Texas instruments Iso154 evm series User manual

User's Guide

SLLU166–June 2012

ISO154xEVM Low-Power Bidirectional I2C Isolators

Evaluation Module

Contents

1 Introduction .................................................................................................................. 2

1.1 Overview ............................................................................................................ 2

1.2 ISO154xEVM Kit Contents ........................................................................................ 2

1.3 Functional Configuration .......................................................................................... 3

1.4 EVM Schematic .................................................................................................... 4

2 EVM Setup and Operation ................................................................................................. 6

2.1 Overview ............................................................................................................ 6

2.2 Input/Output Signal Characteristics .............................................................................. 7

3 Bill of Materials .............................................................................................................. 9

4 ISO154xEVM Layout ...................................................................................................... 10

List of Figures

1 ISO1540 and ISO1541 Pinout............................................................................................. 3

2 ISO154xEVM Top Photograph............................................................................................ 3

3 ISO154xEVM Schematic................................................................................................... 4

4 Basic EVM Operation....................................................................................................... 6

5 Typical Waveforms, Inputs on Side 1 .................................................................................... 7

6 Typical Waveforms, Inputs on Side 2 .................................................................................... 8

7 ISO154xEVM Top-layer Routing ........................................................................................ 10

8 ISO154xEVM Bottom-layer Ground Planes............................................................................ 11

List of Tables

1 ISO154xEVM Description.................................................................................................. 5

2 ISO154x EVM Bill of Materials ............................................................................................ 9

SLLU166–June 2012 ISO154xEVM Low-Power Bidirectional I2C Isolators Evaluation Module

Introduction

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1 Introduction

This User’s Guide details the ISO154x Evaluation Module (EVM) operation of the factory-installed

ISO1540 and ISO1541 I2C-compatible bidirectional isolators. The EVM may be reconfigured for use with

two ISO1540 or two ISO1541 instead of one of each.

This Guide presents a typical laboratory setup used with this EVM.

CAUTION

This Evaluation Module (EVM) is made available for isolator parameter

performance evaluation only and is not intended for isolation voltage testing. To

prevent damage to the EVM, any voltage applied as a supply or digital

input/output must be maintained within the 0 V to 5.5 V recommended

operating range.

Exceeding the specified input voltage range may cause unexpected operation and irreversible damage to

the EVM. If there are questions concerning the input voltage range, contact a TI field representative prior

to connecting power.

Applying loads outside the specified output range may result in unintended operation and possible

permanent damage to the EVM. If there is uncertainty as to the load specification, contact a TI field

representative.

1.1 Overview

The ISO154x devices are low-power, bidirectional isolators that are compatible with I2C interfaces. The

logic input and output buffers on these devices are separated by TI’s Capacitive Isolation technology

utilizing a silicon dioxide (SiO2) barrier. When used in conjunction with isolated power supplies, these

devices block high voltages, isolate grounds and prevent noise currents from entering the local ground

and interfering with or damaging sensitive circuitry.

The ISO1540 has two isolated bidirectional channels for clock and data lines and is fit for multi-master

applications. The ISO1541 has a bidirectional data and a unidirectional clock channel and is useful in

applications that have a single master.

These devices achieve isolated bidirectional communication by introducing an offset, making the side 1

low-level output greater than the side 1 low-level input and thus preventing an internal logic latch that

otherwise would occur with standard digital isolators.

1.2 ISO154xEVM Kit Contents

1. ISO154xEVM Circuit Board (PWB P/N 6547206)

2. ISO154xEVM User’s Guide (SLLU166 - this document)

3. ISO154x Datasheet (SLLSEB6)

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ISO1540

GND2

SCL1

VCC2

VCC1

SCL2

Side 1

SDA1 SDA2

Isolation

ISO1541

GND2

SCL1

VCC2

VCC1

SCL2

GND1

SDA1 SDA2

Isolation

Side 2 Side 1 Side 2

GND1

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Introduction

1.3 Functional Configuration

The pinouts of ISO1540 and ISO1541 are displayed in Figure 1. These devices have an input noise-filter

that prevents transient pulses of up to 5 ns from being passed to the output of the device.

Figure 1. ISO1540 and ISO1541 Pinout

The EVM is shown in Figure 2, it comes with an ISO1540 and an ISO1541 installed in place of U1 and U2

respectively. However, this EVM can be configured for use with two ISO1540s or two ISO1541s.

Figure 2. ISO154xEVM Top Photograph

An input or output pin can be tied either to supply voltage (VCCx) or Ground (GNDx) using the 4-pin

jumpers on the EVM (J3A to J10A on side 1 and J3B to J10B on side 2). These jumpers also provide

scope-probe access to each pin.

Each signal line (SDAx, SCLx) is configured with a 1-kΩpull-up resistor (R1 to R8) to the corresponding

power supply (VCCx). Reconfigure the value of this pull-up resistor as per the application requirement.

SLLU166–June 2012 ISO154xEVM Low-Power Bidirectional I2C Isolators Evaluation Module

Introduction

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1.4 EVM Schematic

A schematic diagram for this EVM is presented in Figure 3.

Figure 3. ISO154xEVM Schematic

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Introduction

Table 1. ISO154xEVM Description

Label Description

U1 ISO154x, by default populated as ISO1540

U2 ISO154x, by default populated as ISO1541

J1 Side 1 power supply terminal block (VCC1)

J2 Side 2 power supply terminal block (VCC2)

TP15, TP47 Side 1 GND test point (GND1)

TP18, TP34 Side 2 GND test point (GND2)

TP13 VCC1 test point

TP16 VCC2 test point

J3A, J4A 4-pin jumper to VCC1, SDA1, GND1 for U1

J5A, J6A 4-pin jumper to VCC1, SCL1, GND1 for U1

J3B, J4B 4-pin jumper to VCC2, SDA2, GND2 for U1

J5B, J6B 4-pin jumper to VCC2, SCL2, GND2 for U1

J7A, J8A 4-pin jumper to VCC1, SDA1, GND1 for U2

J9A, J10A 4-pin jumper to VCC1, SCL1, GND1 for U2

J7B, J8B 4-pin jumper to VCC2, SDA2, GND2 for U2

J9B, J10B 4-pin jumper to VCC2, SCL2, GND2 for U2

C1, C2, C3, C4 1.0 µF filter capacitor

C5, C6, C7, C8 0.1 µF filter capacitor

R1, R2, R5, R6 1-kΩ0603 footprint pull-up resistor to VCC1

R3, R4, R7, R8 1-kΩ0603 footprint pull-up resistor to VCC2

SLLU166–June 2012 ISO154xEVM Low-Power Bidirectional I2C Isolators Evaluation Module

J1 J2

J3A/J4A

J5A/J6A

J3B/J4B

J5B/J6B

J7A/J8A

J9A/J10A

J7B/J8B

J9B/J10B

Power Supply

VCC1

Power Supply

VCC2

I C Transmitter

Oscilloscope I C Transmitter

Oscilloscope

EVM Setup and Operation

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2 EVM Setup and Operation

This section includes the setup and operation of the EVM for parameter performance evaluation. Typical

input and output waveforms are included.

2.1 Overview

The basic setup in Figure 4 has the two power supplies required to evaluate isolator performance with any

combination of 3.3 V or 5 V on either side. If both sides are evaluated at the same supply voltage, only

one power supply is required and can be used to power both sides of the EVM.

CAUTION

Note that this EVM is for operating parameter performance evaluation only and

not designed for isolation voltage testing. Any voltage applied above the 5.5-V

maximum recommended operating voltage of the isolators may damage the

EVM.

Please note that if the ISO1541 is used, providing an input signal on the SCL2 pin does not yield any

output on SCL1, SCL1 remains pulled up to VCC1.

Figure 4. Basic EVM Operation

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EVM Setup and Operation

2.2 Input/Output Signal Characteristics

Figure 5 illustrates SDA1 and SCL1 of U1 being treated as inputs and driven by an I2C transmitter

connected to J3A/J4A (for SDA1) and J5A/J6A (for SCL1). The output waveforms at SDA2 and SCL2 are

captured on the oscilloscope at J3B/J4B and J5B/J6B respectively. Note the step in the rising edge of the

input waveforms at SDA1 and SCL1 indicative of the tLOOP parameter of the device and demonstrating

the effect of the difference in the low levels for the side 1 output and input enabling the device to avoid a

latch-up state.

Note the tLOOP effect on the rising edge of the input waveforms on SDA1 and SCL1.

Figure 5. Typical Waveforms, Inputs on Side 1

SLLU166–June 2012 ISO154xEVM Low-Power Bidirectional I2C Isolators Evaluation Module

EVM Setup and Operation

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Figure 6 illustrates SDA2 and SCL2 of U1 being treated as inputs and driven by an I2C transmitter

connected to J3B/J4B (for SDA2) and J5B/J6B (for SCL2). The output waveforms for SDA1 and SCL1 are

captured on the oscilloscope at J3A/J4A and J5A/J6A respectively. Note the low level of the SDA1 and

SCL1 outputs offset from the ground level. This is due to the high output low level on side 1 designed to

prevent a latch-up state.

Note the offset of the output low level voltage from ground on SDA1 and SCL1.

Figure 6. Typical Waveforms, Inputs on Side 2

In addition to the cases shown here, the SDA and SCL signals also propagate in mutually opposing

directions. However, if using ISO1541, the SCL line is unidirectional and only allows the signal to

propagate from SCL1 to SCL2 and not vice-versa.

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Bill of Materials

3 Bill of Materials

The parts list for the ISO154xEVM is shown in Table 2.

Table 2. ISO154x EVM Bill of Materials

Item Qty. References Part Manufacturer

CAPACITOR, SMT, 0603, CERAMIC, 1.0 µF, 25 V, 10%,

1 4 C1,C2,C3,C4 TAIYO_YUDEN/ANY

X5R

CAPACITOR, SMT, 0603, CERAMIC, 1.0 µF, 25 V, 10%,

2 4 C5,C6,C7,C8 TAIYO_YUDEN/ANY

X5R

3 2 J1,J2 CONNECTOR, THU, TERMINAL BLOCK, 2.54 mm LS, 2P TYCO/ANY

4 8 R1,R2,R3,R4,R5,R6,R7,R8 RESISTOR, SMT, 0603, 1.0 kΩ, 0.1%, 1/10W PANASONIC/ANY

TP1,TP2,TP3,TP4,TP5,TP6,TP7,TP8,TP9,

TP10,TP11,TP12,TP13,TP14,TP15,TP16,

TP17,TP18,TP19,TP20,TP21,TP22,TP23,

TP24,TP25,TP26,TP27,TP28,TP29,TP30,

TP31,TP32,TP33,TP34,TP35,TP36,TP37,

5 70 HEADER, THU, 1P, MALE, SINGLE ROW SAMTEC/ANY

TP38,TP39,TP40,TP41,TP42,TP43, TP44,

TP45,TP46,TP47,TP48,TP49,TP50,TP51,

TP52,TP53,TP54,TP55,TP56,TP57,TP58,

TP59,TP60,TP61,TP62,TP63,TP64,TP65,

TP66,TP67,TP68,TP69,TP70

6 1 U1 IC, ISO1540, SMT, SOIC8D TI

7 1 U2 IC, ISO1541, SMT, SOIC8D TI

8 4 Rubber feet, SJ5303, Bumpon hemisphere 2M

Notes: 1. J3A on EVM silkscreen is TP30, TP63, TP33, TP32 grouped as single row 4-pin jumper.

2. J4A on EVM silkscreen is TP23, TP5, TP17, TP25 grouped as single row 4-pin jumper.

3. J5A on EVM silkscreen is TP36, TP65, TP39, TP38 grouped as single row 4-pin jumper

4. J6A on EVM silkscreen is TP27, TP6, TP20, TP24 grouped as single row 4-pin jumper.

5. J3B on EVM silkscreen is TP35, TP66, TP34, TP37 grouped as single row 4-pin jumper.

6. J4B on EVM silkscreen is TP29, TP7, TP2, TP26 grouped as single row 4-pin jumper.

7. J5B on EVM silkscreen is TP41, TP64, TP40, TP43 grouped as single row 4-pin jumper.

8. J6B on EVM silkscreen is TP31, TP8, TP4, TP28 grouped as single row 4-pin jumper

9. J7A on EVM silkscreen is TP44, TP68, TP47, TP46 grouped as single row 4-pin jumper.

10. J8A on EVM silkscreen is TP42, TP9, TP19, TP45 grouped as single row 4-pin jumper.

11. J9A on EVM silkscreen is TP49, TP69, TP51, TP50 grouped as single row 4-pin jumper.

12. J10A on EVM silkscreen is TP48, TP10, TP22, TP53 grouped as single row 4-pin jumper.

13. J7B on EVM silkscreen is TP54, TP70, TP57, TP56 grouped as single row 4-pin jumper.

14. J8B on EVM silkscreen is TP52, TP11, TP3, TP55 grouped as single row 4-pin jumper.

15. J9B on EVM silkscreen is TP61, TP67, TP60, TP62 grouped as single row 4-pin jumper.

16. J10B on EVM silkscreen is TP58, TP12, TP1, TP59 grouped as single row 4-pin jumper.

17. SJ5303 Bumpon Hemisphere: one each to be assembled at every corner of the board on the bottom side.

SLLU166–June 2012 ISO154xEVM Low-Power Bidirectional I2C Isolators Evaluation Module

ISO154xEVM Layout

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4 ISO154xEVM Layout

Figure 7 shows the top-layer routing of the ISO154xEVM.

Figure 7. ISO154xEVM Top-layer Routing

10 SLLU166–June 2012

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ISO154xEVM Layout

Figure 8 shows the bottom-layer ground planes (shaded areas).

Figure 8. ISO154xEVM Bottom-layer Ground Planes

SLLU166–June 2012 ISO154xEVM Low-Power Bidirectional I2C Isolators Evaluation Module

EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS

Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions:

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims

arising from the handling or use of the goods.

Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from

the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY 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 THE INDEMNITY SET FORTH

ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL

DAMAGES.

Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This

notice contains important safety information about temperatures and voltages. For additional information on TI's environmental and/or safety

programs, please visit www.ti.com/esh or contact TI.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or

combination in which such TI products or services might be or are used. TI currently deals with a variety of customers for products, and

therefore our arrangement with the user is not exclusive. TI assumes no liability for applications assistance, customer product design,

software performance, or infringement of patents or services described herein.

REGULATORY COMPLIANCE INFORMATION

As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal

Communications Commission (FCC) and Industry Canada (IC) rules.

For EVMs not subject to the above rules, this evaluation board/kit/module is intended for use for ENGINEERING DEVELOPMENT,

DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end product fit for general consumer

use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing

devices pursuant to part 15 of FCC or ICES-003 rules, which are designed to provide reasonable protection against radio frequency

interference. Operation of the equipment may cause interference with radio communications, in which case the user at his own expense will

be required to take whatever measures may be required to correct this interference.

General Statement for EVMs including a radio

User Power/Frequency Use Obligations: This radio is intended for development/professional use only in legally allocated frequency and

power limits. Any use of radio frequencies and/or power availability of this EVM and its development application(s) must comply with local

laws governing radio spectrum allocation and power limits for this evaluation module. It is the user’s sole responsibility to only operate this

radio in legally acceptable frequency space and within legally mandated power limitations. Any exceptions to this are strictly prohibited and

unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory

authorities, which is responsibility of user including its acceptable authorization.

For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant

Caution

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause

harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the

equipment.

FCC Interference Statement for Class A EVM devices

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules.

These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial

environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the

instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to

cause harmful interference in which case the user will be required to correct the interference at his own expense.

FCC Interference Statement for Class B EVM devices

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.

These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment

generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause

harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If

this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and

on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

For EVMs annotated as IC – INDUSTRY CANADA Compliant

This Class A or B digital apparatus complies with Canadian ICES-003.

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the

equipment.

Concerning EVMs including radio transmitters

This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this

device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired

operation of the device.

Concerning EVMs including detachable antennas

Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain

approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should

be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.

This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum

permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain

greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.

Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada.

Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de

l'utilisateur pour actionner l'équipement.

Concernant les EVMs avec appareils radio

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est

autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout

brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.

Concernant les EVMs avec antennes détachables

Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain

maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à

l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente

(p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.

Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel

d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans

cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.

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【【Important Notice for Users of this Product in Japan】】

This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan

If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product:

1. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and

Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of

Japan,

2. Use this product only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this

product, or

3. Use of this product only after you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with

respect to this product. Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note

that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan.

Texas Instruments Japan Limited

(address) 24-1, Nishi-Shinjuku 6 chome, Shinjuku-ku, Tokyo, Japan

http://www.tij.co.jp

【ご使用にあたっての注】

本開発キットは技術基準適合証明を受けておりません。

本製品のご使用に際しては、電波法遵守のため、以下のいずれかの措置を取っていただく必要がありますのでご注意ください。

1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用いただく。

2. 実験局の免許を取得後ご使用いただく。

3. 技術基準適合証明を取得後ご使用いただく。

なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。

　　　上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。

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EVALUATION BOARD/KIT/MODULE (EVM)

WARNINGS, RESTRICTIONS AND DISCLAIMERS

For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished

electrical equipment and not intended for consumer use. It is intended solely for use for preliminary feasibility evaluation in

laboratory/development environments by technically qualified electronics experts who are familiar with the dangers and application risks

associated with handling electrical mechanical components, systems and subsystems. It should not be used as all or part of a finished end

product.

Your Sole Responsibility and Risk. You acknowledge, represent and agree that:

1. You have unique knowledge concerning Federal, State and local regulatory requirements (including but not limited to Food and Drug

Administration regulations, if applicable) which relate to your products and which relate to your use (and/or that of your employees,

affiliates, contractors or designees) of the EVM for evaluation, testing and other purposes.

2. You have full and exclusive responsibility to assure the safety and compliance of your products with all such laws and other applicable

regulatory requirements, and also to assure the safety of any activities to be conducted by you and/or your employees, affiliates,

contractors or designees, using the EVM. Further, you are responsible to assure that any interfaces (electronic and/or mechanical)

between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to

minimize the risk of electrical shock hazard.

3. You will employ reasonable safeguards to ensure that your use of the EVM will not result in any property damage, injury or death, even

if the EVM should fail to perform as described or expected.

4. You will take care of proper disposal and recycling of the EVM’s electronic components and packing materials.

Certain Instructions. It is important to operate this EVM within TI’s recommended specifications and environmental considerations per the

user guidelines. Exceeding the specified EVM ratings (including but not limited to input and output voltage, current, power, and

environmental ranges) may cause property damage, personal injury or death. If there are questions concerning these ratings please contact

a TI field representative prior to connecting interface electronics including input power and intended loads. Any loads applied outside of the

specified output range may result in unintended and/or inaccurate operation and/or possible permanent damage to the EVM and/or

interface electronics. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the

load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures

greater than 60°C as long as the input and output are maintained at a normal ambient operating temperature. These components include

but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors which can be identified using the

EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during normal operation, please

be aware that these devices may be very warm to the touch. As with all electronic evaluation tools, only qualified personnel knowledgeable

in electronic measurement and diagnostics normally found in development environments should use these EVMs.

Agreement to Defend, Indemnify and Hold Harmless. You agree to defend, indemnify and hold TI, its licensors and their representatives

harmless from and against any and all claims, damages, losses, expenses, costs and liabilities (collectively, "Claims") arising out of or in

connection with any use of the EVM that is not in accordance with the terms of the agreement. This obligation shall apply whether Claims

arise under law of tort or contract or any other legal theory, and even if the EVM fails to perform as described or expected.

Safety-Critical or Life-Critical Applications. If you intend to evaluate the components for possible use in safety critical applications (such

as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, such as devices

which are classified as FDA Class III or similar classification, then you must specifically notify TI of such intent and enter into a separate

Assurance and Indemnity Agreement.

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265