NXP Semiconductors PCA9600 OM6293 Manual de usuario

UM10323

PCA9600 demonstration board OM6293

Rev. 01 — 15 December 2008 User manual

Document information

Info Content

Keywords I2C, bus buffer, twisted pair

Abstract The OM6293 is an add-on to NXP Semiconductors I2C 2005-1 demo board.

This daughter board makes it easy to test and design with the PCA9600, a

dual bidirectional bus buffer.

User manual Rev. 01 — 15 December 2008 2 of 9

Contact information

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: [email protected]

NXP Semiconductors UM10323

PCA9600 demonstration board OM6293

Revision history

Rev Date Description

01 20081215 user manual; initial release

User manual Rev. 01 — 15 December 2008 3 of 9

NXP Semiconductors UM10323

PCA9600 demonstration board OM6293

1. Introduction

The OM6293 evaluation board features RJ45 jacks for easy setup and demonstration of

the bus buffer capabilities of the PCA9600. It can be easily connected to other boards with

off-the-shelf telephone or networking twisted pair wires.

The IC communicates to the host via the I2C-bus/SMBus port and extends the buses’

capacitive handling, increases the current handling, extends the range, and/or allows

I2C-bus signaling via differential bus hardware.

2. Features

•A complete evaluation platform for the PCA9600

•Easy to integrate daughter card

•Convenient test point for easy scope measurements and signal access

3. Getting started

3.1 Assumptions

Familiarity with the I2C-bus is recommended. It is also recommended that the user read

Application Note AN10658, which covers other design considerations such as timing

delays, maximum data transmission speeds, handling ground potential differences and

designing for extreme ESD requirements.

3.2 Static handling requirements

3.3 System requirements

The OM6293 daughter card can be used with the Windows based OM6275 I2C 2005-1

demo board, the microcontroller-based OM6299 industrial reference design board, or

stand-alone in the user’s application.

3.4 Power supply

When connected to the OM6275 I2C 2005-1 demo board or the OM6299 industrial

reference design board, the OM6293 can draw power from the host board through the

5 V pin on connector 3 (CON3).

An external power supply can also be used to power the board at location J1. The external

power supply can range from 2.5 V to 15 V.

CAUTION

This device is sensitive to ElectroStatic Discharge (ESD). Therefore care should be taken

during transport and handling. You must use a ground strap or touch the PC case or other

grounded source before unpacking or handling the hardware.

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PCA9600 demonstration board OM6293

4. Schematic

Fig 1. OM6293 PCA9600 evaluation board

VCC

GND

002aae284

5 V

2.7 kΩ

n.c.

CON4

5 V

VCC

IC1

PCA9600

GND

CON3

GND

VCC

100 nF

Axial

VCC

BZX84C15

BAT54A

D3A

Axial

VCC

Axial

VCC

BZX84C15

1 kΩ

BAT54A

D3B

R10

1 kΩ

150R

VCC

150R

VCC

CON1

CON2

VCC

User manual Rev. 01 — 15 December 2008 5 of 9

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PCA9600 demonstration board OM6293

5. Bill of materials

Fig 2. OM6293 fitted to the 9-pin header on OM6275 I2C 2005-1

Table 1. Bill of materials

Part type Designator Footprint Description

2.54 mm 4×2 way header J2 4×2 way 2.54 mm PIN HEADER Test point connector

Molex 22-28-6270 CON4 9 way 2.54 mm PIN HEADER 9-pin connector

Molex 22-15-2096 CON3 9 way 2.54 mm PIN SOCKET 9-pin socket

R8 R0805 SMD resistor

R4 R0805 SMD resistor

Multicomp 7005-8P8C CON2 RJ-45 8TH RJ-45 8 way connector

Multicomp 7005-8P8C CON1 RJ-45 8TH RJ-45 8 way connector

1kΩR10 R0805 SMD resistor

1kΩR6 R0805 SMD resistor

2.7 kΩR1 R0805 SMD resistor

2.7 kΩR2 R0805 SMD resistor

100 nF C1 C0805 SMD capacitor

150R R9 R0805 SMD resistor

150R R5 R0805 SMD resistor

R7 AXIAL VR25(0.4) user installed leaded resistor

R3 AXIAL VR25(0.4) user installed leaded resistor

D1 DIODE SOD57 (0.5) user installed leaded Zener diode

D4 DIODE SOD57 (0.5) user installed leaded Zener diode

BAT54A D3A SOT23 Schottky diode

BAT54A D3B SOT23 Schottky diode

BZX84C15 D5 SOT23 user installed SMD Zener diode

User manual Rev. 01 — 15 December 2008 6 of 9

NXP Semiconductors UM10323

PCA9600 demonstration board OM6293

6. Using the OM6293 with the I2C 2005-1 demo board

The board can be easily configured to demonstrate two common applications:

•Generating an Fm+ compatible drive signal for other application boards, and

•Driving long Cat5e communication cables in ‘4-signal’ mode using two daughter

boards.

6.1 Generating an Fm+ compatible drive signal

A single daughter board is fitted to the 9-pin expansion header of the I2C 2005-1

evaluation board and can be powered from the switched 5 V supply on that board.

The I2C 2005-1 evaluation board’s 9-pin header signals are duplicated on the daughter

board’s 9-pin header CON4 to allow further expansion or connection of other daughter

cards.

The P82B96/PCA9600 generates Fm+ signals on the 8P8C modular (RJ45) jack CON1

that are compatible with, for example, the PCA9633 LED Demo Board Fm+ signals. To

select this option, it is necessary to close switches 1 and 2 on the DIP switch S1 and to

open switches 3 and 4. (The RJ45 jack CON2 should not be used.)

The 5 V power selection jumper should be fitted between pins 2 and 3 on header J1.

The input signals from the I2C 2005-1 evaluation board and the corresponding Fm+

signals as delivered to the RJ45 jack CON1 are available for probing on the 8-pin header

J2.

For further details on this setup, refer to the Application Note AN10658, section 3.1.

6.2 Driving long Cat5e cables in 4-signal mode

One board is fitted to the 9-pin expansion header of the I2C 2005-1 evaluation board and

can be powered from the switched 5 V supply of that board by fitting the jumper between

pins 2 and 3 on header J1.

The board is configured for driving long Cat5e cables by opening switches 1 and 2 on the

DIP switch S1 and closing the switches 3 and 4. The cable to be driven, fitted with

standard 8P8C modular connectors (RJ45), is fitted into the RJ45 jack CON1.The other

end of the cable is fitted into the RJ45 jack CON2 of a second or ‘remote’

P82B96/PCA9600 daughter board. This ‘remote’ board will derive its 5 V supply from the

first board, via the cable and CON2. Use of CON2, with its different wiring configuration,

provides the necessary crossover linking from Tx on one board to Rx on the other.

BZX84C15 D2 SOT23 user installed SMD Zener diode

2.54 mm 3 way header J1 3 way 2.54 mm PIN STRIP supply selector header

PCA9600 IC1 SO8 dual bidirectional bus buffer

OMRON A6T-4104 S1 DIP8 DIP switch

Table 1. Bill of materials …continued

Part type Designator Footprint Description

User manual Rev. 01 — 15 December 2008 7 of 9

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PCA9600 demonstration board OM6293

Ensure that the 5 V power selection jumper is fitted between pins 2 and 3 on header J1 or

that some alternative logic supply voltage is connected to pin 2 on J1 so that there is a

supply voltage for the I2C-bus on the Sx/Sy side of this ‘remote’ board. The cable bus

signals will be converted back to conventional I2C-bus levels by the ‘remote’

P82B96/PCA9600 and both the cable bus and I2C-bus signals are available for probing on

the 8-pin header J2. They are also available on the 9-pin header CON4 in the same

format as on the I2C 2005-1 expansion header.

Note that only the ‘switched 5 V’ supply from the I2C 2005-1 board is used on

CON1/CON2. The un-switched 5 V and 3.3 V supplies are not available on the Cat5e

cable and therefore are not available on CON4 in modes where boards are linked only by

the Cat5e cable.

For further details on this setup, refer to Application Note AN10658, section 3.2.

7. Abbreviations

8. References

[1] AN10658, Sending I2C-bus signals via long communications cables —

NXP Semiconductors; application note;

www.nxp.com/acrobat/applicationnotes/AN10658

[2] PCA9600, Dual bidirectional bus buffer — NXP Semiconductors;

Product data sheet; www.nxp.com/pip/PCA9600

Table 2. Abbreviations

Acronym Description

DIP Dual In-line Package

ESD ElectroStatic Discharge

Fm+ Fast-mode Plus

I2C-bus Inter-Integrated Circuit bus

IC Integrated Circuit

LED Light-Emitting Diode

PC Personal Computer

SMBus System Management Bus

SMD Surface Mount Device

User manual Rev. 01 — 15 December 2008 8 of 9

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PCA9600 demonstration board OM6293

9. Legal information

9.1 Definitions

Draft — The document is a draft version only. The content is still under

internal review and subject to formal approval, which may result in

modifications or additions. NXP Semiconductors does not give any

representations or warranties as to the accuracy or completeness of

information included herein and shall have no liability for the consequences of

use of such information.

9.2 Disclaimers

General — Information in this document is believed to be accurate and

reliable. However, NXP Semiconductors does not give any representations or

warranties, expressed or implied, as to the accuracy or completeness of such

information and shall have no liability for the consequences of use of such

information.

Right to make changes — NXP Semiconductors reserves the right to make

changes to information published in this document, including without

limitation specifications and product descriptions, at any time and without

notice. This document supersedes and replaces all information supplied prior

to the publication hereof.

Suitability for use — NXP Semiconductors products are not designed,

authorized or warranted to be suitable for use in medical, military, aircraft,

space or life support equipment, nor in applications where failure or

malfunction of an NXP Semiconductors product can reasonably be expected

to result in personal injury, death or severe property or environmental

damage. NXP Semiconductors accepts no liability for inclusion and/or use of

NXP Semiconductors products in such equipment or applications and

therefore such inclusion and/or use is at the customer’s own risk.

Applications — Applications that are described herein for any of these

products are for illustrative purposes only. NXP Semiconductors makes no

representation or warranty that such applications will be suitable for the

specified use without further testing or modification.

9.3 Trademarks

Notice: All referenced brands, product names, service names and trademarks

are the property of their respective owners.

I2C-bus — logo is a trademark of NXP B.V.

NXP Semiconductors UM10323

PCA9600 demonstration board OM6293

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: salesaddre[email protected]

Date of release: 15 December 2008

Document identifier: UM10323_1

Please be aware that important notices concerning this document and the product(s)

described herein, have been included in section ‘Legal information’.

10. Contents

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3.1 Assumptions. . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3.2 Static handling requirements . . . . . . . . . . . . . . 3

3.3 System requirements . . . . . . . . . . . . . . . . . . . . 3

3.4 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . 3

4 Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

5 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . 5

6 Using the OM6293 with the I2C 2005-1

demo board . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

6.1 Generating an Fm+ compatible drive signal. . . 6

6.2 Driving long Cat5e cables in 4-signal mode . . . 6

7 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . 7

8 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

9 Legal information. . . . . . . . . . . . . . . . . . . . . . . . 8

9.1 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

9.2 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

9.3 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

10 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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