Page 1
KEP 91017
USB-PMBus Adapter
28701- KEP 91017
August 2018
© Flex
User Guide
KEP 91017
USB-PMBus Adapter
28701- KEP 91017 Rev. A
August 2018
© Flex
User Guide
USB-PMBus Adapter
KEP 91017
User Guide
Page 2
KEP 91017
USB-PMBus Adapter
28701- KEP 91017
August 2018
© Flex
User Guide
2
KEP 91017
USB-PMBus Adapter
28701- KEP 91017 Rev. A
August 2018
© Flex
User Guide
2
Copyright
© Flex 2018. All rights reserved
Disclaimer
No part of this document may be reproduced in any form without the written
permission of the copyright owner.
The contents of this document are subject to revision without notice due to
continued progress in methodology, design and manufacturing. Flex shall have no
liability for any error or damage of any kind resulting from the use of this
document.
Trademarks
All trademarks are properties of their owners.
Flex is the trademark of Flextronics International, LTD.
PMBus™ is a trademark of SMIF, Inc.
Windows® and Microsoft® are the trademarks of Microsoft Corporation in the
United States or other countries.
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KEP 91017
USB-PMBus Adapter
28701- KEP 91017
August 2018
© Flex
User Guide
3
KEP 91017
USB-PMBus Adapter
28701- KEP 91017 Rev. A
August 2018
© Flex
User Guide
3
Contents
1 Introduc
tion .......................................................................................... 4
1.1 How to contact Flex ............................................................................... 4
1.2 Information about cautions and warnings ............................................... 4
2 Product overview ................................................................................. 6
2.1 Computer system and software requirements ........................................ 7
3 Connecting the USB-PMBus adapter ................................................. 7
4 Electrical specification ........................................................................ 8
5 Mechanical information ..................................................................... 10
6 Step-by-step instructions for operation and troubleshooting ........ 10
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KEP 91017
USB-PMBus Adapter
28701- KEP 91017
August 2018
© Flex
User Guide
4
KEP 91017
USB-PMBus Adapter
28701- KEP 91017 Rev. A
August 2018
© Flex
User Guide
4
1 Introduction
This Product serves as an interface adapter or a bridge between a host PC
(IBM™ compatible) and one or multiple PMBus design/evaluation boards via a
standard type-A to mini-B USB cable. The communication between the USBPMBus adapter and the host PC is via USB, while the communication between
the USB-PMBus adapter and PMBus design/evaluation board(s) is via an interintegrated circuit (I2C) and/or general-purpose inputs/outputs GPIOs. The bridge
converts communication transactions between the USB and PMBus.
1.1 How to contact Flex
For general questions or interest in our products, please contact your local sales
representative. Contact details are found on our website:
www.flex.com/powermodules
1.2 Information about cautions and warnings
The information in a caution or a warning is provided for your protection. Please
read each caution and warning carefully.
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KEP 91017
USB-PMBus Adapter
28701- KEP 91017
August 2018
© Flex
User Guide
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KEP 91017
USB-PMBus Adapter
28701- KEP 91017 Rev. A
August 2018
© Flex
User Guide
5
Attention!
Observe precautions
electrostatic sensitive device
By default, the PMBus data and clock lines are pulled up internally to 3.3 V. If an
external ones are used, please make sure to pull up to 3.3V only. Operation from
5V is not specified and may permanently damage this USB-PMBus adapter.
This equipment is intended for use in a laboratory test environment only. It
generates, uses, and can radiate radio frequency energy and has not been tested
for compliance with the limits of computing devices pursuant to subpart J of part
15 of FCC rules, which are designed to provide reasonable protection against
radio frequency interference. Operation of this equipment in other environments
may cause interference with radio communications, in which case, the user, at
his/her own expense, will be required to take whatever measures may be required
to correct this interference.
Page 6
USB-PMBus
Standard type-A
USB cable
KEP 91017
USB-PMBus Adapter
28701- KEP 91017
August 2018
© Flex
User Guide
6
KEP 91017
USB-PMBus Adapter
28701- KEP 91017 Rev. A
August 2018
© Flex
User Guide
6
2 Product overview
In order to operate this USB interface adapter, the following items are required.
Ensure you have received all parts shown below.
to type B (5pin)
10-ribbon cable
with connectors
on both ends
adapter
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KEP 91017
USB-PMBus Adapter
28701- KEP 91017
August 2018
© Flex
User Guide
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KEP 91017
USB-PMBus Adapter
28701- KEP 91017 Rev. A
August 2018
© Flex
User Guide
7
2.1 Computer system and software requirements
System requirements:
• Pentium 1GHz or better processor
• At least 512 MB of RAM
• 10 MB of available hard-disk space
• USB 1.0 port or higher
Supported operating system:
• Windows XP Pro SP2 and later 32-bit Windows version
The following software environment is required:
• Windows Installer 3.1 or later
3 Connecting the USB-PMBus adapter
In the figure below it is shown how to connect the USB-PMbus adapter to, for
example, Flex’s POL design board (ROA 128 3836 R2A). The 10-pin ribbon cable
is connected to the board. The USB shall be connected to one USB port of your
PC.
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KEP 91017
USB-PMBus Adapter
28701- KEP 91017
August 2018
© Flex
User Guide
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KEP 91017
USB-PMBus Adapter
28701- KEP 91017 Rev. A
August 2018
© Flex
User Guide
8
4 Electrical specification
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KEP 91017
USB-PMBus Adapter
28701- KEP 91017
August 2018
© Flex
User Guide
9
KEP 91017
USB-PMBus Adapter
28701- KEP 91017 Rev. A
August 2018
© Flex
User Guide
9
The addition of external pull-up resistors between the data/clock lines and the
nominal PMBus/I2C voltage is shown in the figure below.
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KEP 91017
USB-PMBus Adapter
28701- KEP 91017
August 2018
© Flex
User Guide
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KEP 91017
USB-PMBus Adapter
28701- KEP 91017 Rev. A
August 2018
© Flex
User Guide
10
5 Mechanical information
The pinout of the board connector of the PMBus cable is shown in the figure
below.
NC NC V
CTRL SCL
I2C
NC NC DGND SALERT SDA
6 Step-by-step instructions for operation and
troubleshooting
Below you find short instructions for operation and troubleshooting:
1. Plug in the USB cable to both the PC and the USB -PMBus adapter and wait
for the green LED to illuminate. Troubleshooting: If the green LED does not
illuminate after 30 s, check to ensure the USB cable is securely connected. If
the connection is secure, try a different USB port. If a different USB port does
not solve the problem, try to reboot the computer. If rebooting the computer
does not fix the problem, try a different USB cable.
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KEP 91017
USB-PMBus Adapter
28701- KEP 91017
August 2018
© Flex
User Guide
11
KEP 91017
USB-PMBus Adapter
28701- KEP 91017 Rev. A
August 2018
© Flex
User Guide
11
2. Plug in the 10-pin ribbon cable to both the USB-PMBus adapter and a design
board (for example ROA 128 3835 or ROA 128 3836). Make sure that the
notch on the ribbon-cable connector matches the keyhole of the socket in the
enclosure.
3. Power up the design board. Note that the default I2Cspeed is set at 100 kHz
and the default pullups for PMBus data (SDA) and clock lines (SCL) are set at
2.2 kΩ.
Further instructions for troubleshooting:
If the design board cannot talk with the USB-PMBus adapter, first check to ensure
the 10-pin ribbon cable has been securely connected. If the ribbon cable has
been securely connected, check the PM-Bus communication speed and the pullups for data (SDA) and clock (SCL) lines suitable for the application. If not, modify
the PMBus communication speed and the pull-ups accordingly. If this still does
not solve the problem, contact your local Flex representative.
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