DC2343A - Demo Manual

DEMO MANUAL DC2343A
LTC3335
Nanopower Buck-Boost DC/DC
with Integrated Coulomb Counter
Description
Demonstration circuit DC2343A is a complete system level
solution for a nanopower buck-boost DC/DC with integrated
coulomb counter. The DC2343A contains a PIC16F1459
embedded processor for communication to the PC over
USB and the LTC®3335 via its I2C port. The GUI is capable of
reading and writing all the control registers on the LTC3335
as well as displaying and resetting all its alarm registers.
The firmware and software for the embedded system and
the GUI are available at the LTC3335 solutions page. The
DC2343A uses two analog-to-digital converter channels
to sample the battery and output voltages. The voltage
samples improve the functionality of the GUI, and allow
optimal software correction to the measured coulombs.
By adding the software correction the first order known
errors are compensated for over the operating range and
the resultant coulomb count is accurate to within 3%.
The DC2343A contains an LTC3335 which is a high efficiency, low quiescent current (680nA) buck-boost DC/DC
Performance Summary
PARAMETER
converter with an integrated precision coulomb counter
which monitors accumulated battery discharge in long life
battery powered applications. The buck-boost can operate
down to 1.8V on its input and provides eight pin selectable
output voltages with up to 50mA of output current. The
coulomb counter stores the accumulated battery discharge
in an internal register accessible via an I2C interface.
The LTC3335 features a programmable discharge alarm
threshold. When the threshold is reached, an interrupt is
generated at the IRQ pin. To accommodate a wide range
of battery types and sizes, the peak input current can be
selected from as low as 5mA to as high as 250mA and
the full-scale coulomb counter has a range from 1.1mAh
(with 5mA IPEAK) to 1793Ah (with 250mA IPEAK).
Design files for this circuit board are available at
http://www.linear.com/demo/DC2343A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Specifications are at TA = 25°C
CONDITIONS
Input Supply Range, VBAT
MIN
TYP
MAX
1.8
-
5.5
UNITS
V
Buck-Boost Peak Current Limit
L1 = 100µH, R1 = R4 = R5 = Installed
100
mA
VOUT Output Voltage
OUT2 = 1, OUT1 = OUT0 = 0
3.3
V
15
mA
86
%
Max Output Current
Efficiency
VBAT = 3.6V, VOUT = 3.3V, IOUT = 10mA
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1
DEMO MANUAL DC2343A
Operating Principle
The demo board is pictured in Figure 2a and Figure 2b,
with schematics shown in Figure 18 and Figure 19. The
provided USB cable connects the demo board to the PC.
With Linear Technology’s QuikEval™ program running in
the background of the PC, a five windowed GUI, pictured
in Figure 6 will pop up.
The GUI sends high level commands to the onboard
microcontroller via the USB interface. The GUI receives
the raw LTC3335 register values and converts them into
application values, which are easily understood by the
user. The GUI also writes to the internal registers to set the
accumulator value and the accumulator alarm threshold.
The board is shipped with a peak buck-boost inductor
current of 100mA and an output voltage setting of 3.3V.
The board is configurable via jumpers to set the output
voltage between 1.8V and 5V. Using a soldering iron to
change the location of some 0Ω resistors and a different
value inductor for the buck-boost converter, the board
can be modified to accommodate 5mA to 250mA peak
inductor current settings. This flexibility is very helpful
when working with higher-impedance batteries such as
the Tadiran primary lithium-thionyl chloride (Li-SOCl2)
long life batteries.
The demo board can be controlled by the GUI or by
an external processor. When the jumper assembly on
JP5 is in the B-C location the internal processor is connected to the LTC3335 device and the GUI is able to
monitor the status of the registers. The B-C location is
the default for the DC2343A, as the PIC16 may consume
current if left connected to the LTC3335 without the
USB cable attached. When the jumper assembly on JP5
is moved to the A-B location, the onboard processor is
2
disconnected from the LTC3335. When in this location row
C pins can be used to control and monitor the LTC3335
via an external processor.
The measurement of the VBAT and the VOUT voltages is
done with a sampled ADC reading to minimize power
dissipation and maintain the available accuracy from the
processor ADC. Refer to page two of the schematic and
the VBAT voltage measurement components for the following discussion. Resistor R18 and capacitor C11 form
a 1.6kHz low-pass filter to remove the high frequency
switching noise from the VBAT measurement. M1 is a
combination of a PFET and NFET configured with the
PFET as a pass device and the NFET along with resistor
R24 performing the function of a level translator to turn
on and off the PFET with the GN1 signal. This allows the
use of relatively low valued resistors (R25 and R26) as
the divider resistors into the ADC. The divider resistors
are needed to keep the input signal within the input range
of the ADC (0V to 4.096V). For the processor used on the
board the, input resistance to the ADC is recommended
to be less than or equal to 10kΩ. Both voltage sampling
circuits (VBAT and VOUT) are controlled by the same signal.
At a 3 second sampling rate, the PFETs are turned on for
120µs to perform the ADC conversions. Performing both
conversions within 120µs every 3 seconds can add as much
as 35nA to the input current under worst-case conditions
when the battery is at 1.8V and the output voltage is set
to 5V. Under normal operation where the battery is 3.6V
and the output voltage is 3.3V, the voltage sampling adds
approximately 15nA to the input current.
For a more details about the operation of the LTC3335 IC
please, refer to the LTC3335 data sheet.
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DEMO MANUAL DC2343A
Operating Principle
100
90
EFFICIENCY (%)
80
70
60
50
40
30
VOUT = 1.8V
VOUT = 2.5V
VOUT = 3.3V
VOUT = 5V
20
10
0
0.001
0.01
0.1
1.0
ILOAD (mA)
BAT = 3.6V
L = 100µH
DCR = 0.6Ω
10
100
DC2343A F01
Figure 1. LTC3335 Buck-Boost Efficiency vs Load Current
and VOUT for 100mA IPEAK Setting
(a) Top
(b) Bottom
Figure 2. DC2343A Demo Board Pictures
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3
DEMO MANUAL DC2343A
Quick Start Procedure
Refer to Figure 3 for the proper measurement and equipment setup. Use twisted pair leads for the power connections and the LOAD, and connect the equipment with the
power supply OFF. Follow the procedure below.
4. When the DC2343A is connected to the PC, the PIC16
indicates it is powered through its board status LEDs.
These LEDs are also replicated in the GUI, to indicate
the state of the PCB.
1. To use the DC2343A, the PC must first have the
proper software driver and GUI installed. Download
the QuikEval software from www.linear.com and install the QuikEval software by running the executable
ltcqev.exe. Follow the instructions to connect the
DC2343A.
5. Set PS1 to 5V. The DC2343A will see battery voltage
and flash the green LED with a 1 second period. The
GUI will then launch the window in Figure 8 to ask
for a battery description. Typically the characteristics
of an actual battery would be entered. For a quick
demonstration of the LTC3335, however, enter these
values to simulate a very small battery with power
supply PS1:
If you fail to unplug the DC2343A, the DC2343A driver
will not install! When installation of QuikEval is complete, close the QuikEval program.
2. Move jumper JP5 on the DC2343A from the A-B position to the B-C position to enable the communication
from the PIC16 to the LTC3335 device.
3. Reopen QuikEval, and then connect the DC2343A
to confirm that the QuikEval software was installed
correctly. If properly installed, QuikEval will show the
following message:
The green LED flashes quickly when a board is connected but its VBAT input is not powered, and slowly
when a board is connected with voltage applied to
VBAT. The amber LED turns on when the PIC16 is
communicating with the LTC3335.
a. Battery Capacity (Ah) = 0.02
b. Battery Coulombs (% Discharged) = 0.00
Battery Alarm (% Discharged) = 80.00
6. Set LOAD1 to 20mA:
The accumulator counter will increment every 49.4
seconds as calculated below:
Battery Capacity = 20mA•hr
Input Current = 6.26mA
Total Counts to 100% = 233
Secs per Accumulator Increment =
Press OK to download and open the software for the
DC2343A. Once the software has been installed, the GUI
will launch automatically. Close the QuikEval software,
as it is no longer needed for the DC2343A.
4
Battery Capacity
1
s
•
• 3600
Input Current Total Counts to 100%
hr
Secs per Accumulator Increment = 49.363 sec
7. The GUI can also show an estimated battery current.
In order to demonstrate that GUI feature. Activate the
battery current measurement feature described in
Figure 12, item 7. In order to implement this feature,
the PIC16F1459 on the DC2343A counts edges on
the IRQ pin over time, which can then be converted
to coulombs per second.
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DEMO MANUAL DC2343A
Quick Start Procedure
Measured (mA)
VOUT / VBAT
1.8
2
2.5
3
3.5
4
4.5
5
5.5
1.8
20.63
22.13
25.08
27.40
29.23
30.78
32.09
33.25
34.26
2.5
17.68
19.18
22.18
24.55
26.53
28.17
29.62
30.93
32.04
2.8
16.62
18.07
21.06
23.43
25.42
27.11
28.56
29.86
31.07
3
15.94
17.39
20.34
22.71
24.69
26.38
27.88
29.23
30.39
3.3
15.02
16.42
19.37
21.69
23.67
25.42
26.91
28.27
29.48
3.6
14.20
15.55
18.45
20.77
22.76
24.45
26.00
27.35
28.56
4.5
12.14
13.43
16.13
18.36
20.29
21.98
23.48
24.88
26.09
5
11.23
12.46
15.02
17.20
19.10
20.77
22.27
23.67
24.93
Figure 3. Measured Maximum Output Current vs VOUT and VBAT for IPEAK = 100mA, L1 = 100µH
Figure 4. Proper Measurement Equipment Setup
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5
DEMO MANUAL DC2343A
Quick start Procedure
Figure 5. Measuring Input or Output Ripple
Using the LTC3335 Software
The DC2343A GUI consists of five windows:
1. The Control Panel Window displays the components
on the DC2343A PCB and their relationship with the
user’s battery. The other four windows are shown by
clicking or double clicking on the controls circled on
the control panel in Figure 6.
2. The Battery Selection Window allows the user to specify
the battery that they have connected to the DC2343A.
This information is necessary for the GUI to properly
configure the LTC3335, and interpret the values read
from the IC. This window will automatically popup the
first time that a battery is attached to the DC2343A.
3. The EN Jumper Window displays the options for
JP1 on the DC2343A. The position of this jumper is
not important to the operation of the GUI, although
6
communication with the LTC3335 is not possible unless this jumper is in the ON position.
4. The OUT Jumpers Window displays the options for
JP2–JP4 on the DC2343A. The position of this jumper
is not important to the operation of the GUI. It will
only specify the output voltage when the LTC3335 is
configured for HARDWARE_CONTROL (default).
5. The IPEAK Selection Window configures the GUI so
that it will properly interpret the values read from
the LTC3335. It is set to the factory configuration of
100mA by default. If a user modifies the IPEAK setting
by changing L1 and R1–R6 on the DC2343A, they
must reconfigure the PCB through this screen for the
GUI to continue interpreting the values read from the
LTC3335 properly.
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DEMO MANUAL DC2343A
Using the LTC3335 Software
Figure 6. DC2343A GUI Navigation
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7
DEMO MANUAL DC2343A
Using the LTC3335 Software
The Control Panel Window displays the components on
the DC2343A PCB and their relationship with the user’s
battery. The features of this window are shown in Figure 7.
1. This graphic shows the relationship between the user’s
battery and the LTC3335 coulomb counter. When the
LTC3335 is properly configured, the battery capacity
will always be between 128 and 255 counts. The green
line represents the accumulator value, the red line represents the alarm value, and the black line represents
the battery capacity. These lines can be clicked and
dragged to modify the LTC3335 register values.
2. These indicators display the battery characteristics as
a % of capacity and in Ah.
3. The indicators display the resolution and range of
the LTC3335 coulomb counter for its given IPEAK and
prescaler configuration. The range text will be red if
the LTC3335 is configured for a range that is less than
100% the battery’s capacity. The resolution text will
be red if the LTC3335 is not configured for at least
0.78% the battery’s capacity per count.
4. These indicators show the values of the LTC3335 inputs for which the GUI has been configured. Clicking
these inputs will bring up a window where they can be
changed. Only the IPK[2:0] bits affect the operation of
the GUI.
5. Checking this box will expose additional controls for
the LTC3335. See the control panel advanced mode
in Figure 12.
6. The indicators show the status of the PGOOD and IRQ
outputs from the LTC3335.
7. Checking this box will expose additional controls for
the PIC16F1459. See the Control Panel Advanced Mode
in Figure 12.
8
8. GUI Events are recorded in this log, such as battery
connection, modification of LTC3335 registers, and
changes of the PGOOD and IRQ outputs. The log can
be maintained after the GUI is exited, to create a record
over a long time in which GUI is periodically used to
monitor a DC2343A.
9. The PIC16F1459 measurements of the VBAT and VOUT
voltages are presented here. Note that these ADC
measurements can consume up to 35nA of the battery
current, and will occasionally cause the LTC3335 to
turn on in order to replace the charge lost from VOUT
when the ADC measurement is done.
10.The status LEDS provide information about the
DC2343A operation. Their behavior mirrors the LEDS
on the DC2343A PCB.
• The green LED will flash quickly if a DC2343A is not
attached or if a battery is not present. It will flash
slowly if the DC2343A is attached with a battery in
an acceptable range for the DC2343A.
• The amber LED will flash each time the PIC16F1459
communicates with the LTC3335.
11.The typical error is displayed for the current IPEAK, VBAT,
and VOUT conditions of the LTC3335. If the checkbox is
selected to correct the coulomb count with software,
the accumulator will be adjusted by the typical error to
reduce this error. See the Software Coulomb Counter
Correction section for information about software error
correction.
12.These buttons provide links to the LTC website for
information about the LTC3335 IC and the DC2343A
software.
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DEMO MANUAL DC2343A
Using the LTC3335 Software
Figure 7. Control Panel Window
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9
DEMO MANUAL DC2343A
Using the LTC3335 Software
The Battery Selection Window allows the user to specify
the battery that they have connected to the DC2343A. This
information is necessary for the GUI to properly configure
the LTC3335, and interpret the values read from the IC.
This window will automatically popup the first time that
a battery is attached to the DC2343A. Note that none of
the values in this value will be written to the LTC3335
until the OK button is pressed, allowing experimentation
by the user to see the relationship between their battery
characteristics and the LTC3335 settings. The features of
this window are shown in Figure 8.
1. This graphic shows the relationship between the user’s
battery and the LTC3335 coulomb counter. When the
LTC3335 is properly configured, the battery capacity
will always be between 128 and 255 counts. The green
line represents the accumulator value, the red line represents the alarm value, and the black line represents
the battery capacity. These lines can be clicked and
dragged to modify the LTC3335 register values.
2. These indicators display the battery characteristics as
a % of capacity and in Ah.
3. The indicators display the resolution and range of
the LTC3335 coulomb counter for its given IPEAK and
Prescaler configuration. This range text will be red if
the LTC3335 is configured for a range that is less than
10
100% the battery’s capacity. This resolution text will
be red if the LTC3335 is not configured for at least
0.78% the battery’s capacity per count.
4. The battery characteristics are the simplest method of
configuring the LTC3335. Enter the battery capacity in
Ah to set the LTC3335 prescaler to the value that provides enough range for that battery while maintaining
the highest possible resolution. Enter the discharged
capacity and alarm threshold as a % of battery capacity.
5. Alternatively, the LTC3335 prescaler, accumulator,
and alarm values can be set directly. The battery
characteristics will be updated to show the physical
meaning of the LTC3335 units.
6. The typical error is displayed for the current IPEAK, VBAT,
and VOUT conditions of the LTC3335. If the checkbox is
selected to correct the coulomb count with software,
the accumulator will be adjusted by the typical error to
reduce this error. See the Software Coulomb Counter
Correction section for information about software error
correction.
7. Press the OK button to write the LTC3335 configuration
selected in this window to the DC2343A and return to
the control panel. Press cancel to return to the control
panel without modifying the DC2343A configuration.
dc2343af
DEMO MANUAL DC2343A
Using the LTC3335 Software
Figure 8. Battery Selection Window
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11
DEMO MANUAL DC2343A
Using the LTC3335 Software
The EN Jumper Window displays the options for JP1 on
the DC2343A. The position of this jumper is not important
to the operation of the GUI, although communication with
the LTC3335 is not possible unless this jumper is in the
ON position. The features of this window are shown in
Figure 9.
1. Click on one of the three options (ON, EXT, or OFF ) to
inform the GUI of the position of this jumper. Although
this selection is displayed in the GUI, it is not used by
any calculations and is unimportant to GUI operation.
2. Press the OK button to write the EN jumper position
selected in this window to the DC2343A and return to
the control panel. Press Cancel to return to the control
panel without modifying the DC2343A configuration.
Figure 9. EN Jumper Window
12
dc2343af
DEMO MANUAL DC2343A
Using the LTC3335 Software
The OUT Jumpers Window displays the options for JP2
– JP4 on the DC2343A. The position of these jumpers
are not important to the operation of the GUI. It will only
specify the output voltage when the LTC3335 is configured
for HARDWARE_CONTROL (default). The features of this
window are shown in Figure 10.
1. Click on one of the eight options to inform the GUI of
the position of the jumpers specify the output voltage
when the LTC3335 is configured for HARDWARE_CONTROL. Although this selection is displayed in the GUI,
it is not used by any calculations and is unimportant
to GUI operation.
2. Press the OK button to write the OUT jumper positions
selected in this window to the DC2343A and return to
the control panel. Press Cancel to return to the control
panel without modifying the DC2343A configuration.
Figure 10. OUT Jumpers Window
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13
DEMO MANUAL DC2343A
Using the LTC3335 Software
The IPEAK Selection Window configures the GUI so that it
will properly interpret the values read from the LTC3335.
It is set to the factory configuration (100mA) by default.
If a user modifies the IPEAK setting by changing L1 and
R1 – R6 on the DC2343A, they must reconfigure the PCB
through this screen for the GUI to interpret the values
read from the LTC3335. The features of this window are
shown in Figure 11.
1. Select one of the eight options to inform the GUI of
the population of the resistors which configure the
IPEAK setting of the LTC3335. The other controls on
this window will update to show the proper resistors
and inductor population for the selected IPEAK setting.
2. Double click the resistors to inform the GUI which
are populated on the DC2343A. The IPEAK setting corresponding to the selected resistors will be displayed
as well as the corresponding inductor value.
3. Select one of the inductors to inform the GUI which
value is populated on the DC2343A. The of the population of the resistors which configure the IPEAK setting
of the LTC3335. The IPEAK setting corresponding to the
inductor will be displayed as well as the corresponding
resistor population.
4. Press the OK button to write the IPEAK configuration
selected in this window to the DC2343A and return to
the control panel. Press cancel to return to the control
panel without modifying the DC2343A configuration.
Figure 11. IPEAK Selection Window
14
dc2343af
DEMO MANUAL DC2343A
Using the LTC3335 Software
When the Show Advanced Options checkbox is selected
for the LTC3335 and PIC16F1459 on the control panel,
several additional controls are exposed to the user. These
controls are in Figure 12.
1. The estimated battery current is displayed when the
battery current estimate button is turned on with the
button in item 7.
2. The registers in the LTC3335 can be written and read
directly with these input fields.
3. These checkboxes display which alarms are currently
active in the LTC3335. If an alarm is present, the clear
alarm button will allow it to be cleared if the alarm conditions are no longer present and the proper registers
have been reset.
4. The counter test can be turned on and off in this field,
with the number of IRQ edges per seconds displayed
below.
5. The serial number and firmware revision of the
PIC16F1459 are displayed in these fields.
6. The rate at which the GUI polls the LTC3335 is controlled
by this dropdown box. A special method of polling is
available where the Accumulator is only read following
a falling edge on the INT pin. When using this mode,
the alarm setting is not available to the user as it is
always set by the GUI to be one less than the current
accumulator value.
7. This button will turn on the counter test function, and
use the PIC16F1459 to convert the number of IRQ
edges per second into a battery current estimate.
Figure 12. Control Panel Window—Advanced Options
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15
DEMO MANUAL DC2343A
Software Coulomb Counter Correction
The LTC3335 accuracy is impressive when configured for
high values of IPEAK. When configured with low values
of IPEAK, however, there can be up to 40% error. The
DC2343A GUI contains algorithms to correct for this error
based upon the IPEAK, VOUT, and VBAT conditions of the
DC2343A. Although the GUI uses the sampled VOUT and
VBAT values for correction, most applications could use
fixed values for VOUT and VBAT if they are expected to be
relatively constant.
The standard population of the DC2343A is configured
for an IPEAK value of 100mA. The typical coulomb counter
error for this board is shown in Figure 13. As the LTC3335
is already accurate within ±2% in this configuration, there
is little value to software correction. Software correction is
also very difficult as the actual error can vary a lot about
the average error.
The typical coulomb counter error for the DC2343A reconfigured for an IPEAK of 5mA is shown in Figure 14. In
this configuration the LTC3335 can have significant errors
over 30%. Since the error is predictable and the actual
error varies little of the average error, the GUI is able to
apply a correction factor to the LTC3335 accumulator to
produce a more accurate coulomb count.
When software correction of the coulomb count is not
enabled in the battery selection window, the accumulator is simply multiplied by the expected resolution for the
LTC3335 IPEAK and prescaler values. If software correction
of the coulomb count is enabled in the battery selection
window, the expected resolution is adjusted by the typical
error so that the battery capacity, discharge, and alarm
values can be more accurate translated to values in the
LTC3335 accumulator. Figure 15 shows the effect of
enabling the software coulomb count correction in the
battery selection window. Since the LTC3335 is expected
to undercount 26.69% under the starting conditions, the
alarm and capacity values are decreased to reflect the
additional coulombs represented by each count in the
LTC3335 accumulator.
Clicking OK in the battery selection window will return the
GUI to the control panel. When using the software correction of the coulomb count in the control panel, the error
correction is continuously updated to reflect the different
error at the different battery conditions. In addition, the
quiescent current drawn by the LTC3335 is taken into account by the GUI. For this reason, the coulomb count in
the battery graphic can become unsynchronized with the
accumulator value in the LTC3335 as shown in Figure 16.
The worst case of the this would occur if the LTC3335 were
left for a very long time with no load as the battery would
eventually become 100% discharged due to quiescent
losses although the accumulator would remain at 0. This
worst case scenario, however, would take several years to
complete with most batteries. An example of a discharge
with and without software coulomb count correction is
shown in Figure 17.
–10
2.0
COULOMB COUNTER ERROR (%)
COULOMB COUNTER ERROR (%)
2.5
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
ACTUAL ERROR
AVERAGE ERROR
–2.0
–2.5
1.8
2.3
2.8
3.3
3.8
VBAT (V)
4.3
4.8
5.3
DC2343A F13
Figure 13. Typical DC2343A Coulomb Counter
Error with IPEAK = 100mA
16
–15
–20
–25
–30
ACTUAL ERROR
AVERAGE ERROR
–35
1.8
2.3
2.8
3.8
3.3
VBAT (V)
4.3
4.8
5.3
DC2343A F14
Figure 14. Typical DC2343A Coulomb Counter
Error with IPEAK = 5mA
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DEMO MANUAL DC2343A
Software Coulomb Counter Correction
Figure 15. Effect of Software Coulomb Count Correction in Battery Selection Window
250
COULOMB COUNT WITH CORRECTION
ACTUAL COULOMB COUNT
COULOMB COUNT NO CORRECTION
LTC3335 ACCUMULATOR
0.0010
0.0008
200
150
0.0006
100
0.0004
50
0.0002
0
ACCUMULATOR COUNTS
DISCHARGED CAPACITY (Ah)
0.0012
0
1000
2000
3000
4000 5000
TIME (s)
6000
7000
0
8000
DC2343A F17
Figure 16. Software Correction Control Panel
Figure 17. Effect of Software Coulomb Count
Correction for Discharge with 5mA IPEAK
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17
DEMO MANUAL DC2343A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
1
C1
CAP, CHIP, X5R, 22µF, 20%, 6.3V, 1206
SAMSUNG, CL31A226MQHNNNE
2
1
C2
CAP, CHIP, X5R, 150µF, 20%, 6.3V, 1210
SAMSUNG, CL32A157MQVNNNE
3
1
C3
CAP, CHIP, X5R, 1000pF, ±10%, 50V, 0402
TDK, C1005X5R1H102K
4
2
C4, C5
CAP, CHIP, X5R, 10µF, ±20%, 6.3V, 0603
MURATA, GRM188R60J106ME47D
5
2
C6
CAP, CHIP, X7R, 0.1µF, ±10%, 50V, 0402
TDK, C1005X7R1H104KT
6
1
C7*
*RES, CHIP, 301,1/10W,1%,0603
VISHAY, CRCW0603301RFKEA
7
1
C8
CAP, CHIP, X5R, 0.47µF, ±10%, 16V, 0402
TDK, C1005X5R1C474K
8
2
C11, C12
CAP, CHIP, X5R, 1µF, ±10%, 25V, 0402
MURATA, GRM155R61E105KA12
9
1
D1
LED, YELLOW ORANGE CLEAR, 0603, SMD
LITE-ON, LTST-C190KFKT
10
1
D2
LED, GREEN CLEAR, 0603, SMD
LITE-ON, LTST-C190KGKT
11
1
L1
IND, SMT, 100µH, 0.600Ω, 310mA, 4.9mm × 4.9mm × 3mm COILCRAFT, LPS5030-104MRB
12
2
M1, M2
MOSFET, N/P-CH, LOW-THRESHOLD, 20V, 500mA, SC70-6
VISHAY, Si1553CDL
13
3
R1, R4, R5
RES, CHIP, 0Ω JUMPER, 1/10W, 0603
VISHAY, CRCW06030000Z0ED
14
3
R7, R8, R16
RES, CHIP, 10kΩ, ±5%, 1/16W, 0402
VISHAY, CRCW040210K0JNED
15
1
R9
RES, CHIP, 1kΩ, ±5%, 1/16W, 0402
VISHAY, CRCW04021K00JNED
16
1
R10
RES, CHIP, 1Ω, ±5%, 1/16W, 0402
VISHAY, CRCW04021R00JNED
17
1
R15
RES,CHIP, 301,1/10W,1%,0603
VISHAY, CRCW0603301RFKEA
18
1
R17
RES,CHIP, 10M,1/10W,5%,0603
VISHAY, CRCW060310M0JNEA
19
2
R18, R19
RES,CHIP, 100,1/10W,1%,0603
VISHAY, CRCW0603100RFKEA
20
2
R20, R21
RES, CHIP, 2kΩ, ±5%, 1/16W, 0402
VISHAY, CRCW04022K00JNED
21
2
R23, R24
RES,CHIP, 49.9k,1/10W,1%,0603
VISHAY, CRCW060349K9FKEA
22
2
R25, R27
RES,CHIP, 10.0k,1/10W,1%,0603
VISHAY, CRCW060310K0FKEA
23
2
R26, R28
RES,CHIP, 28.7k,1/10W,1%,0603
VISHAY, CRCW060328K7FKEA
24
1
U1
IC, SMT, NANOPOWER BUCK-BOOST WITH COULOMB
COUNTER, 3mm × 4mm, QFN-20
LINEAR TECH., LTC3335EUDC#PBF
25
1
U2
8-BIT MICROCONTROLLER WITH XLP USB, 4mm × 4mm,
QFN-20
MICROCHIP, PIC16F1459-I/ML
26
1
U3
µMODULE, ISOLATED USB TRANCEIVER WITH POWER,
15mm × 15mm × 5mm, BGA44
LINEAR TECH., LTM2884CY#PBF
Additional Demo Board Circuit Components
27
0
C9 (OPT), C10 (OPT)
CAP., X7R, 470PF, 250VAC, 10%, 1808
MURATA, GA342QR7GF471KW01L
28
0
C7 (OPT)
CAP, CHIP, X5R, 10µF, ±20%, 6.3V, 0603
MURATA, GRM188R60J106ME47D
29
0
R2-OPT, R3-OPT, R6-OPT RES, CHIP, 0Ω JUMPER, 1/10W, 0603
VISHAY, CRCW06030000Z0ED
30
0
R11, R12, R13, R14 (OPT) RES, CHIP, 0Ω, 2512, 1.0W
VISHAY, CRCW25120000Z0EG
Hardware: For Demo Board Only
31
4
E1, E2, E3, E4
TURRET, 0.09 DIA
MILL-MAX, 2501-2-00-80-00-00-07-0
32
6
E5, E6, E7, E8, E9, E10
TURRET, 0.061 DIA
MILL-MAX, 2308-2-00-80-00-00-07-0
33
1
JP1
HEADER, 2MM, 1×4 POS
SAMTEC, TMM-104-02-L-S
34
3
JP2, JP3, JP4
HEADER, 2MM, 1×3 POS
SAMTEC, TMM-103-02-L-S
35
4
JP1, JP2, JP3, JP4
SHUNT, 2MM
SAMTEC, 2SN-KB-G
36
1
J1
USB 2.0, MICRO-B, RECEPTACLE, RT, SMT
TE CONNECTIVITY, 1981568-1
18
dc2343af
DEMO MANUAL DC2343A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
37
1
J2
HEADER, 2×3, 2mm, THT, DUAL PIN
WURTH, 62000621121
38
1
J3
HEADER, 2.54mm, 12-PIN, DUST HEADER, 2×6,
KEY AT PIN #5
SAMTEC, SMH-106-02-L-D-05
39
1
JP5
HEADER UNSHROUDED, 3×6, THRU-HOLE, VERT, 2.54mm
SAMTEC, TSW-106-07-L-T
40
1
JP5 (MATE)
EMBEDDED µC CONNECT JUMPER (JP5 MATE)
LINEAR TECH, DC2343A-1-ASSY1
41
4
STAND-OFF, NYLON (SNAP ON), 0.375" TALL
KEYSTONE, 8832 (SNAP ON)
dc2343af
19
D
C
B
A
E7
E6
IRQ
PGOOD
SDA
SCL
DVcc
GND
DVCC
GND
EN
1
E10
E2
E5
GND
E1
VBAT
1.8V - 5.5V
1k
R9
VBAT
ON
EXT
OFF
EN
VBAT
1
4
2
2
3
JP1
2
R8
10k
5%
R7
10k
5%
C1
22uF
1206
6.3V
20%
U1
3
C3
1000pF
19
1
20
2
16
7
8
LPS5030-104MRB
L1 100uH
4
IPK2
IPK1
IPK0
OUT2
OUT1
OUT0
PGOOD
VOUT
PVOUT
DNP
0
JP2
0
1
JP3
OUT1
0
R4
0603
R3
0603
0
JP4
DNP
0
1
OUT0
R6
0603
R5
0603
VOUT
D
CUSTOMER NOTICE
OUT2 OUT1 OUT0 VOUT
0
0
0
1.8V
0
0
1
2.5V
0
1
0
2.8V
0
1
1
3.0V
1
0
0
3.3V
1
0
1
3.6V
1
1
0
4.5V
1
1
1
5.0V
5
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
D
IPK2
R2
R2
R2
R2
R1
R1
R1
R1
VBAT
6
SCALE = NONE
BJS
NC
APPROVALS
*OUTPUT VOLTAGE SELECTION
R2
0603
R1 DNP
0603
D = DEFAULT VALUE
0
1
OUT2
C2
150uF
1210
6.3V
20%
VOUT
6
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
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
15
14
13
3
4
5
18
12
11
5
Figure 18. DC2343A Demo Circuit Schematic
4
NOTES: UNLESS OTHERWISE SPECIFIED
1. RESISTORS: OHMS, 0402, 1%, 1/16W
2. CAPACITORS: 0402, 10%, 50V
IRQ
SDA
SCL
DVCC
EN
BAT
PBAT
LTC3335EUDC
9
SW1
3
GNDD
6
GNDA
17
10
SW2
PGND
20
21
1
DATE:
N/A
SIZE
06 - 30 - 15
IC NO.
L1
2200uH
1000uH
680uH
470uH
220uH
100uH
68uH
47uH
SMH-106-02-L-D-05
DUST HEADER 2X6
+5V
I/O 2
RSVD
KEY
GND
VSUPPLY
GND
PGOOD
GND
3.3V
15mA
VOUT *
11
9
7
5
3
1
DATE
06 - 30 - 15
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
V+
I/O 1
EHORBAT
VBAT
PGOOD
NC
E9
E8
E4
E3
BJS
APPROVED
8
7
LTC3335EUD
DEMO CIRCUIT 2343
8
SHEET
1
OF
2
2
REV.
NANOPOWER BUCK-BOOST DC/DC WITH
INTEGRATED COULOMB COUNTER
TECHNOLOGY
IPEAK
5mA
10mA
15mA
25mA
50mA
100mA
150mA
250mA
TITLE: SCHEMATIC
IPK1 IPK0
R6
R4
R5
R4
R6
R3
R3
R5
R4
R6
R4
R5
R3
R6
R3
R5
IPEAK SELECTION
INSTALL
12
10
8
6
4
J3
PRODUCTION
2
2
DESCRIPTION
REV
-
REVISION HISTORY
ECO
7
D
C
B
A
DEMO MANUAL DC2343A
Schematic Diagram
dc2343af
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.
1
2
3
4
C4
10uF
6.3V
20%
0603
R10
1.0
5% C4 only used in
non-isolated
case
C5
10uF
6.3V
20%
0603
VCCin
GND
D+
D-
ID
VBUS
5
3
2
4
1
12 11
10 9
8 7
6 5
4 3
2 1
A
A
TSW-106-07-L-T
B
DC2343A-1-ASSY1
J1
USB Micro B RECEPTACLE
1981568-1
Close
to
J1.1
GND
GND
GND
GND
GND
GND
11
10
9
8
7
6
OPT
R13
0
R14
0
250VAC
470pF
1808
OPT C9
LTM2884CY
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
**
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
D2+
D2-
VLO2
VCC2
VCC2
VCC2
VCC2
L3
L4
L6
L7
K1
K2
K3
K4
K5
K6
K7
K8
K9
K10
K11
L2
L1
L5
L11
L10
L9
L8
B
DC2343A-1-ASSY1 INSTALL OPTIONS:
- ON BOARD PROCESSOR OPERATION:
- JP5 ROW B CONNECTS TO JP5 ROW C
- DUST or OTHER PROCESSOR CONNECTION:
- JP5 ROW A CONNECTS TO JP5 ROW B
- DVCC CONNECTS TO I/O SUPPLY
- SIGNALS TO/FROM LTC3335 CONNECT TO JP5-CX
OPT
470pF
1808
250VAC
C10 OPT
OPT
R12
0
SPND-PWR
ON
VLO
D1+
D1-
VBUS
VCC
VCC
VCC
VCC
OPT
R11
0
INSTALL DC2343A-1-ASSY1 ONTO
JP5 ROWs A AND B
A6
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
A3
A4
A5
A2
A1
A7
A11
A10
A9
A8
U3
Isolation Bypass
Components: 2512 for
5mm clearance
B
R16
10k
5%
1
16
15
C8
0.47uF
16V
14
C6
0.1uF
1
3
5
J2
21
2
4
6
ICD INTERFACE
WURTH-62000621121
17
13
12
6
5
2
3
4
11
7
8
9
10
20
19
0603
5%
R17
10M
R22
R25
C
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5%
2.00k
R20
GN1
2
3
D
SCALE = NONE
BJS
NC
DN1
GP2
DN1
4
6
5
4
6
5
DATE:
N/A
SIZE
06 - 30 - 15
IC NO.
C12
1uF
25V
C11
1uF
25V
1B
100
0603
R19
100
0603
R18
6C
5C
4C
3C
2C
1C
VOUT
VBAT
IRQ
PGOOD
SDA
SCL
DVcc
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
6A
6B
5A
5B
4A
4B
3A
3B
2A
2B
1A
**
JP5
TSW-106-07-L-T
E
E
GUI INTERFACE
DEMO CIRCUIT 2343
SHEET
2
OF
2
2
REV.
NANOPOWER BUCK-BOOST DC/DC WITH
INTEGRATED COULOMB COUNTER
TECHNOLOGY
0603
49.9k
R23
0603
49.9k
R24
TITLE: SCHEMATIC
GN1
GP2
DP2 SP2
M2
Si1553CDL
0603
10k
R27
5%
2.00k
R21
GRN
LED
D2
DP2 SP2
M1
Si1553CDL
2
3
APPROVALS
0603
R28
28.7k
D
ORNG
LED
D1
10k
R26 0603
28.7k
0603
DNP
0603
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
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
NOTES: UNLESS OTHERWISE SPECIFIED
1. RESISTORS: OHMS, 0402, 1%, 1/16W
2. CAPACITORS: 0402, 10%, 50V
VCC
PIC16F1459-I/ML
RA3/MCLR/Vpp
Vss
RC7
RC6
RC5
RC4
RC3
RC2
RB7
RB6
RB5
RB4
RA4
RA5
RC0/ICSPDAT
RC1/ICSPCLK
EPAD
18
Vdd
RA0/D+/ICSPDAT2
RA1/D-/ICSPCLK2
VUSB3V3
U2
C7*
301 Ohms
0603
VCC
Figure 19. DC2343A Demo Circuit Schematic
R15
301
0603
VCC
C
SN1
1
SN1
1
A
1
2
3
4
DEMO MANUAL DC2343A
Schematic Diagram
dc2343af
21
DEMO MANUAL DC2343A
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
22 Linear Technology Corporation
dc2343af
LT 0915 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2015
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