Linear Technology DC1427A Manuale utente

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1427A

I2C/SMBUS/PMBUS CONTROLLER

DESCRIPTION

Demonstration circuit 1427A is a USB-based con-

troller with generic Inter Integrated Circuit (I

C )

ports. It is designed to mate with Linear Technol-

ogy’s family of LT Powerplay demonstration

boards. The demo board is fully isolated from the

host PC’s ground. The evaluation software auto-

matically detects which demo board is connected

and loads the appropriate control screen.

The LT Powerplay system provides a quick and

easy way to evaluate the performance of a wide

variety of Linear Technology’s products.

LT Powerplay is a trademark of Linear Technology Corporation; I

C is a

trademark of Philips Electronics N.V.; Ado e is a trademark of Ado e Sys-

tems, Inc.

Figure

FigureFigure

Figure

1.1.

Basic Connection

Basic ConnectionBasic Connection

Basic Connections

Demo Circuit

Under Evaluation

USB Ca le

To Host PC

ISOLATED

GROUND

Connect 2.7 to

5V Logic supply ONLY IF

VCCIO is set to EXT. See Text.

Connect external 10-12V sup

ply ONLY

IF JP5, ISO is set to OFF. See Text.

Do Not Connect

Isolated Power Supply

(Shown in OFF position)

Select Isolated Supply Volt-

age (2.7V, 3.3V, 5.0V, or

External. Normally, 3.3 V

Do Not Connect

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1427A

I2C/SMBUS/PMBUS CONTROLLER

QUICK START PROCEDURE

For proper equipment setup, follow the procedure

below:

1.1.

Do NOT plug in DC1427A before running the

installation program.

2.2.

Download the LT Powerplay installation pro-

gram from

http://www.linear.com/software/.

3.3.

Run the LT Powerplay installation program and

follow the on-screen instructions.

NOTE:

NOTE:NOTE:

NOTE:

The LT Powerplay demo software requires

a PC that is running Windows XP (or later), and

has an available USB port.

4.4.

Connect the demonstration circuit to be evalu-

ated to DCDC1427A using the supplied 14-

conductor ribbon cable. The demo software de-

tects the circuit and starts the appropriate con-

trol screen.

Each demonstration board also comes with a

Quick Start guide similar to this one. For usage

details relevant to a particular circuit refer to its

Quick Start Guide. Additional information and

documentation is available in the help menu.

SOFTWARE TOOLS

SOFTWARE TOOLS SOFTWARE TOOLS

SOFTWARE TOOLS

The LT Powerplay Demo software includes tools

for automatic software updates and for quickly re-

trieving relevant documentation from the World

Wide Web.

NOTE:

NOTE:NOTE:

NOTE:

Adobe Acrobat reader is required to view

the documents and is available at

http://www.adobe.com.

To use the tools:

To use the tools:To use the tools:

To use the tools:



•

Quit the demonstration circuit software or dis-

connect the USB cable so that The main control

panel appears:

To To

To u

update the software

pdate the softwarepdate the software

pdate the software (requ

(requ (requ

(requires internet

ires internet ires internet

ires internet

connection)

connection)connection)

connection):



•

••

•

Choose Update from the Tools menu.

This automatically updates the main program

and drivers for individual demo circuits.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1427A

I2C/SMBUS/PMBUS CONTROLLER

CONNECTIONS TO THE DC1427A

Figure 1 shows the connections to the DC1427A.

Refer to the Controlled demo circuit's Quick Start

Guide for additional required connections.

Isolated Suppl O

Isolated Suppl OIsolated Suppl O

Isolated Suppl Options

ptionsptions

ptions

An LT3439 low-noise switching power supply pro-

vides isolated power to the demonstration circuit

under evaluation and to the isolation circuitry. This

is adequate in many cases, however an external

power supply can be used to reduce the load on

the host computer’s USB port or to reduce power

supply noise in the circuit under test.

The LT3439 switching power supply is enabled by

default but may be disabled by moving jumper

JP5 (ISO, to the left) to the OFF position. This al-

lows the isolated side of the board and the dem-

onstration circuit under evaluation to be powered

separately. This is recommended when testing

precision components such as high resolution

ADCs and DACs. After moving JP5 ISO to the

OFF position, apply a clean, regulated power sup-

ply from 7v to 10V to the V+ and AGND turret

posts.

Isolated Digital Suppl

Isolated Digital SupplIsolated Digital Suppl

Isolated Digital Suppl

The signal levels on the digital interface are de-

termined by the VCCA voltage. The onboard regu-

lator can be set to 5V, 3.3V, 2.7V by installing JP6

in the appropriate position (remove jumper for

2.7V.) Selecting EXT shuts the regulator down,

and an external supply between 2.7 and 5V must

be applied to the VCCA turret post.

The +5V turret is the digital supply for the isolated

portion of DC1427A. Do not draw current from this

point

LED Indicators

LED IndicatorsLED Indicators

LED Indicators

Two LED indicators are provided. The “ISO PWR”

LED is lit when either the onboard switching

power supply is running or external power is ap-

plied to the isolated side of the board.

The “COMMAND” LED indicates that a command

has been sent to the board by the host PC and is

waiting to be executed. The LED may not appear

to be blinking in some cases, as the duty cycle

may be very short.

Jumper

umper umper

umper S

Summar

ummarummar

ummar

Some jumpers on the DC1427 board are for future

use and MUST be left in the default positions.

JP1 – PROG – Microcontroller in-circuit program-

ming header, do NOT install jumper, make no

connections.

JP2 – MODE – do NOT install jumper, make no

connections.

JP3 – Watchdog enable - do NOT install jumper,

make no connections.

JP4 – EE – Jumper MUST be in the EN position.

JP5 – SW (right-hand side) MUST be in the ON

position. ISO (left-hand side) controls the isolated

supply. See Connections section.

JP6 – VCCA control. See Connections section.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1427A

I2C/SMBUS/PMBUS CONTROLLER

TROUBLESHOOTING GUIDE

DC1427A is plugged in, but LT Powerplay screen still says “USB Serial Controller Not Con-

nected”

The most likely cause is improper installation of the USB drivers, which causes Windows to

recognize DC1427A as an “Unknown Device.” Open the Windows Control Panel, open “System” and

click the “Device manager” tab. Open the “Other Devices” item and look for USB SERIAL

CONTROLLER. Select this item and click the remove button. Unplug DC1427, Re-install the LT Power-

play software, and follow the on-screen instructions.

Demo board software loads properly, but will not run or gives “Device Not accessible” errors.

Verify that the demo board is properly powered up. This Quick Start Guide lists the basic

power connections to DC1427. Some demo boards may have additional requirements; refer to the demo

board’s Quick Start guide for details.

Problem

ProblemProblem

Problem

Solution

Problem

ProblemProblem

Problem

Solution

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1427A

I2C/SMBUS/PMBUS CONTROLLER

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