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 pull-
ups 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.
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
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