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DEMO MANUAL DC2026C
DESCRIPTION
Linduino One Isolated
Arduino-Compatible
Demonstration Board
Linear Technology’s DC2026 (called the Linduino
®
One) is
compatible with the Arduino Uno microcontroller board.
Arduino hardware consists of an Atmel microcontroller
with a bootloader allowing quick in-circuit firmware up-
dates. The software is a simple programming environment
based on the AVRGCC compiler. This platform is popular
because it is easy to use, both the hardware and software
are open source, and it can be programmed in C. We find
it an ideal way to demonstrate and distribute libraries for
integrated circuits that have digital interfaces such as
Inter-Integrated Circuit (I2C) and Serial Peripheral Interface
(SPI). While the Linduino One is Arduino-compatible, it
is not produced by the official Arduino team, and they do
not receive any monetary support from this board. Please,
consider supporting them by purchasing other items from:
http://store.arduino.cc
L, LT, LTC, LTM, Linear Technology, Linduino and the Linear logo are registered trademarks
and QuikEval are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
The Linduino One adds several features to the standard
Arduino Uno board:
• A 14-pin QuikEval™ connector provides a direct connec-
tion to a growing list of hundreds of Linear Technology
demo boards, including ADCs, DACs, Power System
Management, RF Synthesizers, System Monitor and
Control, and many others.
• Selectable 5V, 3.3V, 2.5V, 1.8V logic levels and analog
supply on QuikEval Connector
• An LTM
®
2884 provides galvanic isolation of USB data
and power for both safety and noise rejection.
• Auxiliary 7V to 20V power input on isolated side, with
conversion to 5V provided by an LT
®
3973 allowing high
power operation up to 750mA.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2026C
Figure 1. Linduino One Basic Connections
AUXILIARY
POWER
USB TO
COMPUTER
7V TO 20V
+ –
IN-CIRCUIT
PROGRAMMING
HEADER
J1 I/O VOLTAGE
SELECTION
ARDUINO SHIELD HEADERS
QUIK-EVAL
COMPATIBLE
DEMO BOARD
14 CONDUCTOR
RIBBON CABLE
ARDUINO SHIELD HEADERS
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DEMO MANUAL DC2026C
QUICK START GUIDE
The Linduino One comes preloaded with a DC590 emula-
tor program (called a “sketch”) that allows attached demo
boards to run with the standard QuikEval GUI software.
This allows the functionality of the board to be verified
before starting firmware development. After evaluation
with QuikEval, the Linduino One can be reprogrammed
with customer code. There is a top-level demonstration
sketch for each part’s library that provides a text terminal
interface to the board, demonstrating the library functions.
The Linduino One is also available as DC2026C-KIT, which
includes a DC934 as an easy to use example daughter
board. DC934 is the demonstration board for the LTC
®
2607
dual 16-bit, I2C digital to analog converter (DAC). This
board also has an LTC2422 2-channel, 20-bit, SPI inter-
face analog to digital converter (ADC) that reads back the
DAC output. Thus, this board demonstrates operation of
both SPI and I2C interfaces, and multichannel ADCs and
DACs. The following sections describe the procedure for
installing the required software and operating the DC934
with both QuikEval software and with a terminal based
demo program.
While this manual describes operation with the DC934,
the procedure applies to other boards as well.
Manual Software Installation
1) Download LTSketchbook.zip from www.linear.com/
docs/43958. This is the entire code base for the Linduino
board, including all demo code, libraries for individual
devices, auxiliary functions, and HTML documentation.
Extract this file to a location for working files, such as
your “My Documents” directory or “C:\Projects”.
2) Note: If QuikEval is already installed, please update to
the latest version by selecting Tools → Update Pro-
gram, then proceed to step 3. If not, download and run
QuikEval from www.linear.com/software. This installs
the QuikEval program, as well as the FTDI USB drivers
required for the Linduino One (and other Linear Tech-
nology interface boards.) Drivers are also distributed
with the Arduino IDE, but it is recommended to let
QuikEval install the drivers to ensure compatibility with
the Linduino One. You will be prompted to connect the
board to the PC during installation. Once the installation
is complete, quit QuikEval.
3) Download the Arduino Integrated Development Envi-
ronment (IDE) from either
http://arduino.cc/en/Main/Software or
http://www.linear.com/designtools/linduino.php
(Version 1.6.4 is used in this manual.) This is not an
installer; no installation is necessary. Extract the contents
of this file to a convenient location for programs, such as
“C:\Program Files”. The “Arduino.exe” file is the actual
program file; double-click to open the Arduino IDE.
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DEMO MANUAL DC2026C
QUICK START GUIDE
Arduino IDE Setup
1) From within the Arduino IDE, click on File → Preferences
Under Sketchbook Location: select Browse, and locate the path to the extracted LTSketchbook.zip file. The correct
location will show “LTSketchbook” in the Look In menu, and at least four subdirectories will be shown: Documenta-
tion, Libraries, Part Number and Utilities (more may be added in the future). Click Open, then click OK.
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DEMO MANUAL DC2026C
2) Under Tools menu, select Board → Arduino Uno
QUICK START GUIDE
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DEMO MANUAL DC2026C
3) Under the Tools menu, select Serial Port. There may be more than one option; the Linduino One is usually the
highest COM port number (COM12 is shown below).
QUICK START GUIDE
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DEMO MANUAL DC2026C
QUICK START GUIDE
4) Click on the Serial Monitor, which looks like a magnifying glass:
This will bring up the monitor window:
Select Newline terminator and set the baud rate to 115200. You should see a “hello” message – this indicates that
serial communication is set up properly, and that the DC590 emulator firmware is properly installed. Pressing the
RESET button on the Linduino One will cause the message to be sent again. If this message does not appear, try a
different COM port.
(Note: The DC590 emulator sketch can be restored by following the procedure detailed below for uploading the
DC934 sketch, substituting the DC590 sketch which is located in File → Sketchbook → Utilities → DC590B.)
5) Quit the Arduino IDE. Note that a restart is required every time the Sketchbook location is changed.
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DEMO MANUAL DC2026C
QUICK START GUIDE
Running with QuikEval
Linear Technology demo boards with the 14-pin QuikEval
connector are normally used in conjunction with a DC590B
interface board and the QuikEval software package running
on a PC. Designers can then use the software to evaluate
the performance of the product on the demo board. The
Linduino One comes programmed with firmware that al-
lows it to emulate the DC590B controller, so the QuikEval
software can be used to check basic functionality in a
target system.
Connect the DC934 to the Linduino One with the supplied
14-pin ribbon cable. Run QuikEval. The control panel for
the LTC2607 will appear, and clicking COLLECT will start
communication with the board. The onboard LTC2422
ADC reads back the output voltages, and the voltage may
be changed by entering a number in the appropriate box
or by moving the sliders.
Quit QuikEval after this step.
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DEMO MANUAL DC2026C
Running with the Linduino Demonstration Program
After the DC934 has been run with the user-friendly QuikEval GUI, a demonstration program can be loaded into the
Linduino One that demonstrates the library functions for the LTC2607 and LTC2422.
1) Open the Arduino IDE. Find the part number on the demo board, LTC2607 in this case. In the File menu select
Sketchbook → Part Number → 2000 → 2600 → 2607 → DC934A.
(There may be other entries for a particular part number showing example usage cases, experiments, etc. The entry
for the demo circuit number is the general-purpose demonstration program and is a good place to start.)
QUICK START GUIDE
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DEMO MANUAL DC2026C
A new window will appear with the sketch.
2) Upload the sketch by clicking the UPLOAD button:
When this process is completed, a message at the bottom should display a similar message as shown.
QUICK START GUIDE
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DEMO MANUAL DC2026C
QUICK START GUIDE
3) Open the Serial Monitor (magnifying glass icon) once more. The monitor will now display the program interface.
To use the program, enter commands into the text box, then click the Send button.
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DEMO MANUAL DC2026C
QUICK START GUIDE
Going Further
After completing the procedure in this Quick Start Guide,
all of the tools are in place to move on to other products
or further experimentation with the DC934. The main page
for all Linduino resources is:
http://www.linear.com/designtools/linduino.php
HTML documentation for the code is provided in the
sketchbook in the Documentation subdirectory.
External Connections
J1: QuikEval header – Connection to QuikEval demonstra-
tion board. This connector provides 5V at 50mA, 7.6V at
50mA, SPI and I2C interfaces, and an auxiliary I2C interface
for identification of the attached demonstration board.
J2: AC ADAPTOR IN – 2.1mm × 5.5mm barrel connector.
Optional DC power input, 7V to 20V DC. With external
power applied, up to 750mA can be drawn from the 5V
supply (available on pins 2 and 5 on J3, or pin 10 on J1.)
J3, J6, J7, J8: Arduino shield headers. These headers are
compatible with standard Arduino “shield” add-on boards.
Refer to schematic for individual signals.
J4: ICSP – In-circuit serial programming header. Used in
conjunction with an external programming tool such as
an AVR Dragon or JTAGICE3.
J5: USB – Connection to the host computer. Power for the
Linduino and the connected daughter board is also taken
from J5 if no external power is supplied to J2.
Jumpers
JP1: Factory use only.
JP2: Reset configuration, not installed. When the ICSP
header is used with an external tool, install a 3 position,
0.1" header in this location and cut the trace labeled NORM
on the back side of the board. Place jumper in the right-
hand position (opposite to NORM) to allow the ICSP tool
to control the RESET signal, install in the NORM position
to allow the FT232 DTR signal to control RESET (this is
normal Arduino operation, and required to program the
board from within the Arduino IDE.)
JP3: VCCIO selection 5V (default), 3.3V, 2.5V, remove for
1.8V, or EXT to disable the onboard regulator and supply
VCCIO to the DC2026 from the attached demo board.
Refer to the documentation for the attached demo board
for information on acceptable voltage levels.VCCIO is the
low-voltage supply for the attached demo board. It also
sets the logic level for the SPI and I2C signals.
LEDs
ON: Lights when 5V supply is on, from which all other
supply voltages are generated.
SCK: Lights when Arduino pin 13 (SCK on the SPI bus)
is high. This is the pin used in the “blink” sketch under
File → Examples → Basics → Blink.
RX: Lights when data is being received from the host
computer through the USB port.
TX: Lights when data is being sent to the host computer
through the USB port.
RESET Button (S1): Asserts the ATMega328’s RESET line,
restarting program execution.
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DEMO MANUAL DC2026C
BLOCK DIAGRAM
5V_USB
GND_USB
D+_USB
D–_USB
5V_ISO
GND_ISO
5V
USB
AC ADAPTER
7V TO 20V
MAX 200mA
PC
USB D+_ISO
D–_ISO
LTM2884
USB ISOLATOR
LTC4411
IDEAL DIODE
FTDI
USB-TO-SERIAL
5V
D+
D–TX
RX
DTR
LT3973
BUCK
MAX 750mA
IN OUT
LT1761
LDO
ATMEGA328P PINS A0-A5
PINS 2-13
PIN 13/SPI SCK
PIN A4/I2C SDA
PIN A5/I2C SCL
PIN 11/SPI MOSI
5V
PIN 0
PIN 1
RESET
SERIAL
I/O (FOR ADC)
I/O
LT3461
BOOST
MAX 750mA
IN OUT
IN OUT
3.3V LT1761
LDO
LT1761
LDO
IN OUT
IN OUT
5V
LOW NOISE
VCCIO
VCCIO
5V
J1
5V
7V
7V7.6V5V
V+
VCCIO
GPIO
SCL/SCK
SDA/MOSI
MISO
CS
GND
EEVCC
EESCL
EEDA
EEGND
PIN 8
PIN A5
PIN A4
PIN NAMES CORRESPOND TO ARDUINO PINS.
PIN 8 SWITCHES MUX BETWEEN MICROCONTROLLER I2C PORT (PINS A4, A5)
AND MICROCONTROLLER SPI PORT (PINS 11, 13)
DEMO BOARD EEPROM (EESCI, EESDA) IS ALWAYS CONNECTED TO
MICROCONTROLLER I2C PORT (PINS A4, A5)
DC2026 BD
VCC
SCLIN
SDAIN
EN
DISCEN
ACC
VCC2
SCLOUT
SDAOUT
READY
FAULT
TP3
TP4
PIN 8
PIN 8
PIN 12
PIN 9
+
–VCCIO/2
LT1719 PIN 10
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dc2026cfe
DEMO MANUAL DC2026C
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 2 C1, C7 CAP., X5R, 4.7μF, 16V, 10%, 0603 TDK, C1608X5R1C475K080AC
2 2 C2, C14 CAP., X7R, 0.01μF, 16V, 10%, 0603 AVX, 0603YC103KAT2A
3 4 C3, C9, C12, C15 CAP., X5R, 10μF, 16V, 10%, 0805 MURATA, GRM21BR61C106KE15L
4 5 C4, C13, C17, C18, C23 CAP., X7R, 1μF, 16V, 10%, 0603 TDK, C1608X7R1C105K080AC
5 1 C5 CAP., NPO, 15pF, 50V, 10%, 0603 AVX, 06035A150KAT2A
6 1 C6 CAP., X5R, 4.7μF, 25V, 10%, 0805 TDK, C2012X5R1E475K125AB
7 10 C8, C19-C22, C25, C28, C32-C34 CAP., X7R, 0.1μF, 16V, 10%, 0603 AVX, 0603YC104KAT2A
8 1 C10 CAP., COG, 10pF, 25V, 10%, 0402 AVX, 04023A100KAT2A
9 1 C11 CAP., X5R, 22μF, 6.3V, 20%, 1206 TAIYO YUDEN, JMK316ABJ226MLHT
10 1 C16 CAP., X7R, 2.2μF, 50V, 10%, 1206 MURATA, GRM31CR71H225KA88L
11 1 C24 CAP., X7R, 0.047μF, 16V, 10%, 0603 AVX, 0603YC473KAT2A
12 1 C26 CAP., ALUM., 10μF, 50V, 10%, SMT SUN ELECT., 50CE10BSS
13 1 C27 CAP., X5R, 0.22μF, 10V, 20%, 0402 AVX, 0402ZD224MAT2A
14 0 C29 CAP., OPT, 0805 OPTION
15 2 C30, C31 CAP., X7R, 2.2nF, 1kV, 10%, 1206 AVX, 1206AC222KAT1A
16 3 D1, D4, D5 LED,YELLOW, DIFFUSED, 0805 AVAGO, HSMY-C170
17 1 D2 LED, GREEN, DIFFUSED, 0805 AVAGO, HSMG-C170
18 1 D3 DIODE, SCHOTTKY, 100V, 2A, SMB DIODES INC., B2100-13-F
19 1 JP3 HEADER, 2×4 PIN, 0.079CC SULLINS, NRPN042PAEN-RC
20 1 J1 HEADER, 2×7 DUAL ROW MOLEX, 87831-1420
21 1 J2 CONNECTOR, POWER JACK, 2.1mm CUI INC., PJ-002AH
22 2 J3, J8 CONN., RECEPT., 0.100, 8 POSITION SULLINS, PPPC081LFBN-RC
23 1 J4 HEADER, 2×3 PIN, 0.100 SAMTEC, TSW-103-07-L-D
24 1 J5 CONNECTOR, USB TYPE B, RIGHT ANGLE PCB MOUNT FCI, 61729-0010BLF
25 1 J6 CONN., RECEPT., 0.100, 10 POSITION SULLINS, PPPC101LFBN-RC
26 1 J7 CONN., RECEPT., 0.100, 6 POSITION SULLINS, PPPC061LFBN-RC
27 1 L1 INDUCTOR, 15μH, 1.3A, SMD COOPER MPI4040R3-150-R
28 1 L2 INDUCTOR, SHIELDED POWER, 10μH, SMT COILCRAFT, XFL3010-103ME
29 4 MP1-MP4 BUMPER, ADHESIVE-BACKED 3M, SJ5376
30 1 Q1 TRANSISTOR, MOSFET, N-CH 60V,150mA, SOT-23 DIODES INC., VN10LFTA
31 1 R1 RES., CHIP, 64.9k, 1/10W, 1% 0603 VISHAY, CRCW060364K9FKEA
32 1 R2 RES., CHIP, 47.5k, 1/10W, 1% 0603 VISHAY, CRCW060347K5FKEA
33 1 R3 RES., CHIP, 215k, 1/10W, 1% 0603 VISHAY, CRCW0603215KFKEA
34 1 R4 RES., CHIP, 13.7k, 1/10W, 1% 0603 VISHAY, CRCW060313K7FKEA
35 1 R5 RES., CHIP, 42.2k, 1/10W, 1% 0603 VISHAY, CRCW060342K2FKEA
36 4 R6, R7, R9, R10 RES., CHIP, 4.99k, 1/10W, 1% 0603 VISHAY, CRCW06034K99FKEA
37 6 R8, R25, R48, R52, R53, R54 RES., CHIP, 49.9k, 1/10W, 1% 0603 VISHAY, CRCW060349K9FKEA
38 0 R11, R32 RES., CHIP, OPT, 0805 OPTION
39 14 R12, R13, R15, R17, R20, R21,
R22, R23, R24, R35, R36, R42,
R44, R46
RES., CHIP, 1k, 1/10W, 1% 0603 VISHAY, CRCW06031K00FKEA
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DEMO MANUAL DC2026C
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
40 1 R14 RES., CHIP, 1MEG, 1/16W, 1%, 0402 VISHAY, CRCW04021M00FKED
41 1 R16 RES., CHIP, 1MEG, 1/10W, 1%, 0603 VISHAY, CRCW06031M00FKEA
42 5 R18, R40, R41, R45, R47 RES., CHIP, 10k, 1/10W, 1%, 0603 VISHAY, CRCW060310K0FKEA
43 1 R19 RES., CHIP, 86.6k, 1/10W, 1%, 0603 NIC, NRC06F8662TRF
44 5 R25, R48, R52, R53, R54 RES., CHIP, 49.9k, 1/10W, 1%, 0603 VISHAY, CRCW060349K9FKEA,
NIC, NRC06F4992TRF
45 1 R26 RES., CHIP, 0.20Ω, 1/4W, 5%, 0805 PANASONIC, ERJ-S6SJR20V
46 1 R27 RES., CHIP, 107k, 1/16W, 1%, 0402 VISHAY, CRCW0402107KFKED
47 1 R28 RES., CHIP, 475k, 1/16W, 1%, 0402 VISHAY, CRCW0402475KFKED
48 1 R29 RES., CHIP, 215k, 1/16W, 1%, 0402 VISHAY, CRCW0402215KFKED
49 1 R30 RES., CHIP, 316k, 1/16W, 1%, 0402 VISHAY, CRCW0402316KFKED
50 1 R31 RES., CHIP, 100Ω, 1/10W, 5%, 0603 VISHAY, CRCW0603100RJNEA
51 0 R33, R34, R37, R38, R43 RES., CHIP, OPT, 0603 OPTION
52 1 R39 RES., CHIP, 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA
53 1 R49 RES., CHIP, 105k, 1/10W, 1%, 0603 VISHAY, CRCW0603105KFKEA
54 1 R50 RES., CHIP, 19.1k, 1/10W, 1%, 0603 VISHAY, CRCW060319K1FKEA
55 1 R51 RES., CHIP, 40.2k, 1/10W, 1%, 0603 VISHAY, CRCW060340K2FKEA
56 2 R55, R56 RES., 49.9Ω, 1/10W, 1%, 0603 NIC, NRC06F49R9TRF
57 1 R57 RES., 24.9Ω, 1/10W, 1%, 0603 NIC, NRC06F24R9TRF
58 1 S1 SWITCH, PUSHBUTTON, MINIATURE WÜRTH ELEKTRONIK, 434111025826
59 1 U1 MODULE, USB TRANSCEIVER, BGA-44 LINEAR TECH., LTM2884CY#PBF
60 1 U2 IC, DC-DC CONVERTER, TSOT-23 LINEAR TECH., LT3461ES6#PBF
61 1 U3 IC, LDO MICROPOWER REGULATOR, ADJUSTABLE, TSOT-23 LINEAR TECH., LT1761ES5-SD#PBF
62 1 U4 IC, BUS BUFFER, 2-WIRE, MSOP LINEAR TECH., LTC4315CMS#PBF
63 1 U5 IC, LDO MICROPOWER REGULATOR, 3.3V, TSOT-23 LINEAR TECH., LT1761ES5-3.3#PBF
64 1 U6 IC, IDEAL DIODE, LOW LOSS,TSOT-23 LINEAR TECH., LTC4411ES5#PBF
65 1 U7 IC, MICROCONTROLLER ATMEL, ATMEGA328P-AU
66 1 U8 IC, LDO MICROPOWER REGULATOR, ADJUSTABLE, TSOT-23 LINEAR TECH., LT1761ES5-BYP#PBF
67 1 U9 IC, USB UART, 28-SSOP FTDI, FT232RL-REEL
68 1 U10 IC, STEP-DOWN REGULATOR, MS10 LINEAR TECH., LT3973EMSE#PBF
69 1 U11 IC., SINGLE/DUAL-SUPPLY COMPARATOR LINEAR TECH., LT1719CS6#PBF
70 2 U12, U13 IC, TRI-STATE UHS BUFFER, US8 FAIRCHILD, NC7WZ125K8X
71 1 XJP3 SHUNT, 2mm SAMTEC, 2SN-BK-G
72 1 Y1 RESONATOR, 16MHz, SMT MURATA, CSTCE16M0V53-R0
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dc2026cfe
DEMO MANUAL DC2026C
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
LTM2884
ANALOG IN
NORM
ICSP
NOTE: ALL RESISTORS AND CAPACITORS ARE
SIZE 0603 UNLESS OTHERWISE SPECIFIED.
M.HAWKINS
MARK THOREN
OPT
FROM U1
DIGITAL(PWM~)
POWER
SCK
FROM J2, PAGE 2
TXRXON
IO
PAGE 2
MUX
RESET
TRACE ON BOTTOM SIDE
MUX
LINEAR TECHNOLOGY ISOLATED
ARDUINO-COMPATIBLE DEMONSTRATION BOARD
LINDUINO ONE:
05/29/2015
-PRODUCTION RELEASE DC2026B: M.THOREN 4/03/2014
01 SKU UPDATE TO DC2026C: ADDED R52-R57
A0
A1
A2
A3
7
~6
~5
4
~3
2
AREF
~11
~9
RX_0
RESET
TX_1
SCL
SDA
AREF
GND
13
12
~11
~10
~9
8
7
~6
~5
4
~3
2
TX_1
RX_0
SCL
SDA
A3
A2
A1
A0
GND
RESET
13
13
SCK/SCL MOSI/SDA
GPIOCS
SCL
SDA
~10
12
8
+5V
+5V
+5V
+5V
VCCIO
7V
+5V
+5V
3V3
+5V
+5V
+5V
VCCIO
VCCIO
+5V
VCCIO
+5V
+5V
VCCIO
VCCIO
+5V
VCCIO
VCCIO
VCCIO
DISO-
DISO+
VIN
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 2026C
12
N/A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 2026C
12
N/A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 2026C
12
N/A
REVISION HISTORY
DESCRIPTIONREV
REVISION HISTORY
DESCRIPTIONREV
REVISION HISTORY
DESCRIPTIONREV
R31 100
U7
ATMEGA328P-AU
PC6 (RESET)
29
PB6(XTAL1/TOSC1)
7
AREF
20
GND
5GND
3
AVCC
18
GND
21
PB7(XTAL2/TOSC2)
8
VCC
4
VCC
6
ADC7
22
ADC6
19 PDO(RXD) 30
PD1(TXD) 31
PD2(INT0) 32
PD3(INT1) 1
PD4(XCK/T0) 2
PD5(T1) 9
PD6(AIN0) 10
PD7(AIN1) 11
PC0(ADC0) 23
PC1(ADC1) 24
PC2(ADC2) 25
PC3(ADC3) 26
PC4(ADC4/SDA) 27
PC5(ADC5/SCL) 28
PB0(ICP1) 12
PB1(OC1A) 13
PB2(SS/OC1B) 14
PB3(MOSI/OC2A) 15
PB4(MISO) 16
PB5(SCK) 17
R42
1K
C21
0.1uF
16V
R55 49.9
R41
10K
U12-1
NC7WZ125K8X
6
84
2
1
D5
YELLOW
21
C33
0.1uF
R25
49.9K
R10
4.99K
R6
4.99K
C20
0.1uF
16V
R9
4.99K
S1
R45
10K
C28
0.1uF
16V
D4
YELLOW
21
R44 1K
R16
1 MEG
D1
YELLOW
21
U13-2
3
84
5
7
R18
10K
C23
1.0uF
16V
R35 1K
C34
0.1uF
R37
OPT
R12
1K
JP2
1
3
2
J1
V+
1
GND
3
MISO
5
MOSI/SDA
7
EESDA
9EESCL
11
GND
13
5V
2
SCK/SCL
4
CS
6
GND
8
EEVCC
10
EEGND
12
GPIO
14
C19
0.1uF
16V
C32
0.1uF
R34
OPT
Y1
16 Mhz
13
2
R17 1K
R8
49.9K
+
-
U11
LT1719CS6
3
1
5
4
2
6
U9
FT232RL
TXD 1
RXD 5
RTS# 3
CTS# 11
DTR# 2
DSR# 9
DCD# 10
RI# 6
CBUS0 23
CBUS1 22
CBUS2 13
CBUS3 14
CBUS4 12
TEST
26
GND
21
GND
18
GND
7
AGND
25
VCCIO
4
VCC
20
USBDM
16
USBDP
15
NC
8
RESET#
19
NC
24
OSCI
27
OSCO
28
3V3OUT
17
R36
1K
R33
OPT
R23 1K
R39 0 OHM
U13-1
NC7WZ125K8X
6
84
2
1
R21
1K
J7
1
2
3
4
5
6
J6
1
2
3
4
5
6
7
8
9
10
R38 OPT
J4
1
3
5 6
4
2
D2
GREEN
21
R46 1K
U12-2
3
84
5
7
R22
1K
R24 1K
TP4
1
R13
1K
C8
0.1uF
R56 49.9
U4
LTC4315CMS
EN
1
GND
6
READY 7
DISCEN
2
SCLOUT 3
ACC
5
SCLIN
4
FAULT 8
SDAIN
9SDAOUT 10
VCC2 11
VCC
12
R15
1K
TP3
1
R20
1K
R7
4.99K
R53
49.9K
R54
49.9K
C25
0.1uF
J8
1
2
3
4
5
6
7
8
C18
1.0uF
16V
R52
49.9K
J3
1
2
3
4
5
6
7
8
R57
24.9
R40
10K
Q1
VN10LF
1
2 3
R43
OPT
C22
0.1uF
16V
16
dc2026cfe
DEMO MANUAL DC2026C
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
3.3V
AC ADAPTOR IN
USB GND
USB
USB GND
NOTE: ALL RESISTORS AND CAPACITORS ARE
SIZE 0603 UNLESS OTHERWISE SPECIFIED.
TO U9
PAGE 1
TO J3, PAGE 1
OPT
TRACE ON BOTTOM SIDE
USB GND
USB GND
OUTPUT 7.6V @ 100mA
3.3V OUTPUT 50mA MAX
AC ADAPTOR 5V OUTPUT 750mA MAX
USB 5V OUTPUT 200mA MAX
7V-20V INPUT
5V
3.3V
2.5V
EXT
PCB MECHANICAL PARTS
M.HAWKINS
MARK THOREN
05/29/2015
LINEAR TECHNOLOGY ISOLATED
ARDUINO-COMPATIBLE DEMONSTRATION BOARD
LINDUINO ONE:
LTM2884
7.6V
USBD-
USBD+
USBVCC
USBGND
+5V
+5V
3V3
+5V
7V
+5V
VCCIO
DISO+
DISO-
VIN
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 2026C
22
N/A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 2026C
22
N/A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 2026C
22
N/A
MP1
BUMPER, ADHESIVE-BACKED
R14
1MEG
0402
TP1
1
D3
B2100
2 1
C15
10uF
16V
0805
R28
475K
0402
MP4
BUMPER, ADHESIVE-BACKED
R11 OPT
0805
R32
OPT
R4
13.7K
C9
10uF
16V
0805
R47
10K
J5
1
2
3
4
5
6
R3
215K
U6
LTC4411ES5
GND
2
STAT 4
IN
1VOUT 5
CTL
3
C14
0.01uF
16V
R26
0.20 OHMS
0805
1/4W
+
C26
10uF
50V
SUNCON
C12
10uF
16V
0805
C4
1.0uF
16V
C24
0.047uF
16V
C17
1.0uF
16V
MP2
BUMPER, ADHESIVE-BACKED
C7
4.7uF
16V
C16
2.2uF
1206
50V
R5
42.2K
C27
0.22uF
0402
R50
19.1K
U8
LT1761ES5-BYP
GND
2
BYP 3
IN
1VOUT 5
ADJ 4
R1
64.9K
C10
10pF
COG
0402
C11
22uF
1206
U3
LT1761ES5-SD
GND
2
SHDN
3
IN
1VOUT 5
ADJ 4
U5
LT1761ES5-3.3
GND
2
BYP 4
IN
1VOUT 5
SHDN
3
JP3
1
3
5 6
4
2
7 8
C31
2.2nF
1kV
1206
C2
0.01uF
16V
R30
316K
0402
R2
47.5K
C3
10uF
16V
0805
L2 10uH
1 2
J2
2
3
1
MP3
BUMPER, ADHESIVE-BACKED
TP2
1
R27
107K
0402
R48
49.9K
C30
2.2nF
1kV
1206
C6
4.7uF
25V
0805
L1
15uH
SMT
12
R51
40.2K
R29
215K
0402
C13
1.0uF
16V
C29
OPT
U10
LT3973EMS
PG
9
RT 10
BOOST 7
EN/UVLO
3
OUT
2
GND
11
GND
5
VIN
4
FB 1
BD 8
SW 6
U2
LT3461ES6
SW 1
GND
2
FB 3
VIN
6
SHDN
4
VOUT 5
R49
105K
C1
4.7uF
16V
R19
86.6K
JP1
1 2
C5
15pF
U1
LTM2884CY
D1+
A2
D1-
A1
SPND-PWR
A3
ON
A4
VLO
A5
GND
B1
GND
B2
GND
B3
GND
B4
GND
B5
GND
B6
GND
B7
GND
B8
GND
B9
GND
B10
GND
B11
GND2 K1
GND2 K2
GND2 K3
GND2 K4
GND2 K5
GND2 K6
GND2 K7
GND2 K8
GND2 K9
GND2 K10
GND2 K11
GND2 L3
GND2 L4
GND2 L6
GND2 L7
GND
A6
VBUS
A7
VCC
A8 VCC
A9 VCC
A10 VCC
A11
D2- L1
D2+ L2
VLO2 L5
VCC2 L8
VCC2 L9
VCC2 L10
VCC2 L11
17
dc2026cfe
DEMO MANUAL DC2026C
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
REVISION HISTORY
BOARD REV DATE DESCRIPTION PAGE NUMBER
B 08/14 Added circuitry to allow adjustment of VCCIO voltage and SPI/I2C logic levels 11, 12
C 06/15 Revised Board to C, added pull-up resistors to U12, U13 inputs. Added source termination resistors to U1,
U13 outputs. 13, 14, 15
C 03/16 Update text, screenshots to show Arduino 1.6.4 2, 4, 5, 8, 9
(Revision history begins at Rev C of Manual)
18
dc2026cfe
DEMO MANUAL DC2026C
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2013
LT 0316 REV E • PRINTED IN USA
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 LT C 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. LT C 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 applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
