028220
22
1
T1
TRANSFORMER, 100:1 TURNS RATIO
WÜRTH, 74488540070
23
1
TEG1
PELTIER MODULE CP85438
CUI INC., CP85438
24
1
Q3
N-CHANNEL MOSFET, 20V, SOT23
DIODES/ZETEX, ZXMN2F30FHTA
25
11
R1, R3, R5, R6, R8, R16,
R17, R26, R27, R28, R35
RES, CHIP, 0Ω JUMPER, 1/16W, 0402
VISHAY, CRCW04020000Z0ED
26
2
R13, R21
RES, CHIP, 499kΩ, ±1%, 1/16W, 0402, ±100ppm/°C
VISHAY, CRCW0402499KFKED
27
1
R19
RES, CHIP, 392kΩ, ±1%, 1/16W, 0402, ±100ppm/°C
VISHAY, CRCW0402392KFKED
28
1
R20
RES, CHIP, 750kΩ, ±1%, 1/16W, 0402, ±100ppm/°C
VISHAY, CRCW0402750KFKED
29
1
R23
RES, CHIP, 200kΩ, ±1%, 1/16W, 0402, ±100ppm/°C
VISHAY, CRCW0402200KFKED
30
1
R24
RES, CHIP, 1.10MΩ, ±1%, 1/16W, 0402, ±100ppm/°C
VISHAY, CRCW04021M10FKED
31
1
R25
RES, CHIP, 549kΩ, ±1%, 1/16W, 0402, ±100ppm/°C
VISHAY, CRCW0402549KFKED
32
1
R29
RES, CHIP, 1.96MΩ, ±1%, 1/16W, 0402, ±100ppm/°C
VISHAY, CRCW04021M96FKED
33
1
R30
RES, CHIP, 1.15MΩ, ±1%, 1/16W, 0402, ±100ppm/°C
VISHAY, CRCW04021M15FKED
34
1
R34
RES, CHIP, 40.2kΩ, ±1%, 1/16W, 0402, ±100ppm/°C
VISHAY, CRCW040240K2FKED
35
1
U1
PIEZOELECTRIC ENERGY HARVESTING POWER SUPPLY,
DFN 3mm × 3mm
LINEAR TECH., LTC3588EMSE-1
36
1
U2
IC, ULTRALOW POWER SUPERVISOR WITH POWER-FAIL
OUTPUT, TSOT-23, 8-PIN
LINEAR TECH., LTC2935CTS8-2
dc2080af
15
DEMO MANUAL DC2080A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
37
1
U3
IC, ULTRALOW VOLTAGE STEP-UP CONVERTER AND POWER
MANAGER, DFN 3mm × 4mm
LINEAR TECH., LTC3108EDE
38
1
U4
IC, 400mA STEP-UP DC/DC CONVERTER WITH MPPC AND
250mV START-UP, DFN 3mm × 3mm
LINEAR TECH., LTC3105EDD
39
1
U5
IC, 10V MICROPOWER SYNC BOOST CONVERTER,
DFN 2mm × 2mm
LINEAR TECH., LTC3459EDC
40
1
U6
IC, ULTRALOW POWER SUPERVISOR WITH POWER-FAIL
OUTPUT, TSOT-23, 8-PIN
LINEAR TECH., LTC2935CTS8-4
MURATA, GRM155R71C104KA88D
Additional Demo Board Circuit Components
1
0
C5 (OPT)
CAP, CHIP, X7R, 0.1µF, 10%, 16V, 0402
2
0
C9 (OPT)
OPT, 0603
3
0
D2 - D5 (OPT)
DIODE, SCHOTTKY, 40V, 1A, SOD-123
DIODES INC, 1N5819HW-7-F
4
0
Q1, Q2 (OPT)
N-CHANNEL MOSFET, 20V, SOT23
DIODES/ZETEX, ZXMN2F30FHTA
5
0
R1 (OPT)
RES, CHIP, 4.99KΩ, ±1%, 1/16W, 0402, ±100ppm/°C
VISHAY, CRCW04024K99FKED
6
0
R2, R7, R9, R10, R11, R12, RES., CHIP, 0402
R14, R15, R18, R31, R32,
R33, R36
NOPOP
7
0
R4 (OPT)
RES, CHIP, 50.5kΩ, ±1%, 1/16W, 0402, ±100ppm/°C
VISHAY, CRCW040250K5FKED
8
0
R22 (OPT)
RES, CHIP, 2.80MΩ, ±1%, 1/16W, 0402, ±100ppm/°C
VISHAY, CRCW04022M80FKED
Hardware for Demo Board Only
1
14
E1 - E14
TURRET, 0.061 DIA
MILL-MAX, 2308-2
2
10
JP1 - JP8, JP11, JP12
HEADER, 2 PINS, 2mm
SAMTEC, TMM-102-02-L-S
3
2
JP9, JP10
HEADER, 3 PINS, 2mm
SAMTEC, TMM-103-02-L-S
4
3
JP4, JP9, JP11
SHUNT 2mm
SAMTEC, 2SN-BK-G
5
0
JP1, JP2, JP3, JP5, JP6,
JP7, JP8, JP10, JP12
SHUNT 2mm, (DO NOT INSTALL)
SAMTEC, 2SN-BK-G
6
1
J1
HEADER, 2×10, 20-PIN, SMT HORIZONTAL SOCKET, 0.100"
SAMTEC, SMH-110-02-L-D
7
0
J2 (OPT)
HEADER, 2×6, 12-PIN, SMT HORIZONTAL SOCKET WITH KEY,
0.100"
SAMTEC, SMH-106-02-L-D-05
8
1
J3
PIEZO CONNECTOR 4 PIN, TERMINAL BLOCK, WR-TBL
WÜRTH, 691411710002
9
4
ADHESIVE CABLE MOUNT U-STYLE CLIP
WÜRTH, 523252000
10
1
KERAFOL, KL 90 40mm × 40mm × 3mm DOUBLE-SIDED
ADHESIVE TAPE
KERATHERM, KL 90 40mm × 40mm
× 3mm
11
0.007
DOUBLE-SIDED MOUNTING TAPE, 35mm × 38mm FOR SOLAR
CELL
TESA, 55742 (KIT QTY = NUMBER OF
REELS, ROUND UP)
dc2080af
16
A
B
C
E2
J3
PZ1
PZ1
PZ2
PZ2
3
4
1
2
PZ1
VIN
E3
E8
E7
MPPC
E6
E5
BGND
TP5
BGND
+
+
5
4
R34
40.2k
D1
1.5A/200V
AS1PD
SMP
VOUT2
C12
220uF
6.3V
D2E CASE
1:100
C23
220uF
6.3V
D2E CASE
C24
100uF
10V
1210
20%
PGOOD_LTC3105
D2E CASE
C16
220uF
6.3V
VOUT2_EN
+
2
50V
1nF
C11
4
8
5
6
SHDN
NOPOP
R33
0
R28
PGOOD
MPPC
VIN
U4
LTC3105EDD
R32
NOPOP
0
R31
NOPOP
R27
L2
VOUT2_EN
OPT
0603
C9
R8
0
R2
NOPOP
7
8
9
10
11
12
SW
AUX
FBLDO
LDO
FB
VOUT
C22
1uF
16V
0603
TP8
AUX
4
3
2
1
RST
MR
VCC
GND PFO
S0
S1
S2
5
6
7
8
4
R25
549k
R19
392k
8
9
VAUX
6
5
4
3
2
1
C27
0.1uF
16V
3
C28
0.1uF
16V
+
LDO
SHDN
FB
VOUT
4
2
BGND
VSTORE
R29
R30
1.15 MEG
1
25V
3
1
2
1
C26
100uF
10V
1210
20%
D4
1
1
1N5819HW
SOD-123
OPT
2
D5
VOUT_LTC3459
JP4
LTC3459EDC
SUPPLIED BY
SOLAR CELL
OPT
1N5819HW
SOD-123
2
VOUT_LTC3105
JP3
LTC3105EDD
SUPPLIED BY DIODE
VOLTAGE DROP
1N5819HW
SOD-123
OPT
D3
VOUT_LTC3108
JP2
LTC3108EDE TEG
POWERED ENERGY
HARVESTER
VOUT = 3.3V
R23
200k
C25
47pF
VOUT = 3.3V
D2
1N5819HW
SOD-123
OPT
2
VOUT_LTC3588-1
JP1
BGND
VMCU
VMCU
VSTORE
E11
E10
E12
R12
NOPOP
R7
NOPOP
12
10
8
6
4
2
VMCU
V+
+5V
I/O 2
RSVD
KEY
GND
VSUPPLY
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CO12
100uF
10V
1210
20%
CO11
100uF
10V
1210
20%
11
9
7
5
3
1
2
1
4
3
RST
MR
VCC
R14
SCALE = NONE
BS
NC
APPROVALS
NOPOP
R36
0
R35
NOPOP
U2
GND PFO
S0
S1
S2
8
5
6
7
PGOOD
NC
ACC_ZOUT
ACC_YOUT
ACC_XOUT
ACC_SELFTEST
ACC_#SLEEP
HGND
SOT23
IC NO.
DATE: 1 - 8 - 13
N/A
SIZE
1
SHEET
DEMO CIRCUIT 2080A
1
OF
1
1
R EV.
ENERGY HARVESTING MULTI-SOURCE DEMOBOARD
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
2. INSTALL SHUNTS AS SHOWN.
1. ALL RESISTORS ARE 0402, 1%, 1/16W
ALL CAPACITORS ARE 0402, 10%
NOTE: UNLESS OTHERWISE SPECIFIED
C6
0.1uF
16V
1
Q3
ZXMN2F30FH
E9
BS
EM HEADER 2X10
CO15
100uF
10V
1210
20%
CO10
100uF
10V
1210
20%
CO5
100uF
10V
1210
20%
DATE
1 - 8 - 13
APPROVED
NO CONNECT (USB Power)
NO CONNECT (3.3V Board Power)
RF_#INT
RF_WAKE
RF_#RESET
SPI_MISO
SPI_MOSI
SPI_CLK
SPI_#CS
VMCU
CO14
100uF
10V
1210
20%
CO9
100uF
10V
1210
20%
CO4
100uF
10V
1210
20%
VSTORE_1
PRODUCTION FAB
TECHNOLOGY
/RST
17
15
16
14
9
13
11
18
20
3
5
7
6
4
8
10
2
1
REVISION HISTORY
DESCRIPTION
SAMTEC-SMH-110-02-L-D
HGND
J1
CO13
100uF
10V
1210
20%
CO8
100uF
10V
1210
20%
CO3
100uF
10V
1210
20%
TITLE: SCHEMATIC
E13
CO7
100uF
10V
1210
20%
CO6
100uF
610V
1210
20%
HGND
CO2
100uF
10V
1210
20%
LTC2935CTS8-2
SMH-106-02-L-D-05
1
-
OPTIONAL ENERGY STORAGE
REV
ECO
CO1
100uF
10V
1210
20%
3.3V, < 50 mA
DUST HEADER 2X6
I/O 1
EHORBAT
VBAT
PGOOD
NC
CUSTOMER NOTICE
R11
NOPOP
R6
0
JP8
JP7
JP6
JP5
VSTORE
J2 OPT
OFF
OFF
JP10
ON
JP9
CAUTION:
ONLY JP9 OR JP10
MAY BE ON AT
ANY TIME
ON
2
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
R10
NOPOP
R5
0
PGOOD_LTC3459
PGOOD_LTC3105
PGOOD_LTC3108
PGOOD_LTC3588-1
(HIGH-IMPEDANCE AC SOURCES)
LTC3588EMSE-1 PIEZOELECTRIC
ENERGY HARVESTER
VOUT = 3.3V
3
VOUT = 3.3V
TP2
TP1
1210
20%
10V
C2
100uF
1.96 MEG
R22
2.80M
OPT
Q2
ZXMN2F30FH
OPT
C18
1uF
6.3V
L3
22uH
WURTH, 744028220
C21
4.7uF
16V
0805
C17
10uF
6.3V
0805
10V
1210
20%
C10
100uF
C13
220uF
6.3V
D2E CASE
C7
1uF
6.3V
Q1
ZXMN2F30FH
OPT
R4
50.5K
OPT
R1
0.00
4.99K IS OPT
PGOOD_LTC3108
C14
2.2uF
16V
0603
TP3
VLDO
VOUT2
VAUX
1
C5
0.1uF
16V
OPT
L1
22uH
WURTH, 744043220
PGOOD_LTC3588-1
10
6
5
U5
LTC3459EDC
1.1M
R24
R20
750k
PGD
VLDO
VOUT2
VOUT
VSTORE
D1
D0
PGOOD
SW
GND
PZ2
PZ1
VOUT
2
1
VIN2
CAP
VIN
C20
33pF 25V
C19
33pF
25V
11
7
U6
LTC2935CTS8-4
10
3
2
R21
499k
1
9
7
VS2
VS1
VOUT2_EN
C1
C2
SW
U3
LTC3108EDE
R9
NOPOP
C4
4.7uF
6.3V
0603
3
4
U1
LTC3588EMSE -1
C1 1uF
6.3V
R3
0
10uH
WURTH, 744031100
R18
NOPOP
R16
0
0
SHDN
TP9
C15
10uF
0805
6.3V
R17
0
R15
NOPOP
VAUX
0603 50V
330pF
C8
R13 499K
1
1
3.6V
0603
1
0
3.3V
C3
22uF
25V
1210
R26
T1
WURTH, 74488540070
3
0
1
0
0
D1
D0
1
2.5V
1.8V
OUTPUT VOLTAGE SETTINGS
VOUT
JP12
PIEZO
C29
10uF
25V
1210
D6 (SOLAR PANEL)
AM-5412
TP7
TP6
BGND
VOUT2
TP4
VOUT2_EN
E14
BGND
VIN SOLAR
1.72V - 3.3V
BGND
+VIN
4 - 20mA
LOOP
BGND
E4
20mV - 400mV
TEG1
PELTIER MODULE
CP85438
< = 50mA
< = 5mA
> 18Vpk
IIN
VIN *
< = 18Vpk
JP11
PMDM
PIEZO CONNECTOR
*
BLACK (-)
D
VIN
RED (+)
1
POS (+)
1
2
1
2
NEG (-)
2
GND
11
GND
13
3
PZ2
1
VIN
GND
2
6
SW
GND
19
E1
GND
GND
1
12
4
GND
5
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
3
2
3
2
5
A
B
C
D
DEMO MANUAL DC2080A
Schematic Diagram
dc2080af
17
DEMO MANUAL DC2080A
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
dc2080af
18 Linear Technology Corporation
LT 0613 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2013