Linear Technology DC2026A Guida rapida alla configurazione

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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

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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