Linear Technology DC2026A Quick setup guide

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DEMO MANUAL DC2026A
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.Thesoftwareisasimpleprogrammingenvironment
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-IntegratedCircuit(I2C)andSerialPeripheralInterface
(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,
considersupportingthembypurchasingotheritemsfrom:
http://store.arduino.cc
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.
The Linduino One adds several features to the standard
Arduino Uno board:
• A14-pinQuikEval™connectorprovidesadirectconnec-
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.
• 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
Figure 1. Linduino One Basic Connections
IN-CIRCUIT
PROGRAMMING
HEADER
ARDUINO SHIELD HEADERS
ARDUINO SHIELD HEADERS
QUIK-EVAL
COMPATIBLE
DEMO BOARD
14 CONDUCTOR
RIBBON CABLE
AUXILIARY
POWER
USB TO
COUMPUTER
7V TO 20V
+ –

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DEMO MANUAL DC2026A
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
interfacetotheboard,demonstratingthelibraryfunctions.
The Linduino One is also available as DC2107, which
includes a DC934 as an easy to use example daughter
board.DC934isthedemonstrationboardfortheLTC
®
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.
Software Installation
1) Download LTSketchbook.zip from http://www.linear.
com/designtools/linduino.php 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
boardto thePC duringinstallation. Oncethe 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 1.0.4 is used in this manual.) This is not an
installer; no installation is necessary. Extract the con-
tents of this file to a convenient location for programs,
suchas“C:\ProgramFiles”.The“Arduino.exe”fileisthe
actual program file; double-click to open the Arduino
IDE.

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DEMO MANUAL DC2026A
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 DC2026A
2) Under Tools menu, select Board →Arduino Uno
Quick start GuiDe
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).

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DEMO MANUAL DC2026A
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 DC2026A
Quick start GuiDe
Running with QuikEval
Linear Technology demo boards with the 14-pin QuikEval
connectorarenormallyusedinconjunctionwithaDC590B
interfaceboardandtheQuikEvalsoftwarepackagerunning
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 DC2026A
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 DC2026A
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 DC2026A
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 DC2026A
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,SPIandI2Cinterfaces, andanauxiliary I2Cinterface
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
compatiblewithstandardArduino“shield”add-onboards.
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.)
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 DC2026A
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
5V
LOW NOISE
J1
5V
7V
7V7.6V5V
V+ 5V GPIO SCL/SCK SDA/MOSI MISO CS GND EEVCC EESCL EEDA EEGND
PIN 9
PIN 8
PIN 12 PIN 10
PIN A5 PIN A4
PIN 12 PIN 10
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

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DEMO MANUAL DC2026A
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 2 C1, C7 CAP., X5R, 4.7µF, 16V 10% 0603 TDK, C1608X5R1C475K
2 3 C2, C8, 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, C1608X7R1C105K
5 1 C5 CAP., NPO, 15pF, 50V 10% 0603 AVX, 06035A150KAT2A
6 1 C6 CAP., X5R, 4.7µF, 25V 10% 0805 TDK, C2012X5R1E475K
7 1 C10 CAP., COG, 10pF, 25V 10% 0402 AVX, 04023A100KAT2A
8 1 C11 CAP., X5R, 22µF, 6.3V 20% 1206 TAIYO YUDEN, JMK316BJ226ML-T
9 1 C16 CAP., X7R, 2.2µF, 50V 10% 1206 MURATA, GRM31CR71H225KA88L
10 6 C19, C20, C21,
C22, C25, C28 CAP., X7R, 0.1µF, 16V 10% 0603 AVX, 0603YC104KAT2A
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 J1 HEADER, 2×7 DUAL ROW MOLEX 87831-1420
20 1 J2 CONNECTOR, POWER JACK, 2.1mm CUI INC., PJ-002AH
21 2 J3, J8 CONN., RECEPT., 0.100, 8 POSITION SULLINS, PPPC081LFBN-RC
22 1 J4 HEADER, 2mm × 3mm PIN, 0.100 SAMTEC, TSW-103-07-G-D
23 1 J5 CONNECTOR, USB TYPE B, RIGHT ANGLE PCB MOUNT FCI, 61729-0010BLF (6tbs × 44)
24 1 J6 CONN., RECEPT., 0.100, 10 POSITION SULLINS, PPPC101LFBN-RC
25 1 J7 CONN., RECEPT., 0.100, 6 POSITION SULLINS, PPPC061LFBN-RC
26 1 L1 INDUCTOR, 15µH, 1.3A, SMD COOPER/COILTRONICS, MPI4040R3-150-R
27 1 L2 INDUCTOR, SHIELDED POWER, 10µH, SMT COILCRAFT, XFL3010-103ME
28 1 Q1 TRANSISTOR, MOSFET, N-CH 60V,150mA, SOT-23 DIODES INC., VN10LF
29 1 R1 RES., CHIP, 64.9k, 1/10W, 1% 0603 VISHAY, CRCW060364K9FKEA
30 1 R2 RES., CHIP, 47.5k, 1/10W, 1% 0603 VISHAY, CRCW060347K5FKEA
31 1 R3 RES., CHIP, 215k, 1/10W, 1% 0603 VISHAY, CRCW0603215KFKEA
32 1 R4 RES., CHIP, 13.7k, 1/10W, 1% 0603 VISHAY, CRCW060313K7FKEA
33 1 R5 RES., CHIP, 42.2k, 1/10W, 1% 0603 VISHAY, CRCW060342K2FKEA
34 5 R6, R7, R8, R9, R10 RES., CHIP, 4.99k, 1/10W, 1% 0603 VISHAY, CRCW06034K99FKEA
35 0 R11, R17, R19, R32 RES., CHIP, OPT, 0805 OPTIONAL
36 8 R12, R13, R15, R20,
R21, R22, R23, R24 RES., CHIP, 1k, 1/10W, 1% 0603 VISHAY, CRCW06031K00FKEA
37 1 R14 RES., CHIP, 1M, 1/16W, 1% 0402 VISHAY, CRCW04021M00FKED
38 1 R16 RES., CHIP, 1M, 1/10W, 1% 0603 VISHAY, CRCW06031M00FKEA
39 1 R18 RES., CHIP, 10k, 1/10W, 1% 0603 VISHAY, CRCW060310K0FKEA
40 0 R25 RES., CHIP, OPT, 0603 OPTIONAL
parts list

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DEMO MANUAL DC2026A
parts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
41 1 R26 RES., CHIP, 0.20Ω, 1/4W, 5% 0805 PANASONIC, ERJ-S6SJR20V
42 1 R27 RES., CHIP, 107k, 1/16W, 1% 0402 VISHAY, CRCW0402107KFKED
43 1 R28 RES., CHIP, 475k, 1/16W, 1% 0402 VISHAY, CRCW0402475KFKED
44 1 R29 RES., CHIP, 215k, 1/16W, 1% 0402 VISHAY, CRCW0402215KFKED
45 1 R30 RES., CHIP, 316k, 1/16W, 1% 0402 VISHAY, CRCW0402316KFKED
46 1 R31 RES., CHIP, 100Ω, 1/16W, 5% 0603 VISHAY, CRCW0603100RJKEA
47 1 S1 SWITCH, PUSHBUTTON, MINIATURE WÜRTH, 434 111 025 826
48 1 U1 MODULE, USB TRANSCEIVER, BGA-44 LINEAR TECH., LTM2884CY#PBF
49 1 U2 IC, DC/DC CONVERTER, TSOT-23 LINEAR TECH., LT3461ES6#PBF
50 1 U3 IC, LDO MICROPOWER REGULATOR, 5V, TSOT-23 LINEAR TECH., LT1761ES5-5#PBF
51 1 U4 IC, ANALOG SWITCH, 10-MSOP FAIRCHILD, FSA2257MUX
52 1 U5 IC, LDO MICROPOWER REGULATOR, 3.3V, TSOT-23 LINEAR TECH., LT1761ES5-3.3#PBF
53 1 U6 IC, IDEAL DIODE, LOW LOSS,TSOT-23 LINEAR TECH., LTC4411ES5#TRMPBF
54 1 U7 IC, MICROCONTROLLER ATMEL, ATMEGA328P-AU
55 1 U8 IC, LDO MICROPOWER REGULATOR, ADJUSTABLE,
TSOT-23 LINEAR TECH., LT1761ES5-BYP#TRMPBF
56 1 U9 IC, USB UART, 28-SSOP FTDI, FT232RL-REEL
57 1 U10 IC, STEP-DOWN REGULATOR, MS10 LINEAR TECH., LT3973EMSE#PBF
58 1 Y1 RESONATOR, 16MHz, SMT MURATA, CSTCE16M0V53-R0

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DEMO MANUAL DC2026A
schematic DiaGram
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
01/07/2013
LINEAR TECHNOLOGY ISOLATED
LTM2884
ANALOG IN
NORM
ICSP
01/07/2013
NOTE: ALL RESISTORS AND CAPACITORS ARE
SIZE 0603 UNLESS OTHERWISE SPECIFIED.
ARDUINO-COMPATIBLE DEMONSTRATION BOARD
M.HAWKINS
D.EDDLEMAN
OPT
FROM U1
DIGITAL(PWM~)
POWER
SCK
FROM J2, PAGE 2
TXRXON
IO
PAGE 2
MUX SEL
RESET
TRACE ON BOTTOM SIDE
LINDUINO ONE:
A0 A1 A2 A3
7
~6 ~5
4
~3
2
AREF
RX_0 TX_1
12
8
~9
RESET
SCL
SDA
AREF
GND
13
12
~11
~10
~9
8
7
~6
~5
4
~3
2
TX_1
RX_0
SCL SDA
~10
A5
A4
A3
A2
A1
A0
GND
RESET
13
SCK/SCL
MOSI/SDA
A5 A4
~11
13
+5V
+5V
+5V
+5V
+5V
5V_LOW_NOISE
7V
5V_LOW_NOISE
+5V
+5V
3V3
+5V
+5V
+5V
DISO-
DISO+
VIN
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
D.EDDLEMANPRODUCTION
2
-
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
D.EDDLEMANPRODUCTION
2
-
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
D.EDDLEMANPRODUCTION
2
-
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
DEMO CIRCUIT 2026A
12
N/A SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
DEMO CIRCUIT 2026A
12
N/A SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
DEMO CIRCUIT 2026A
12
N/A
R31 100R31 100
U7
ATMEGA328P-AU
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
C21
0.1uF
16V C21
0.1uF
16V
D5
YELLOW
D5
YELLOW
21
R8
4.99K
R8
4.99K
R6
4.99K
R6
4.99K
C20
0.1uF
16V
C20
0.1uF
16V
C25 0.1uFC25 0.1uF
C28
0.1uF
16V C28
0.1uF
16V
D4
YELLOW
D4
YELLOW
21
R16
1 MEG
R16
1 MEG
D1
YELLOW
D1
YELLOW
21
R18
10K
R18
10K
C23
1.0uF
16V C23
1.0uF
16V
R12
1K
R12
1K
J1J1
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 C19
0.1uF
16V
JP2JP2
2
3
1
Y1
16 Mhz
Y1
16 Mhz
13
2
U9
FT232RL
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
R23 1KR23 1K
R21
1K
R21
1K
J7J7
1
2
3
4
5
6
J6J6
1
2
3
4
5
6
7
8
9
10
U4 FSA2257MUX U4 FSA2257MUX
1B1
6
2A 9
2S
2
1B0
5
2B1
1
2B0
10
GND
8VCC 3
1S
7
1A 4
R10
4.99K
R10
4.99K
J4J4
1 3 5 6
4 2
D2
GREEN
D2
GREEN
21
R22
1K
R22
1K
R25
OPT
R25
OPT
R24 1KR24 1K
TP4TP4
1
R13
1K
R13
1K
R15 1KR15 1K
TP3TP3
1
R20
1K
R20
1K
R7
4.99K
R7
4.99K
J8J8
1
2
3
4
5
6
7
8
C18
1.0uF
16V C18
1.0uF
16V
J3J3
1
2
3
4
5
6
7
8
R9
4.99K
R9
4.99K
Q1 VN10LF Q1 VN10LF
1
2 3
C22
0.1uF
16V C22
0.1uF
16V
S1S1

15
dc2026afa
DEMO MANUAL DC2026A
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.
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
M.HAWKINS
D.EDDLEMAN
NOTE: ALL RESISTORS AND CAPACITORS ARE
SIZE 0603 UNLESS OTHERWISE SPECIFIED.
TO U9
PAGE 1
TO J3, PAGE 1
OPT
TRACE ON BOTTOM SIDE
LINEAR TECHNOLOGY ISOLATED
ARDUINO-COMPATIBLE DEMONSTRATION BOARD
LINDUINO ONE:
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
7.6V
USBD- USBD+ USBVCC USBGND
+5V
+5V
3V3
+5V
7V
5V_LOW_NOISE
+5V
DISO+ DISO-
VIN
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone] Milpitas, CA 95035 Phone: [phone] 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
2
DEMO CIRCUIT 2026A
22
N/A SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone] Milpitas, CA 95035 Phone: [phone] 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
2
DEMO CIRCUIT 2026A
22
N/A SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone] Milpitas, CA 95035 Phone: [phone] 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
2
DEMO CIRCUIT 2026A
22
N/A
TP1TP1
1
R14
1MEG
0402
R14
1MEG
0402
R28
475K
0402 R28
475K
0402
C15
10uF
16V
0805
C15
10uF
16V
0805
D3 B2100 D3 B2100
2 1
R4 13.7K R4 13.7K
R32
OPT
R32
OPT
R17 OPT
0805
R17 OPT
0805
R11 OPT
0805
R11 OPT
0805
U3
LT1761ES5-5
U3
LT1761ES5-5
GND
2
BYP 4
IN
1VOUT 5
SHDN
3
R3 215K R3 215K
J5J5
1 2 3 4 5 6
JP1JP1
21
C9 10uF 16V
0805
C9 10uF 16V
0805
C12
10uF
16V
0805
C12
10uF
16V
0805
+
C26
10uF
50V
SUNCON
+
C26
10uF
50V
SUNCON
R26
0.20 OHMS
0805
1/4W
R26
0.20 OHMS
0805
1/4W
C14
0.01uF
16V C14
0.01uF
16V
U6
LTC4411ES5
U6
LTC4411ES5
GND
2
STAT 4
IN
1VOUT 5
CTL
3
C24
0.047uF
16V C24
0.047uF
16V
C4
1.0uF
16V
C4
1.0uF
16V
C17
1.0uF
16V C17
1.0uF
16V
C27
0.22uF
0402 C27
0.22uF
0402
R5 42.2K R5 42.2K
C16
2.2uF
1206
50V
C16
2.2uF
1206
50V
C7
4.7uF
16V
C7
4.7uF
16V
R1 64.9K R1 64.9K
U8
LT1761ES5-BYP
U8
LT1761ES5-BYP
GND
2
BYP 3
IN
1VOUT 5
ADJ 4
U5
LT1761ES5-3.3
U5
LT1761ES5-3.3
GND
2
BYP 4
IN
1VOUT 5
SHDN
3
C11
22uF
1206 C11
22uF
1206
C10
10pF
COG 0402 C10
10pF
COG 0402
C8 0.01uF 16V C8 0.01uF 16V
C3 10uF 16V
0805
C3 10uF 16V
0805
R2 47.5K R2 47.5K
R30
316K
0402
R30
316K
0402
C2 0.01uF 16V C2 0.01uF 16V
C31
2.2nF
1kV
1206
C31
2.2nF
1kV
1206
J2J2
2 3 1
L2 10uHL2 10uH
1 2
R27
107K
0402 R27
107K
0402
TP2TP2
1
C6 4.7uF 25V
0805
C6 4.7uF 25V
0805
C30
2.2nF
1kV
1206
C30
2.2nF
1kV
1206
C13
1.0uF
16V C13
1.0uF
16V
R29
215K
0402
R29
215K
0402
L1
15uH
SMT L1
15uH
SMT
12
R19 OPT
0805
R19 OPT
0805
U10
LT3973EMS
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
C29
OPT
C29
OPT
U1
LTM2884CY
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
C5 15pF C5 15pF
C1 4.7uF 16V C1 4.7uF 16V
U2 LT3461ES6 U2 LT3461ES6
SW 1 GND
2
FB 3
VIN
6
SHDN
4
VOUT 5

16
dc2026afa
DEMO MANUAL DC2026A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2013
LT 0913 REV A • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC ) provides the enclosed product(s) under the following AS IS conditions:
Thisdemonstration board (DEMOBOARD) kit beingsold or providedby Linear Technology is intendedfor use forENGINEERING 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. 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