Linear Technology DC2026 Quick setup guide

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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.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, 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:
• 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.
• 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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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.
TheLinduino Oneis alsoavailable asDC2026C-KIT, 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.
Manual Software Installation
1) Download LTSketchbook.zip from www.linear.com/
docs/43958.ThisistheentirecodebasefortheLinduino
board, including all demo code, libraries for individual
devices,auxiliaryfunctions, andHTMLdocumentation.
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 thePCduring installation.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 1.6.4 is used in this manual.) This is not an
installer;noinstallationisnecessary.Extractthecontents
ofthisfiletoaconvenientlocationforprograms,suchas
“C:\Program Files”. The “Arduino.exe” file is the actual
program file; double-click to open the Arduino IDE.
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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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2) Under Tools menu, select Board →Arduino Uno
QUICK START GUIDE
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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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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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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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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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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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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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