Texas Instruments TCA39306 Manuale utente

User’s Guide

TCA39306 EVM User's Guide

ABSTRACT

This document covers the usage of the TCA39306 including pull up resistors, load capacitance selection, and

DUT locations for difference package options.

Table of Contents

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

2 Concept....................................................................................................................................................................................2

2.1 EVM Features.................................................................................................................................................................... 2

2.2 Adjustable pull-up resistors................................................................................................................................................ 2

2.3 Load Capacitance Selector................................................................................................................................................ 3

2.4 DUT locations.....................................................................................................................................................................4

3 Schematic................................................................................................................................................................................6

4 Bill of Material......................................................................................................................................................................... 7

5 Layout...................................................................................................................................................................................... 9

6 Revision History......................................................................................................................................................................9

Trademarks

All trademarks are the property of their respective owners.

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TCA39306 EVM User's Guide 1

1 Introduction

The TCA39306 EVM allows the user's to test the device under different loading conditions using selectable

pull-up resistors and loading capacitance. The EVM comes with U1 (DCU package) populated, but supports the

use of the DDF and DTM package. Performance should be similar to DCU package, but the user may want to

test different packages over temperature due to different temperature coefficents.

2 Concept

2.1 EVM Features

• Adjustable pull-up resistors

• Adjustable load capacitance

• Footprint available for DDF and DTM packages

2.2 Adjustable pull-up resistors

TCA39306EVM comes with adjustable pull-up resistors which allows for the user to select from a 4.7 k and 820

Ω resistor. The board itself has a 10 k pull-up resistor on the I2C bus when no resistors are selected from the

adjustable pull up bank. When 4.7 k is selected, the effective pull up resistance is 3.2 kΩ. When only the 820

Ω pull-up is selected, the effective pull up resistance is about 750 Ω. When both adjustable pull-up resistors are

selected the effective resistance is about 650 Ω. The pull-up resistor selectors are shown in Figure 2-1.

Table 2-1. Effective pull-up resistor values table

Pull-up resistor (Ω) Equivalent pull-up resistance (Ω)

10k || 4.7 k 3.2 k

10k || 820 ~750

10k || 4.7 k || 820 ~650

Figure 2-1. Adjustable pull-up resistors

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2.3 Load Capacitance Selector

Figure 2-2 shows the board with the load capacitance selectors labeled.

Figure 2-2. Load capacitor selector

The TCA39306 EVM provides a way for the designer to test the device under capacitive loading which is one

of the main constraints in an I2C system. Switches denoted as S1, S2, S3, and S4 provide the user with the

ability to change the I2C bus capacitance with up to about 525 pF of capacitance. The switched capacitor can

be selected in increments of approximately 8 pF, 1 6pF, 33 pF, 68 pF, 130 pF, and 270 pF. For example: if the

designer wants a total capacitance of 275 pF, the designer chooses to switch in 130 pF, 68 pF, 33 pF, 16 pF,

and 8 pF for a combined capacitance of approximately 255 pF, device capacitance and PCB capacitance can be

estimated to be about 20 pF resulting in approximately 275 pF.

Note that there is additional capacitance due to parasitics from the PCB line traces and ICs on the board. For

SDA and SCL pins of a device, assume 10 pF maximum per device on the I2C line. One important aspect to

remember is the TCA39306 device does not redrive an I2C signal. This means the capacitance on both sides

of the device are not separated but are technically connected (meaning they add up in parallel) when the signal

goes from LOW to HIGH from either SDA or SCL. This is highlighted because the I2C standard limits the bus

capacitance to 400 pF for standard and fast mode and 550 pF for fast mode plus. If the I2C system is expected

to exceed this amount, an I2C buffer and redriver will be necessary to separate the capacitance between the two

sides to be below the required capacitance limits.

Current I3C specifications state bus capacitance loading should be less than 50 pF, so all switches should be

turned to the off position when testing with I3C.

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TCA39306 EVM User's Guide 3

2.4 DUT locations

The TCA39306EVM comes populated with U1 as the DUT (Device Under Test) which is the TCA39306 in the

DCU package seen in the Figure 2-3. The EVM includes the DDF package and the DTM package unpopulated.

Figure 2-3. U1 location

If the user would prefer to use the DDF package, then U1 would need to be removed and U2 can then be

populated. In additional to populating U2, the resistors: R11, R12, R17, R19, R22, R20, and R23 all must be

populated with 0 Ω resistors. These resistors can be found on the back of the EVM and shown in Figure 2-4.

Figure 2-4. U2 populated

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Figure 2-5. Resistors on back of board

If the DTM package is required to be populated, U1 must be unpopulated to reveal the location of U3. Figure 2-6

shows the location of U3.

Figure 2-6. U3 Location

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TCA39306 EVM User's Guide 5

3 Schematic

Figure 3-1 illustrates the EVM schematic.

SCL1

SDA1

VREF1

EN 8

GND 1

SCL2 6

SDA2 5

VREF2 7

TCA39306DTMR

EN 8

SCL1

SDA1

VREF1

GND 1

SCL2 6

SDA2 5

VREF2 7

TCA39306DDFR

Vref1

Vref2

SCL1

SDA1

SCL2

SDA2

GND

Vref2

SCL1

SDA1

VREF1

EN 8

GND 1

SCL2 6

SDA2 5

VREF2 7

TCA39306DCUR

Vref1

SCL1

SDA1

GND

SCL2

SDA2

Vcc1

Adjustable pull up resistors

10k

R13

4.7k

R10

820

Vcc1

Adjustable pull up resistors

TP3

TP5

GND

Adjustable pull up resistors

10k

R14

4.7k

R15

820

R16

Vcc2

Adjustable pull up resistors

TP4

TP6

50V

8.2pF

50V

16pF

50V

33pF

50V

68pF

50V

130pF

50V

270pF

GND

SW3A

78B06ST

SW3B

78B06ST

SW3C

78B06ST

SW3D

78B06ST

SW3E

78B06ST

SW3F

78B06ST

GND

50V

8.2pF

C14

50V

16pF

C13

50V

33pF

C12

50V

68pF

C11

50V

130pF

C10

50V

270pF

GND

SW4A

78B06ST

SW4B

78B06ST

SW4C

78B06ST

SW4D

78B06ST

SW4E

78B06ST

SW4F

78B06ST

GND

TP2

Vcc2

TP1

Vcc1

Connectors for power supplies

Adjustable load capacitance

Additional GND connectors

J11

GND

100nF

50V

Disable Option

200k

R24

Vcc2

Vref2

100nF

50V

GND

J15

J14

R25

SCL1

SDA1

SCL2

SDA2

SCL1_Load

SDA1_Load

SCL1_Load

SCL2_Load

SDA2_Load

SCL2_Load

SDA2_Load

R18

R21

Vref1

112

SW1A

78B06ST

211

SW1B

78B06ST

310

SW1C

78B06ST

SW1D

78B06ST

SW1E

78B06ST

SW1F

78B06ST

112

SW2A

78B06ST

211

SW2B

78B06ST

310

SW2C

78B06ST

SW2D

78B06ST

SW2E

78B06ST

SW2F

78B06ST

R20 SCL2

SDA2

0R23

R19

0R22

0 ohm resistors on DDF package is used to reduce st ubbing on the PCB traces when set as DNP

R17

R11

4.7k

820

R12

50V

8.2pF

C15

50V

16pF

C16

50V

33pF

C17

50V

68pF

C18

50V

130pF

C19

50V

270pF

C20

10k

R5 4.7k

820

50V

8.2pF

C21

50V

16pF

C22

50V

33pF

C23

50V

68pF

C24

50V

130pF

C25

50V

270pF

C26

Vcc1

10k

Vcc1

1 2

3 4

1 2

3 4

Vcc2

1 2

3 4

J10

1 2

3 4

Vcc2

J13J12

Figure 3-1. TCA39306EVM Schematic

Schematic www.ti.com

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4 Bill of Material

Designator Quantity Value Description PackageReference PartNumber Manufacturer

!PCB1 1 Printed Circuit Board INT151 Any

C1, C2 2 0.1uF CAP, CERM, 0.1 uF, 50 V, +/- 10%, X7R,

AEC-Q200 Grade 1, 0805

0805 GCM21BR71H104KA37K MuRata

C3, C9, C20, C26 4 270pF CAP, CERM, 270 pF, 50 V, +/- 5%, C0G/

NP0, 0603

0603 GRM1885C1H271JA01D MuRata

C4, C10, C19, C25 4 130pF CAP, CERM, 130 pF, 50 V, +/- 5%, C0G/

NP0, 0603

0603 GRM1885C1H131JA01D MuRata

C5, C11, C18, C24 4 68pF CAP, CERM, 68 pF, 50 V, +/- 5%, C0G/

NP0, 0603

0603 06035A680JAT2A AVX

C6, C12, C17, C23 4 33pF CAP, CERM, 33 pF, 50 V, +/- 5%, C0G/

NP0, 0603

0603 06035A330JAT2A AVX

C7, C13, C16, C22 4 16pF CAP, CERM, 16 pF, 50 V, +/- 5%, C0G/

NP0, 0603

0603 GRM1885C1H160JA01D MuRata

C8, C14, C15, C21 4 8.2pF CAP, CERM, 8.2 pF, 50 V, +/- 3%, C0G/

NP0, 0603

0603 06035A8R2CAT2A AVX

H1, H2, H3, H4 4 Machine Screw, Round, #4-40 x 1/4, Nylon,

Philips panhead

Screw NY PMS 440 0025 PH B&F Fastener

Supply

H5, H6, H7, H8 4 Standoff, Hex, 0.5"L #4-40 Nylon Standoff 1902C Keystone

J1, J2, J3, J4, J7, J8 6 Header, 1x1, Tin, TH Header, 1x1 PEC01SAAN Sullins Connector

Solutions

J5, J6, J9, J10 4 Header, 100mil, 2x2, Gold, TH 2x2 Header TSW-102-07-G-D Samtec

J11, J14, J15 3 Header, 100mil, 2x1, Gold, TH Sullins 100mil, 1x2,

230 mil above

insulator

PBC02SAAN Sullins Connector

Solutions

J12, J13 2 1mm Uninsulated Shorting Plug, 10.16mm

spacing, TH

Shorting Plug,

10.16mm spacing,

D3082-05 Harwin

LBL1 1 Thermal Transfer Printable Labels, 0.650"

W x 0.200" H - 10,000 per roll

PCB Label 0.650 x

0.200 inch

THT-14-423-10 Brady

R1, R3, R9, R16 4 820 RES, 820, 5%, 0.125 W, AEC-Q200 Grade

0, 0805

0805 ERJ-6GEYJ821V Panasonic

R2, R4, R10, R15 4 4.7k RES, 4.7 k, 5%, 0.125 W, AEC-Q200

Grade 0, 0805

0805 ERJ-6GEYJ472V Panasonic

R5, R6, R13, R14 4 10k RES, 10 k, 5%, 0.125 W, AEC-Q200 Grade

0, 0805

0805 ERJ-6GEYJ103V Panasonic

R7, R8, R18, R21,

R25

5 0 RES, 0, 5%, 0.063 W, 0402 0402 MCR01MZPJ000 Rohm

R24 1 200k RES, 200 k, 5%, 0.125 W, AEC-Q200

Grade 0, 0805

0805 CRCW0805200KJNEA Vishay-Dale

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TCA39306 EVM User's Guide 7

Designator Quantity Value Description PackageReference PartNumber Manufacturer

SW1, SW2, SW3,

SW4

4 SWITCH SLIDE DIP SPST 150MA 30V SWITCH SLIDE DIP

SPST

78B06ST Grayhill Inc

TP1 1 Test Point, Multipurpose, Orange, TH Orange Multipurpose

Testpoint

5013 Keystone

TP2 1 Test Point, Multipurpose, Red, TH Red Multipurpose

Testpoint

5010 Keystone

TP3, TP4 2 Test Point, Multipurpose, Yellow, TH Yellow Multipurpose

Testpoint

5014 Keystone

TP5, TP6 2 Test Point, Multipurpose, Blue, TH Blue Multipurpose

Testpoint

5127 Keystone

U1 1 Dual Bidirectional I2C Bus and SMBus

Voltage-Level Translator

PSOP8 TCA39306DCUR Texas Instruments

FID1, FID2, FID3 0 Fiducial mark. There is nothing to buy or

mount.

N/A N/A N/A

R11, R12, R17, R19,

R20, R22, R23

0 0 RES, 0, 5%, 0.063 W, 0402 0402 MCR01MZPJ000 Rohm

U2 0 Dual Bidirectional I2C Bus and SMBus

Voltage-Level Translator

SOT23-8 TCA39306DDFR Texas Instruments

U3 0 Dual Bidirectional I2C Bus and SMBus

Voltage-Level Translator

X2SON8 TCA39306DTMR Texas Instruments

Schematic www.ti.com

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5 Layout

Figure 5-1 and Figure 5-2 show the PCB layout images.

Figure 5-1. TCA39306EVM Top Layout

Figure 5-2. TCA39306EVM Bottom Layout

6 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

DATE REVISION NOTES

June 2021 * Initial Release

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TCA39306 EVM User's Guide 9

STANDARD TERMS FOR EVALUATION MODULES

1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or

documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance

with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.

1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility

evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not

finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For

clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions

set forth herein but rather shall be subject to the applicable terms that accompany such Software

1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,

or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production

system.

2Limited Warranty and Related Remedies/Disclaimers:

2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License

Agreement.

2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM

to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by

neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have

been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications

or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control

techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.

User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)

business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.

2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit

User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty

period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or

replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be

warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day

warranty period.

WARNING

Evaluation Kits are intended solely for use by technically qualified,

professional electronics experts who are familiar with the dangers

and application risks associated with handling electrical mechanical

components, systems, and subsystems.

User shall operate the Evaluation Kit within TI’s recommended

guidelines and any applicable legal or environmental requirements

as well as reasonable and customary safeguards. Failure to set up

and/or operate the Evaluation Kit within TI’s recommended

guidelines may result in personal injury or death or property

damage. Proper set up entails following TI’s instructions for

electrical ratings of interface circuits such as input, output and

electrical loads.

NOTE:

EXPOSURE TO ELECTROSTATIC DISCHARGE (ESD) MAY CAUSE DEGREDATION OR FAILURE OF THE EVALUATION

KIT; TI RECOMMENDS STORAGE OF THE EVALUATION KIT IN A PROTECTIVE ESD BAG.

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