Flex FAB8020785/B User Manual page 12

KEP 91017 FAB8020785/B
USB-PMBus Adapter USB-PMBus Adapter
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.
User Guide
28701- FAB8020785 Rev. A
28701- KEP 91017
© Flex
© Flex
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August 2018
August 2018