DC1880A - LINEAR TECHNOLOGY

dc1880af

DEMO MANUAL DC1880A

Description

LTC2874

Quad IO-Link Master

Hot Swap Controller and PHY

Demonstration circuit 1880A showcases the LTC

2874, a

quad Hot Swap™ controller and PHY suitable for IO-Link

master and other applications. DC1880A operates from

an external supply VDD and utilizes the DC590 USB serial

controller board to communicate with the LTC2874 using

SPI protocol.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot

Swap, QuikEval and Linduino are trademarks of Linear Technology Corporation. IO-Link is

a registered trademark of PROFIBUS User Organization (PNO). All other trademarks are the

property of their respective owners.

performance summary

Design files for this circuit board are available at

http://www.linear.com/demo/DC1880A

Specifications are at TA = 25°C, VDD = 24V, and VL = 3.3V.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VDD Input Supply Range 24VMODE = 0

24VMODE = 1 8

20 30

30 V

ΔVACL L+ Analog Current Limit Voltage ΔVACL = VSENSE+ – VSENSE–

VL+ = 0V, FLDBK_MODE = 1

VL+ = VDD – 1V

Start-Up, 2XPTC Enabled, VL+ > 18V

9.2

16.7

100

24.2

ΔVGATE External N-Channel Gate Drive

(VGATE – VL+)IGATE = –1µA

VDD = 17V to 30V

VDD = 8V

4.5

VRQH,

VRQL

CQ Residual Voltage Output High, ICQ = –100mA

Output Low, ICQ = 100mA 1.2

1.1 1.6

1.5 V

IQPKH,

IQPKL

Wake-Up Request (WURQ) Current ±500 ±700 mA

IQH, IQL CQ Current Limit ±110 ±160 ±230 mA

fDTR Maximum Data Transfer Rate fDTR = 4nF

SLEW = 0

SLEW = 1

38.4

230.4

kb/s

tWU WURQ Pulse Duration 75 80 85 µs

SCK Frequency 50% Duty Cycle 20 MHz

dc1880af

DEMO MANUAL DC1880A

Quick start proceDure

Figure 1. Proper Setup

dc1880af

DEMO MANUAL DC1880A

Quick start proceDure

DC1880A is a 6-layer demonstration board. An LDO is

included to optionally derive the VL logic supply from

the VDD input supply. An LED lights up when the IRQ pin

signals interrupt requests.

1. Install, or update as needed, Linear Technology's

QuikEval™ evaluation software on the PC. See Using

the LTC2874 Software section for more information.

2. Connect the DC590 board to the PC with a standard

USB A/B cable.

3. Connect the DC1880A board to the DC590 board using

the 14-conductor ribbon cable supplied with the DC590

board.

4. Choose the source for the VL logic supply—the DC590,

the LDO on the DC1880A, or either if both are set to

the same voltage:

a. Set the DC1880A LDO jumpers (JP11 and JP12) and

DC590 VCCIO jumper (JP6) to one of the combina-

tions listed in Table 1. Default jumper positions set

both boards to 5V.

b. When using a Linduino™ One instead of a DC590

board, set the DC1880A LDO to 5V (JP11 = 5.0V)

or disable it (JP12 = OPEN).

5. Before connecting the input power supply to the

DC1880A board, verify the voltage is below 40V

(normally between 8V and 30V) and that the supply

is turned off.

6. Connect the power supply between VDD and GND on

the DC1880A board as shown in Figure 1.

7. Connect line interface cables (up to 20m long) to either

the screw-terminal blocks (J1-J4) or the IO-Link con-

nectors (J5-J8).

8. Turn on the 24V power supply and verify that the IRQ

LED on the DC1880A board is lit. (The LTC2874 is

signalling that one or more of its supplies had been

low.)

9. Launch the GUI software. Refer to the Using the

LTC2874 Software section for more information on

how to control the LTC2874 using the GUI.

10. Clear the IRQ condition by clearing any Supply Event

bits that are set. On the Events tab, simply click on any

lamps that are lit.

11. Refer to the Additional Information section and the

data sheet for operating details.

dc1880af

DEMO MANUAL DC1880A

aDDitional information

VL Logic Supply

Table 1 lists several ways to supply power to the VL pin.

Methods 1a/b/c are recommended for most purposes.

Table 1. Recommended Options for Powering the VL Supply

METHOD

DC590

JP6

DC1880A

JP12

DC1880A

JP11

SOURCE FOR

VL POWER

5V*

3.3V

OPEN (2.7V)

ON*

5V*

3.3V

OPEN (2.9V)

LDO or DC590

2 EXT ON* X** LDO

3 EXT OPEN X** DC1880A VL TURRET

4 5V* or 3.3V OPEN X** DC590

* (Default)

** Including OPEN (2.9V)

L+ Power Supply Outputs

Enable the L+ power supply outputs by setting their

respective EN_L+ register bits high.

CQ Line Driver Outputs

Enable the CQ line drivers either by input pin (using the

TXEN turrets and/or jumpers JP1/3/7/9) or via the SPI

interface (by setting DRVEN register bits high). See Table 2.

Table 2. CQ Driver Mode Configuration

JP1/3/7/9

SETTING

TXEN

TURRET

DRVEN

BIT

CQ DRIVER

MODE

GND

EXT

L/H

OFF

OFF/ON

Control the output CQ states using the TXD turrets and/

or jumpers JP2/4/8/10. See Table 3.

Table 3. CQ Driver Output Level Configuration

JP2/4/8/10

SETTING

TXD

TURRET

DRVEN

BIT

CQ DRIVER

MODE*

LEVEL

GND

GND/VL

EXT

DB9

L/H

H/L**

OFF

H/L

* From Table 2

** RS232 transceiver U2 inverts

Alternatively, operate the CQ drivers solely via the SPI

interface by tying TXD low and controlling the DRVEN

switching at or below COM2 data rates (38.4kb/s).

TVS Protection

The CQ and L+ pins are protected by 36V TVS diodes for

cable-driving applications.

Serial Port

A DB9 connector enables CQ data to be sent (for one or

more ports) and received (for one port) using PC software

such as a serial terminal program. Jumper JP5 enables

the required RS-232 transceiver.

Select the desired combination of drivers by setting one

or more of JP2/4/8/10 to the DB9 position. Select one CQ

receiver using JP6.

L+ Isolation

If L+ isolation is not needed, Schottky diodes D1-D4 may

be replaced with 0Ω resistors.

Interrupts

The LTC2874 includes an open-drain interrupt line for

signaling the host controller when it needs service. This

signal is accessible on the DC1880A board at the IRQ test

point. An LED is also included for convenience.

dc1880af

DEMO MANUAL DC1880A

aDDitional information

Jumpers

JP1/3/7/9: Port 4/3/2/1 CQ Driver Enables. See Table 2.

Default position VL.

JP2/4/8/10: Port 4/3/2/1 Data Input to CQ Driver. See

Table 3. Default position GND.

JP6: RXDn COM Port Select. Determines which receiver

output (RXD1/2/3/4, if any) is connected to the serial port.

Default position RXD1.

JP5: COM PORT Enable. Connects RS232 transceiver U2

to VL logic supply. Default position ON.

JP11: VL Select. Programs LDO voltage to 2.9V (OPEN),

3.3V, 5V, or 5.5V. Default position 5V.

JP12: LDO On. Enables LDO which derives VL logic sup-

ply from VDD supply voltage input. Default position ON.

JP13: GND Shield. Shorts shields of J5-8 to GND. Default

position OPEN.

dc1880af

DEMO MANUAL DC1880A

using the Dc1880a software

Introduction

Linear Technology’s QuikEval software provides a quick

and easy way to evaluate most aspects of LTC2874 opera-

tion. It operates a SPI interface that reads or writes from

the 14 onboard registers via a DC590 serial controller.

Install QuikEval BEFORE connecting the DC1880A to the

USB port of the PC. Download and run the installation

program from http://www.linear.com/software and follow

the onscreen instructions. The LTC2874 GUI will launch

automatically when the PC begins communicating with

the DC1880A via the serial controller. Thereafter, start

the GUI by running QuikEval from:

C:\Program Files\LTC\QuikEval\quikeval.exe

If the QuikEval software was installed previously, update

it to the latest version using Tools > Update Program.

The LTC2874 GUI is composed of a main window having

three tabs, and a Register Map window. The Ports tab

(Figure 2) contains controls and monitors that are unique to

each individual port. The Timers and Globals tab (Figure 3)

contains controls and monitors that are common to all

ports. The Events tab (Figure 4) provides access to event

monitoring registers. The Register Map window (Figure 5)

provides access to all register bits via an alternate format.

The LTC2874 GUI begins communicating with the DC1880A

automatically. Once running, it continuously polls the

LTC2874 registers to monitor status.

Connect/Disconnect Button

The Disconnect button disables the SPI interface and most

of the GUI. The Connect button restarts SPI polling and

activates the complete GUI.

Reset Button

This button issues a SPI Reset command, returning all

registers to default values.

Events Tab

This tab contains lamps that map to Event Register bits.

A lamp that is on indicates that the corresponding bit in

the LTC2874 Event Register has been set. Clicking on a

lamp will clear the Event bit if the condition no longer

persists. Event Register behavior is sticky, meaning each

lamp stays on until cleared.

The check boxes control which events will cause IRQ to

signal.

This window presents all register bits in an alternate format.

Change register values directly by clicking on individual

bits, using arrow widgets, or by entering numeric values.

Changed bits appear yellow until either committed to the

LTC2874 by pressing the Write and Update button, or

cleared by pressing the Discard Unwritten Changes button.

The Save Current Values button saves the LTC2874 register

values to a text file. The Load Saved Values button loads

the register values from one such file into the Register Map

window. (Write and Update will then configure LTC2874

accordingly.)

Running QuikEval GUI Using Linduino One

The QuikEval GUI software for DC1880A may be operated

using a Linduino One (DC2026) with the DC590 emulator

sketch in place of the DC590. When using this USB-isolated

Arduino-compatible demonstration board, set the DC1880A

LDO to 5V (JP11=5.0V) or disable it (JP12=OPEN).

dc1880af

DEMO MANUAL DC1880A

using the Dc1880a software

Figure 2. Main Window, Ports Tab

dc1880af

DEMO MANUAL DC1880A

using the Dc1880a software

Figure 3. Main Window, Timers and Globals Tab

dc1880af

DEMO MANUAL DC1880A

using the Dc1880a software

Figure 4. Main Window, Events Tab

Figure 5. Register Map Window

dc1880af

DEMO MANUAL DC1880A

troubleshooting guiDe

1. Problem: LTC2874 program doesn't download and

install automatically.

Solution: Get the latest QuikEval software either by

updating QuikEval from its pull-down menu (Tools >

Update Program), or by installing the latest version

directly from: www.linear.com/software.

2. Problem: DC590 controller board not detected.

(Error 1)

Solution: Connect to PC using USB A/B cable.

3. Problem: LTC2874 not detected. (Error 2)

Solution: Ensure that the DC590 ribbon cable is con-

nected and that VL power is applied. See Table 1.

4. Problem: Unsuccessful communication with the

LTC2874. (Error 5)

Solution: Check DC590 ribbon and USB connections.

Usually, this error indicates that one was disconnected

while the program was running.

5. Problem: Invalid value read from the LTC2874.

(Error 6)

Solution: Ensure VL supply power is applied correctly.

Referring to Table 1, check LDO jumper on the DC1880A

and JP6 on the DC590.

6. Problem: GUI is gray-colored and inactive.

Solution: Press Connect button.

dc1880af

DEMO MANUAL DC1880A

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP, 1µF 20%, 16V, X7R, 0603 TDK, C1608X7R1C105M

2 1 C2 CAP, 1µF 10%, 50V, X7R, 0805 MURATA, GRM21BR71H105KA12L

3 1 C9 CAP, ALUMINUM, 100µF, 20%, 63V UCC, EMZA630ADA101MJA0G

4 8 D5-12* DIODE, TVS, 36V, SMA STM, SM6T36A

5 4 Q1-4 TRANSISTOR, NFET, SOT-223 FAIRCHILD, FQT7N10TF

6 4 R1-4 RES, 10Ω,1%, 0603 AAC, CR16-10R0FM

7 4 R25-28 RES, 0.2Ω, 1%, 0805 SUSUMO, RL1220S-R20-F

8 1 U1 IC, QUAD IO-LINK MASTER HOT SWAP CONTROLLER

AND PHY LINEAR TECH, LTC2874IFE

Additional Demo Board Circuit Components

1 3 C3,C4,C6 CAP, 1µF, 20%, 16V X7R, 0603 TDK, C1608X7R1C105M

2 1 C5 CAP, 0.22µF, 10%, 16V X7R, 0603 TDK, C1608X7R1C224K

3 1 C7 CAP, 0.1µF, 10%, 25V X7R, 0603 TDK, C1608X7R1E104K

4 1 C8 CAP, TANTALUM, 4.7µF, 20%, 7343 50V AVX, TAJD475K050R

5 0 C10-21 OPTIONAL

6 4 D1-4** DIODE, SCHOTTKY, 1A, 100V FAIRCHILD, S100

7 1 D13 LED, RED PANASONIC, LN1251C

8 1 L1 INDUCTOR, 10µH, 0.5Ω, 0.3A, 0806 TAIYO-YUDEN, CBC2016T100M

9 9 R5-12, R24 RES, 100, 5%, 1206 AAC, CR18-101JM

10 1 R22 RES, 4.99k, 1%, 0603 AAC, CR16-4991FM

11 3 R13-15 RES, 4.99k, 1%, 0603 AAC, CR16-4991FM

12 1 R16 RES, 100k, 1%, 0603 AAC, CR16-1003FM

13 1 R17 RES, 75k, 1%, 0603 VISHAY, CRCW060375K0FKEA

14 1 R18 RES, 10k, 1%, 0603 AAC, CR16-1002FM

15 1 R19 RES, 309k, 1%, 0603 VISHAY, CRCW0603309KFKEA

16 1 R20 RES, 59k, 1%, 0603 AAC, CR16-5902FM

17 1 R21 RES, 47.5k, 1%, 0603 AAC, CR16-4752FM

18 1 R23 RES, 680, 1%, 0603 AAC, CR16-681FM

19 0 R29-32 OPTIONAL

20 1 U2 IC, RS232 TRANSCEIVER LINEAR TECH, LTC2802CDE

21 1 U3 IC, LDO LINEAR TECH, LT3012EFE

22 1 U4 IC, SERIAL EEPROM 2k MICROCHIP, 24LC025-I/ST

Hardware for Demo Board Only

1 12 E1-6, E8-13 TURRET MILL-MAX, 2308-2-00-80-00-00-07-0

2 6 E7, E14-18 TURRET MILL-MAX, 2501-2-00-80-00-00-07-0

3 4 J1-4 TERMINAL BLOCK, 5 POSITION, 3.5mm, HEADER WÜRTH, 691321100005

4 4 J1-4 TERMINAL BLOCK, 5 POSITION, 3.5mm, PLUG WÜRTH, 691361100005

5 1 J5 JACK, M12, 5 POSITION, FEMALE, STRAIGHT BINDER, 09-3442-500-05

6 0 J6-8 OPTIONAL

7 1 J9 CONNECTOR, DSUB, 9 PIN FEMALE SIGNATRON, DR-E9SB-NJ-001

* TVS diodes are recommended for cable-driving applications.

** Substitute 0Ω resistors if diodes not desired.

dc1880af

DEMO MANUAL DC1880A

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

8 2 J10-11 JACK, BANANA KEYSTONE, 575-4

9 1 J12 HEADER, 2×7 2mm MOLEX, 87831-1420

10 5 JP1, JP3, JP7, JP9, JP11 HEADER, 2×3 2mm SAMTEC, TMM-103-02-L-D

11 5 JP2, JP4, JP6, JP8, JP10 HEADER, 2×4 2mm SAMTEC, TMM-104-02-L-D

12 2 JP5, JP12 HEADER, 1×2 2mm SAMTEC, TMM-102-02-L-S

13 12 JP1-12 SHUNT, 2mm SAMTEC, 2SN-BK-G

14 1 JP13 HEADER, 1×2 0.1" SAMTEC, TSW-101-07-G-D

15 1 JP13 SHUNT, 0.1" SAMTEC, SNT-100-BK-G

16 4 STANDOFF, SNAP-ON KEYSTONE, 8833

dc1880af

DEMO MANUAL DC1880A

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

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0603.

ALL CAPACITORS ARE IN MICROFARADS, 0603.

TXEN4 1

GATE4 2

SENSE-4 3

CQ4 5

L+4 4

GATE3 7

CQ3 6

SENSE-3 8

L+3 9

SENSE+ 10

VDD 11

GATE2 12

SENSE-2 13

L+2 14

CQ2 15

CQ1 16

GATE1 17

SENSE-1 18

L+1 19

RXD1

20 TXD1

21 TXEN1

22 IRQ

23 SDO

24 RXD2

25 TXD2

26 TXEN2

27 VL

28 GND

29 GND

30 SDI

31 SCK

32 CS

33 RXD3

34 TXD3

35 TXEN3

36 RXD4

37 TXD4

LTC2874IFE

A B C DE FG H

A BC DE F G H

I J KL

TITLE: SCHEMATIC

SIZE IC NO. REV.

DATE: SHEET OF

APPROVALS

SCALE = NONE

CUSTOMER NOTICE

Monday, October 28, 2013

QUAD INDUSTRIAL BUS MASTER CONTROLLER

KEITH B.

LTC2874IFE

DEMO CIRCUIT 1880A

ECO REV APPROVED DATE

REVISION HISTORY

DESCRIPTION

1630 McCarthy Blvd.

Milpitas, CA 95035

Phone: (408) 432-1900

Fax: (408) 434-0507

www.linear.com

LTC CONFIDENTIAL

FOR CUSTOMER

USE ONLY

THIS CIRCUIT IS PROPRIETARY TO

LINEAR TECHNOLOGY AND SUPPLIED FOR

USE WITH LINEAR TECHNOLOGY PARTS.

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT

TO DESIGN A CIRCUIT THAT MEETS CUSTOMER -

SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS

THE CUSTOMERS RESPONSIBILITY TO VERIFY

PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND

PRINTED CIRCUIT LAYOUT MAY SIGNIFICANTLY

AFFECT CIRCUIT PERFORMANCE OR RELIABILITY.

CONTACT LINEAR TECHNOLOGY APPLICATIONS

ENGINEERING FOR ASSISTANCE.

TECHNOLOGY

PCB DES.

APP ENG. KEITH B.

-2 1ST PROTOTYPE KEITH B. 9-17-12

N/A

J10

VDD

8V - 30V

LINE OUT

FQT7N10

R27

0.2 0805

FQT7N10

R25

0.2 0805

FQT7N10

R26

0.2 0805

FQT7N10

R28

0.2 0805

J11

GND

1413

J12

DC590

IRQ

SDO

SDI

SCK

E14

2.9V - 5.5V

E15

GND

E16

VDD

100

1206

EXT

GND

TXEN3

R12

100

1206

EXT

GND

JP10

TXD1

DB9

100

1206

EXT

GND

TXEN4

100

1206

EXT

GND

TXEN2

R11

100

1206

EXT

GND

E11

TXEN1

E12

TXD1

R10

100

1206

EXT

GND

JP8

TXD2

DB9

TXD2

100

1206

EXT

GND

JP4

TXD3

DB9

TXD3

100

1206

EXT

GND

JP2

TXD4

DB9

TXD4

R23

680

D13

IRQ

RED

R22

4.99k

JP9

TXEN1

JP7

TXEN2

JP3

TXEN3

JP1

TXEN4

DCD

DSR

GND

RTS

CTS

DTR

TXn

JP6

TXn

R24

100

1206

E13

RXD1

E10

RXD2

RXD3

RXD4

1uF/50V

0805

1uF/16V C4

1uF/16V

10uH

220nF/16V

RIN

1TOUT

VCC 3

VDD

GND 6

CAP

VL 10

MODE 9

PS 8

TIN 11

ROUT 12

VEE

LTC2802

4.7uF/16V

3528

100uF/63V

DIA=12.5mm

LINE IN

36V

D10

36V

D12

36V

SCL 6

SDA 5

WP 7

1A1

2A2

VCC 8

VSS

24LC025

R15 4.99k

R14 4.99k

R13 4.99k

0.1uF/25V

GND

VL VL VL

TXn

RXD4

RXD3

RXD2

RXD1

SDO

SDI SCK

L+1

I/Q1

L-1

C/Q1

NC1

L+2

I/Q2

L-2

C/Q2

NC2

L+3

I/Q3

L-3

C/Q3

NC3

L+4

I/Q4

L-4

C/Q4

NC4

E18

GND

E17

GND

C18

OPEN

C19

OPEN

C20

OPEN

C21

OPEN

C10

OPEN

C11

OPEN

C12

OPEN

C13

OPEN

C14

OPEN

C15

OPEN

C16

OPEN

C17

OPEN

R29

OPEN

R30

OPEN

R31

OPEN

R32

OPEN

I/Q1

L+1

NC1

C/Q1

L-1

JP13

GND - SHIELD

I/Q2

L+2

NC2

C/Q2

L-2

I/Q3

L+3

NC3

C/Q3

L-3

I/Q4

L+4

NC4

C/Q4

L-4

RXDn

SELECT

COM PORT

(DB9)

JP5

COM PORT

ENABLE

1uF/16V

IN 13

SHDN 11

OUT

ADJ

GND

LT3012

JP12

LDO

R18

10k

R16

100k

R17

75k

JP11

SELECT

R20

59k

R21

47.5k

R19

309k

2.9V

3.3V

5.0V

5.5V

36V

D11

36V

S100

IRQ

dc1880af

DEMO MANUAL DC1880A

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 1213 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C) 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 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035