NXP Semiconductors PCA9600 OM6293 User manual

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.

UM10323_1 © NXP B.V. 2008. All rights reserved.
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

UM10323_1 © NXP B.V. 2008. All rights reserved.
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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UM10323_1 © NXP B.V. 2008. All rights reserved. User manual Rev. 01 — 15 December 2008 4 of 9 NXP Semiconductors UM10323
PCA9600 demonstration board OM6293
4. Schematic
Fig 1. OM6293 PCA9600 evaluation board
9
VCC
Sy
Ry
Ty
J2
Sx
Rx
Tx
GND
1
2
3
4
8
7
6
5
002aae284
1 2 3 4 5 6 7
8
5 V
R1
2.7 kΩ
R2
2.7 kΩ
1 2 3
n.c.
CON4
J1
5 V VCC
VCC
IC1
PCA9600
Sx
Rx
Sy
Tx
Ty
GND
Ry
8
1
7
4
3
2
5
6
9
1 2 3 4 5 6 7
8
CON3
Sx
Sy
GND
VCC
VCC
C1
100 nF
D1
Axial
R3
Axial
VCC
1
2
R4
VCC
Rx
Tx
Ty
Ry
BZX84C15
D2
BAT54A
D3A
R7
Axial
VCC
D4
Axial
R8
VCC
D5
BZX84C15
R6
1 kΩ
BAT54A
D3B
R10
1 kΩ
R5
150R
VCC
R9
150R
VCC
3
4
1
2
3
4
5
6
7
8
CON1
1
2
3
4
5
6
7
8
CON2
VCC
VCC

UM10323_1 © NXP B.V. 2008. All rights reserved.
User manual Rev. 01 — 15 December 2008 5 of 9
NXP Semiconductors UM10323
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

UM10323_1 © NXP B.V. 2008. All rights reserved.
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

UM10323_1 © NXP B.V. 2008. All rights reserved.
User manual Rev. 01 — 15 December 2008 7 of 9
NXP Semiconductors UM10323
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

UM10323_1 © NXP B.V. 2008. All rights reserved.
User manual Rev. 01 — 15 December 2008 8 of 9
NXP Semiconductors UM10323
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
© NXP B.V. 2008. All rights reserved.
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